JP2007138305A - Coated paper for printing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coated paper for printing, having a high ash content yield on papermaking even on highly blending a filler, showing less decrease in paper strength irrespective to the highly blended filler or high bulkiness of the paper, generating less blister or paper powder on offset-printing, excellent in traveling property, further showing less strike through and excellent in printed surface quality. <P>SOLUTION: This coated paper for printing, installed with a coated layer containing a pigment and binder on a stock paper is characterized by containing a filler obtained by surface-treating inorganic particles having 0.1-30 μm with a cationic compound and starch other than the cationic compound in the stock paper and having 5-40 solid portion wt.% ratio of the filler in the stock paper. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention has a high filler yield at the time of papermaking, and in particular, printing on an offset printing machine has no trouble of paper dust or delamination (blister), and has excellent printing running properties, and further has excellent printing surface quality with little show-through. It relates to industrial paper.

  In recent years, from the viewpoint of increasing environmental protection awareness and paper manufacturing cost reduction, in order to reduce the amount of pulp used, the blending and bulking of fillers for printing paper used in offset printing machines has progressed. It's getting on. However, in the high-filler paper, the pulp content is reduced and the increase in the inhibition of the inter-fiber binding by the filler, and in the bulk paper, the inter-fiber binding of the pulp is weakened due to the lower density. The interlaminar strength and surface strength of the paper may be reduced, which may cause quality problems.

In addition, the coated paper for printing has a very low ash yield at the time of papermaking due to the high speed of the paper machine and double-sided dewatering in addition to high filler and high waste paper pulp blending. The most important quality is that it can withstand use in an offset printing press, and the requirements for blister resistance and paper dust accompanying the decrease in interlayer strength and surface strength are extremely severe. Recently, in addition to the quality related to running performance, there is a demand for a phenomenon in which an image printed on one side of paper can be seen through from the opposite side, that is, so-called show-through, and the required level is increasing year by year. It is high.

  It is known that increasing the opacity of the paper is most effective in improving the printing surface of the coated paper for printing and reducing the back-through. As a method for increasing the opacity of paper, it is effective to increase the ash content in the paper by blending a filler having a high specific scattering coefficient and a large effect of increasing opacity. The increase in the filler content in the paper significantly reduces the yield of the filler during papermaking, making stable operation difficult, increasing the amount of paper dust generated in the offset printing press due to higher fillers, and drying the ink by heat. There are problems such as increased blister troubles in the heat-set offset rotary press that dries.

  Also, paper bulking agents have attracted attention as a technology for reducing the density of paper. Most of these bulking agents for paper are designed to reduce the density of the paper by interposing between the pulp fibers and inhibiting the interfiber bonding of the pulp. Although the use of paper can reduce the density of the paper, there is a problem that the interlaminar strength is lowered.

  In general, as a method for increasing the interlaminar strength of a coated paper for printing with a papermaking chemical, a method of internally adding a paper strength enhancer such as polyacrylamide or starch is used. However, in order to obtain a sufficient strength, an addition amount more than usual is required, which tends to cause deterioration of the formation of the paper, which may lower the interlayer strength. In addition, it is considered that adding these chemicals having cohesiveness and adhesiveness to the papermaking process may cause unstable operation, and that adding chemicals is difficult from the viewpoint of cost.

  There is known a method for providing an effect obtained by adding and mixing chemicals to inorganic particles such as calcium carbonate, silica, titanium oxide, and clay. For example, a method for producing calcium carbonate that does not dissolve even in acidic papermaking by mixing fatty acid with calcium carbonate (see Patent Document 1), and calcium carbonate that does not dissolve in acidic papermaking by mixing oxalic acid or stearic acid with calcium carbonate. A method for producing (see Patent Document 2), a method for improving sizing by mixing a cationic polymer as a sizing agent with calcium carbonate (see Patent Document 3), and 0.1% to 1% anionic property in an inorganic filler A method of improving sizing by mixing a substance and a cationic polymer that is a sizing agent of 0.1% to 10% (see Patent Document 4), and improving sizing by mixing fatty acid and starch in calcium carbonate A method (see Patent Document 5), a method for improving sizing by mixing a fatty acid with calcium carbonate or titanium oxide (see Patent Document 6), calcium carbonate A method of reducing friction coefficient by mixing long chain aliphatic amines with pigments, silica, kaolin, etc. (see Patent Document 7), and a method of improving sizing by mixing acrylonitrile copolymer with calcium carbonate ( Patent Document 8), and a method (see Patent Document 9) used as a drainage / retention aid by mixing polyvinylamine with calcium carbonate or bentonite. However, these methods are intended to stabilize calcium carbonate when acidic, improve size, and change the friction coefficient, and are not methods for improving interlayer strength.

  On the other hand, as a technique for improving the paper strength by adding chemicals to inorganic particles, a method of mixing carboxymethyl cellulose or xanthan gum with calcium carbonate (see Patent Document 10), starch powder is mixed with the inorganic particle slurry. Although a method of heating and gelling to make a composite (see Non-Patent Document 1) has been disclosed, it is still insufficient in terms of cost, effect, and practicality, and a more effective paper strength and stiffness improvement method is available. It has been demanded.

U.S. Patent No. 1839449 JP 59-228098 U.S. Pat.No. 5,147,507 Japanese National Patent Publication No. 10-505883 U.S. Pat.No. 5,541,212 Japanese National Patent Publication No. 08-507837 JP-T 09-504057 Special Table 2002-520504 Japanese Patent Laid-Open No. 08-188983 JP-T 09-5066397 Yulin Zhao et.al., Tappi Journal, 3,40 (2), 2005. As mentioned above, even if a high amount of filler is added, the yield of the filler during papermaking is high, and the filler is highly compounded and the bulk of the paper is increased. Nevertheless, there is little decrease in interlayer strength and surface strength, high filler yield at the time of papermaking, less blistering and paper dust generation especially during offset printing, and there is little back-through and excellent printing surface quality. Development was desired.

  The problem to be solved by the present invention is that, even when the filler is blended in a high amount, the yield of the filler during papermaking is high, and the decrease in interlayer strength and surface strength is small despite the high blending of the filler and the bulk of the paper. In particular, an object of the present invention is to provide a coated paper for printing which has less delamination and paper dust generation during offset printing, and further has high opacity and little show-through, and excellent quality.

  In the coated paper for printing in which the base paper is provided with a coating layer containing a pigment and an adhesive, inorganic particles having an average particle size of 0.1 to 30 μm are surface-treated using a starch other than the cationic compound and the cationic compound. It is possible to obtain a coated paper for printing containing a filler and having a filler content of 5 to 40% by solid weight in the base paper. In addition, in a method for producing a coated paper in which a base paper obtained by making a paper mainly composed of pulp and filler is coated with a coating liquid containing a pigment and an adhesive, an inorganic material having an average particle size of 0.1 to 30 μm For printing, characterized in that a mixed slurry consisting of particles, a cationic compound, and starch paste is added to the stock as a filler to make a paper, and a base paper with a filler content in the paper of 5 to 40% solids by weight is used. This is a production method for obtaining coated paper.

In general, an interaction such as hydrogen bonding does not work between the inorganic particles and the pulp fibers, and the inorganic particles interposed between the pulp fibers inhibit the hydrogen bonding between the pulp fibers as a filler. For this reason, the greater the amount of inorganic particles internally added to the paper, the lower the interlayer strength and surface strength. However, in the present invention, the following remarkable effects can be obtained by internally adding a filler slurry comprising inorganic particles, a cationic compound, and a starch paste solution to paper stock to make a coated paper for printing.
(1) By mixing inorganic particles, a cationic compound, and starch paste liquid, a composite in which these inorganic particles are used as a core and the surface thereof is coated with a complex of a cationic compound and starch can be obtained. When this paper is added internally, it becomes easy to be fixed to the pulp fiber as a filler by the action of the complex of the cationic compound and starch, so that the filler yield on the wire is improved.
(2) In addition, the amount of cationic compounds and starch in the paper increases, and inorganic particles coated with the complex of cationic compounds and starch can be bonded to pulp fibers, thereby increasing the blending of fillers. In spite of the increase in the bulk of the coated paper for printing due to, for example, the internal use of a bulking agent for paper, there is little decrease in paper strength and rigidity. The printing coated paper containing inorganic particles coated with the complex of the cationic compound and starch of the present invention in the base paper is obtained by making paper by adding inorganic particles, cationic compound and starch paste separately to pulp. Also, the interlayer strength and the surface strength are remarkably improved.
(3) By improving the interlayer strength and surface strength, the blister resistance can be improved and the amount of paper dust generated can be suppressed when using an offset printing press.
(4) By adding a composite of inorganic particles as the core and the surface of which is coated with a complex of a cationic compound and starch, it is possible to increase the filler content in paper while suppressing a decrease in interlayer strength and surface strength. It becomes possible and opacity is improved.

  In the present invention, a filler slurry comprising inorganic particles having an average particle size of 0.1 to 30 μm, a cationic compound, and a starch paste is added to the paper material, and a base paper having a filler content in the paper of 5 to 40% by solid weight is made into paper. Then, a coating liquid containing a pigment and an adhesive is applied onto the base paper to obtain a coated paper for printing.

  Inorganic particles having an average particle size of 0.1 to 30 μm used in the present invention are clay, calcined kaolin, deramikaolin, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, heavy calcium carbonate, light calcium carbonate, magnesium carbonate , Barium carbonate, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, etc., as long as they are conventionally used as fillers for papers or pigments for coated papers, there is no limitation. More than one type can be used in combination. Among these, heavy calcium carbonate and light calcium carbonate are preferable. That is, the neutral papermaking method is suitable as the papermaking method.

  The cationic compound used in the present invention includes cationized starch, polyamine epichlorohydrin, polyamide epichlorohydrin, polyvinylamine, a homopolymer of diallyldimethylammonium chloride, a copolymer of diallyldimethylammonium chloride and acrylamide, polyethyleneimine , Selected from the group of polyaluminum chloride and sulfuric acid band. These are used in the form of aqueous solutions or emulsions. These 1 type, or 2 or more types of mixed liquids can be used. The raw material of the cationized starch is not limited, and raw material starches such as corn, waxy maize, tapioca, sweet potato, potato, wheat and rice can be used. The cationic group may be a tertiary amine group or a quaternary ammonium group, and the degree of substitution (D.S.) is not limited.

  The starch paste used in the present invention is selected from the group of oxidized starch, urea-phosphorylated starch, hydroxyethylated starch, amphoteric starch, acetylated starch, and raw starch, and one or more of these are selected. A mixed paste can be used. The raw materials for these starches are not limited, and starches such as corn, waxy maize, tapioca, sweet potato, potato, wheat, rice, etc. can be used. Further, there is no limitation on the degree of substitution of these ether groups and ester groups.

In the present invention, a filler slurry is prepared by mixing inorganic particles having an average particle size of 0.1 μm to 30 μm, a cationic compound, and starch paste under stirring. The order of addition of the inorganic particles, the cationic compound, and the starch paste at the time of mixing is not particularly limited, and for example, the following various addition orders can be employed.
(1) Add 1) the slurry of inorganic particles in the order of 2) an aqueous solution or emulsion of a cationic compound, and 3) starch paste.
(2) 1) Add to the slurry of inorganic particles in the order of 2) starch paste and 3) cationic compound.
(3) 1) Add to aqueous solution or emulsion of cationic compound in order of 2) slurry or powder of inorganic particles, 3) starch paste.
(4) Add 1) an aqueous solution or emulsion of a cationic compound in the following order: 2) starch paste, 3) slurry or powder of inorganic particles.
(5) Add 1) a slurry or powder of inorganic particles and 3) an aqueous solution or emulsion of a cationic compound to the starch paste solution in this order.
(6) To 1) the inorganic particle slurry, 2) an aqueous solution or emulsion of a cationic compound and a starch paste solution mixed in advance.
(7) Add 1) slurry or powder of inorganic particles in the order of 1) an aqueous solution or emulsion of a cationic compound and a starch paste solution.

  The mixing ratio of the inorganic particles, the cationic compound, and the starch paste is a solid weight ratio, and is in the range of inorganic particles / cationic compound / starch = 100 / 0.1 / 0.1 to 100/100/100, preferably 100 / 0.1 /0.1 to 100/50/100, more preferably 100 / 0.1 / 1 to 100/10/50. When the addition amount of the cationic compound and / or starch is less than 0.1% by weight, the effect of improving the yield of the filler is small, and further, the effect of improving the paper strength and the rigidity cannot be obtained. Since the effect reaches its peak, it is uneconomical.

  The apparatus for preparing the filler slurry by mixing the inorganic particles, the cationic compound, and the starch paste solution is not particularly limited as long as it can sufficiently stir and mix these. Mixing is between several minutes to several tens of minutes. The solid content concentration of the slurry at the time of mixing is not particularly limited, but is preferably 80% by weight or less, more preferably 70% by weight or less. The mixing temperature is preferably 10 to 50 ° C.

  The filler slurry obtained by mixing the inorganic particles, the cationic compound, and the starch paste liquid may be temporarily stored and then added to the paper material, or may be added continuously immediately after mixing. The addition place should just be a place where the filler is normally added, and it adds between a mixer and a head box.

  In paper machines, white water dehydrated in wire parts is being collected and reused in paper machines with the aim of saving water and heat energy. If present, the slime will propagate using this as a nutrient source, the slime layer adhering to the white water wall surface will fall off and be incorporated into the paper, resulting in paper defects such as foreign matter, and this may cause paper breaks during paper making May cause problems. In the present invention, since a large amount of starch is used for the treatment of inorganic particles, it is also considered that a problem of slime reproduction occurs. In order to avoid this, it is desirable to remove as much as possible the cationic compound and starch paste that are not firmly adsorbed on the inorganic particles, and the prepared filler slurry comprising the inorganic particles, the cationic compound, and the starch paste is filtered or filtered. The separated water can be separated by centrifugation, and the separated water can be drained out of the paper machine system, and the resulting dewatered cake can be redispersed in water, and then this dispersed slurry can be added to the paper stock.

  The content of the inorganic particles in which the cationic compound and starch are mixed in the paper is in the range of 5 to 40 solids by weight, preferably 10 to 35 solids, and more preferably 10 to 30 solids. When the solid content is less than 5% by weight, the amount of inorganic particles that hinder hydrogen bonding between pulp fibers is small, so that paper having high paper strength and rigidity can be obtained without coating treatment as in the present invention. Therefore, even if the mixed slurry comprising the inorganic particles, the cationic compound, and the starch paste of the present invention is added as a filler, the effect of improving the paper strength and rigidity of the present invention is small. On the other hand, if it exceeds 40% by weight, the effects of improving the paper strength, rigidity and opacity of the present invention can be obtained, but there is a problem that papermaking itself becomes difficult.

  The inorganic particles treated with the cationic compound and starch paste are added to the paper stock and incorporated into the paper to obtain a coated paper base for printing. The composition ratio of the inorganic particles present in the base paper is inorganic. Particle / cationic compound / starch = 100 / 0.05 / 0.05 to 100/90/90, and its presence can be easily confirmed by analyzing the composition of the inorganic particles in the base paper. As a method for separating the inorganic particle / cationic compound / starch composition from the paper, for example, after separating the base paper in a solvent that does not dissolve the cationic compound and starch, centrifugal separation is performed to separate the specific gravity between the pulp and the inorganic particles. The method of separating based on the above can be mentioned. The inorganic particles separated from the base paper by such a method adsorb the cationic compound and starch. By quantifying the amount of inorganic particles, cationic compound and starch in the separated inorganic particles, the inorganic particles / The composition ratio of the cationic compound / starch can be determined. The method for quantifying the inorganic particles, the cationic compound, or the starch may be any method that allows quantification with high accuracy, and a known quantification method may be employed.

  The raw material pulp used in the present invention may be any pulp that is usually used as a base paper for printing coated paper, and is not particularly limited. Chemical pulp (CP), groundwood pulp (GP), chemiground pulp (CGP) ), Refiner ground pulp (RGP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), pulp of various production methods such as semi-chemical pulp (SCP), and these softwood, hardwood pulp, or bleach, It is a pulp in which unbleached pulp and further deinked pulp (DIP) and the like are appropriately blended according to the type of paper.

  If necessary, known internal sizing agents such as alkyl ketene dimer (AKD) sizing agents, alkenyl succinic anhydride (ASA) sizing agents, and neutral rosin sizing agents can be used.

  When making base paper for coated paper for printing, internal additives for papermaking such as various nonionic and cationic retention agents, freeness improvers, paper strength improvers, etc., are used as necessary. It is appropriately selected and used. Further, for example, sulfuric acid bands, aluminum chloride, sodium aluminate, basic aluminum compounds such as basic aluminum chloride and basic polyaluminum hydroxide, water-soluble aluminum compounds such as water-degradable alumina sol, sulfuric acid A polyvalent metal compound such as ferrous sulfate or ferric sulfate, silica sol, or the like may be internally added. Other starches for papermaking, various starches, polyacrylamide, urea resin, melamine resin, epoxy resin, polyamide resin, polyamide, polyamine resin, polyamine, polyethyleneimine, vegetable gum, polyvinyl alcohol, latex, polyethylene oxide, hydrophilic cross-linked polymer Various compounds such as particle dispersions and derivatives or modified products thereof can be used. Furthermore, internal additives for papermaking such as dyes, fluorescent brighteners, pH adjusters, antifoaming agents, pitch control agents, slime control agents and the like can be appropriately added depending on the intended use.

  In recent years, a technology for increasing the bulk (lowering density) of paper by adding a bulking agent for paper has been developed. Most of these bulking agents reduce the interlaminar strength of the paper, and when the present invention is applied to a bulky paper containing such a bulking agent and increasing delamination, the effect of improvement is great.

  The coated paper for printing containing the paper bulking agent in the base paper will be described. The bulking agent is internally added to the stock. Specific examples of this bulking agent include oil-based nonionic surfactants, sugar alcohol-based nonionic surfactants, sugar-based nonionic surfactants, polyhydric alcohol-type nonionic surfactants, polyhydric alcohols and Fatty acid ester compound, higher alcohol or polyoxyalkylene adduct of higher fatty acid, polyoxyalkylene adduct of higher fatty acid ester, polyoxyalkylene adduct of polyhydric alcohol and fatty acid ester compound, fatty acid polyamidoamine, linear fatty acid Examples include monoamides and unsaturated fatty acid diamidoamines.

  This bulking agent is exemplified in the patent literature as follows. Paper bulking agent described in Japanese Patent No. 3128248, paper bulking agent described in Japanese Patent No. 3453505, paper bulking agent described in Japanese Patent No. 3482336, paper bulking agent described in Japanese Patent No. 3576962, Patent No. No. 3482337, a paper bulking agent described in Japanese Patent No. 2971447, a paper making paper quality improving agent described in Japanese Patent No. 3283248, a drying efficiency improving agent described in Japanese Patent No. 3338333, and a Japanese Patent No. 3387036. Smoothness and air permeability improver described in Japanese Patent No. 3517200, additive for papermaking described in Japanese Patent No. 3517200, paper quality improver described in Japanese Patent Laid-Open No. 2001-248100, and paper quality improvement described in Japanese Patent Laid-Open No. 2003-336196 Agent, paper quality improver described in JP 2004-52216 A, paper quality improver described in JP 2004-107865 A, paper quality improver described in JP 2004-91950 A, JP 2005-60921 A The powdery papermaking composition described in the above, the papermaking drug particles described in JP2005-68633, and the paper non-use paper described in JP2000-273792A. A clarifying agent, an additive for recycling used paper described in JP-A-2002-129497, an additive for recycling used paper described in JP-A-2002-275786, an additive for recycling used paper described in JP-A-2002-294586, A bulking agent described in JP-A-2002-294594, a bulking agent for paper described in JP-A-2003-96692, a bulking agent described in JP-A-2003-96693, and an additive for recycling used paper described in JP-A-2003-96694 Used paper recycling additive described in JP-A-2003-96695, paper thickness improving agent described in JP-A-2003-171897, bulking agent for paper described in JP-A-2003-247197, JP-A-2003-253588 Paper bulking agent described in JP-A-2003-253589, paper bulking agent described in JP-A-2003-253590, paper bulking agent disclosed in JP-A-2003-253590, paper density-increasing agent described in JP-A-2003-328297 Paper densifying agents described in JP-A-2003-313799, paper-making additives described in JP-A-2004-11058, paper-density reducing agents described in JP-A-2004-27401, JP-A 2004 -115935 for paper Agent, paper bulking agent described in JP-A-2004-76244, paper modifier described in JP-A-2004-176213, paper additive described in JP-A-2004-308095, JP-A-2005- No. 42278, a bulking agent described in JP-A-2005-42279, a bulking agent for papermaking described in JP-A-2005-60891, a paper softening agent described in Japanese Patent No. 3521422, JP-A-2002 -275792, bulky sizing agent described in JP 2002-275792, paper bulk sizing agent described in JP 2003-286692, paper manufacture described in JP 2004-270074 Bulking agent composition for paper, Bulking agent for papermaking described in JP-A-2004-285490, Bulking agent for paper described in JP-A-2004-339629, Bulking agent described in JP-A-2005-54330, JP-A-2005- A bulking agent described in Japanese Patent No. 68592.

  The bulking agent for paper referred to in the present invention is a general term for compounds having both a hydrophobic group and a hydrophilic group in a molecule, which can reduce the density of paper when paper is added internally to the stock. . In addition to the bulking agent as described in the above-mentioned patent document, the papermaking paper quality improver, drying efficiency improver, smoothness and air permeability improver, papermaking additive, paper quality improver, paper opacifier, waste paper recycling Additives, paper thickness improvers, paper densifying agents, paper modifiers, paper softening agents, bulky softening agents, papermaking bulky sizing agents, and the like.

  The bulking agent is usually added in the range of 0.2 to 20% by solid weight with respect to the raw material pulp. If the solid content is less than 0.2% by weight, the effect of reducing the density is small, and even if added in excess of 20% by solid weight, the bulky effect reaches its peak, so there is no meaning and the cost cannot be put into practical use.

  The bulking agent is preferably added after the raw material mixer and before the addition of the mixed slurry composed of the inorganic particles of the present invention, the cationic compound, and the starch paste, and other fillers.

  The paper machine type that produces the base paper is preferably an on-top former or a gap former that has a double-side dewatering mechanism in order to suppress the two-sided nature of the paper, but is not limited thereto. The paper can be appropriately made with a long net paper machine, a twin wire machine, a Yankee paper machine or the like. The press line pressure is used within the normal operating range. The calendar may be bypassed or processed within the normal operating range.

  Moreover, in this invention, before providing a coating layer on a base paper, in order to suppress permeation to the base paper of a coating layer, you may apply a surface treating agent.

  The type of surface treatment agent to be used is not particularly limited, but for example, raw starch, oxidized starch, esterified starch, cationized starch, enzyme-modified starch, aldehyde-modified starch, hydroxyethylated starch and other modified starches, Cellulose derivatives such as carboxymethylcellulose, hydroxyethylcellulose, methylcellulose, modified alcohols such as polyvinyl alcohol and carboxyl-modified polyvinyl alcohol, styrene butadiene copolymer, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride , Polyacrylic acid ester, polyacrylamide and the like can be used alone or in combination. Among them, it is preferable to apply hydroxyethylated starch which is excellent in surface strength improvement effect. Among hydroxyethylated starches, after hydroxyethylation reaction of starch, in a solid state with a moisture content of 5 to 17%, hydrogen chloride gas, More preferred is a dry low molecular weight hydroxyethylated starch which has been reduced in molecular weight by acid treatment with hydrochloric acid, sulfuric acid or the like, or oxidation treatment with ammonium persulfate, hydrogen peroxide, chlorine gas or the like. In addition to the above-mentioned agents, surface sizing agents such as styrene acrylic acid, styrene maleic acid, olefinic compounds, and cationic sizing agents can be applied to the surface treatment agent.

  In addition to the surface paper strength improver, a common surface sizing agent such as styrene acrylic acid, styrene maleic acid, or olefinic compound can be applied to the surface treatment agent.

  When a surface treatment agent comprising a surface paper strength improver and a surface sizing agent is applied to a base paper for printing, the mixing ratio of the surface paper strength improver and the surface sizing agent may be within a known range, particularly There is no limitation.

  The apparatus for applying the surface coating agent to the base paper for printing is not particularly limited, and a film transfer type such as a shim sizer or a gate roll size press is preferable.

  In the present invention, a coating layer mainly composed of a pigment and an adhesive is provided on the base paper obtained by the above method. As the pigment used in the coating layer, those conventionally used as coating pigments for paper can be used. The types of these pigments include inorganic pigments such as clay, kaolin, heavy calcium carbonate, light calcium carbonate, talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicate, colloidal silica, and satin white. And organic pigments such as plastic pigments. These pigments can be used alone or in combination of two or more as required.

  The adhesive used in the present invention is conventionally used for coated paper, such as styrene / butadiene, styrene / acrylic, ethylene / vinyl acetate, butadiene / methyl methacrylate, vinyl acetate / butyl acrylate, and the like. Synthetic adhesives such as various copolymers, polyvinyl alcohol, maleic anhydride copolymer, acrylic acid / methyl methacrylate copolymer, casein, soy protein, synthetic protein and other proteins, oxidized starch, cationized starch, One or more kinds of starches such as urea phosphate esterified starch and hydroxyethyl etherified starch, cellulose derivatives such as carboxymethyl cellulose, hydroxymethyl cellulose, and hydroxyethyl cellulose can be appropriately selected and used. These adhesives are preferably used in the range of 5 to 35 parts by weight with respect to 100 parts by weight of the pigment. When the amount exceeds 35 parts by weight, the viscosity of the coating becomes high, and disadvantages such as the problem of operability such as difficulty in passing through piping and a screen occur, which is not preferable. On the other hand, when the amount is less than 5 parts by weight, a sufficient surface strength cannot be obtained, which is not preferable.

  In the coating liquid of the present invention, various commonly used auxiliaries such as dispersants, thickeners, water retention agents, antifoaming agents, water resistance agents, dyes and fluorescent dyes can be used as auxiliaries.

In the present invention, the method for applying the adjusted coating liquid to the base paper is not particularly limited, and a known coating apparatus can be used. Examples thereof include a blade coater, a bar coater, a roll coater, an air knife coater, a reverse roll coater, a curtain coater size press coater, and a gate roll coater. Using these, one or more layers are coated on one or both sides of the base paper. Preferably the coating weight of the single-sided Atari is ^{3g / m 2 ~25g / m 2} , more preferably ^{5g / m 2 ~15g / m 2} . When the coating amount on one side is less than 3 g / m ² , sufficient base paper coverage cannot be obtained, and the ink deposition property is inferior.

  As a method for drying the wet coating layer, for example, usual methods such as a steam heater, a gas heater, an infrared heater, an electric heater, a hot air heater, a microwave, and a cylinder dryer are used.

  After drying, the coated paper for printing in the present invention can be given smoothness by a finishing process such as super calendering or high temperature soft calendering, which is post-processing, as necessary.

The density of the coated paper for printing obtained in the present invention may be in the range of 0.4 to 1.3 g / m ² , and is particularly suitable as a coated paper for offset printing. For coated paper for gravure printing and letterpress printing It can also be used as a coated paper.

  Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to these examples. In the examples, “%” and “part” indicate solid weight% and solid weight part, respectively.

The physical properties of the surface-treated inorganic particles and the physical properties of paper in the following examples and comparative examples were measured by the following methods.
(1) Average particle size: After treating the average particle size of the surface-treated inorganic particles and untreated inorganic particles with an ultrasonic disperser for 5 minutes, a laser scattering particle size measuring device Mastersizer 2000 (manufactured by MARVERN) was used. Measured.
(2) Zeta potential: The zeta potential of surface-treated inorganic particles and untreated inorganic particles was measured using ZETASIZER3000HAS (manufactured by MALVERN).
(3) Filler yield: The amount of filler in the paper was calculated from the basis weight and ash content of the paper, and was calculated from the ratio to the charged amount of filler.
(4) Starch yield: The amount of starch in paper was measured using Biosensor BF-2 (manufactured by KS Systems) and calculated from the ratio to the amount of starch charged.
(5) Evaluation method of blister, paper dust amount, and back-through: Using an offset rotary press (Toshiba B2T-600), 880mm width winding is performed at double speed color printing at 600rpm. Ten thousand copies were printed, and the number of blister occurrences per 100 copies was measured. Further, the blanket deposited paper powder was visually evaluated. See-through was evaluated in three stages of ◎ (excellent), ○ (good), and × (defect) by visually observing the four-color solid surface from the back side when printing 20,000 copies.
[Example 1]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. Fast VFH (manufactured by BASF) Add 10 parts of aqueous solution, and further add 100 parts of 2% unprocessed corn starch (manufactured by Nippon Food Processing Co., Ltd.) as starch paste solution and stir at room temperature for 10 minutes to make a filler slurry And a mixed composition which was a composite obtained by surface-treating the filler was obtained. A sulfuric acid band was added to a pulp slurry containing 75% LKP and 25% NKP as raw pulp, and 0.8% by weight of pulp and 15% by weight of the mixed composition as a filler. The slurry was made with a long net test machine to obtain a coated base paper having a basis weight of 60 g / m ² . Using a test gate roll coater, this base paper is coated at a rate of 1,200 m / min, 100 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Pimatech) and hydroxyethyl etherified starch (trade name PG295, pen) (Ford Co., Ltd.) A coating solution consisting of 25 parts was applied so that both sides were 6.0 g / m ² . Furthermore, using a test blade coater at a coating speed of 1,200 m / min, 40 parts of fine kaolin (trade name Japangloss, manufactured by JMHuber), 60 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Phimatec), Apply and dry a coating solution consisting of 10 parts of latex (trade names JSR00693, JSR) and 6 parts of hydroxyethyl etherified starch (trade name PG295, manufactured by Penford) to 18.0 g / m ² on both sides. A coated paper for printing was obtained. In the printing test using an offset rotary press, the number of blister occurrences, the measurement of the amount of paper dust, and the evaluation of back-through were performed. The results are shown in Table 1.
[Example 2]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. Fast VFH, manufactured by BASF) Add 10 parts of aqueous solution, and then add 100 parts of 2% unprocessed potato starch (manufactured by Nihon Food Processing Co., Ltd.) as starch paste, and mix at room temperature for 10 minutes. I got a thing. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 3]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. Fast VFH, manufactured by BASF) Add 10 parts of aqueous solution, and then add 100 parts of 2% urea-phosphorylated starch (trade name: Splet # 250, manufactured by Nippon Food Processing Co., Ltd.) as starch paste. The mixture composition was obtained by stirring for 10 minutes. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 4]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. Fast VFH (manufactured by BASF)) Add 10 parts of aqueous solution, and then add 100 parts of amphoteric starch (trade name: CATO3210, NSC Japan) paste solution with a concentration of 2% as starch paste solution and stir at room temperature for 10 minutes. Thus, a mixed composition was obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 5]
While stirring 100 parts slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, 2% polyamine epichlorohydrin (product) Name: AC7300, manufactured by Seiko PMC) Add 10 parts of aqueous solution, and then add 100 parts of raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) with a concentration of 2% as starch paste, and stir at room temperature for 10 minutes. A mixed composition was obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 6]
While stirring 100 parts slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, 2% polyamine epichlorohydrin (product) Name: AC7300, manufactured by Seiko PMC) Add 10 parts of aqueous solution, and then add 100 parts of amphoteric starch (product name: CATO315, manufactured by NSC Japan) as starch paste solution for 10 minutes at room temperature. The mixture composition was obtained by stirring. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 7]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, cationized starch (trade name: 2%) as a cationic compound. CATO304 (manufactured by NSC, Japan) Add 10 parts of paste, and then add 100 parts of 2% unprocessed corn starch (manufactured by Nippon Food Processing Co., Ltd.) as starch paste, and stir at room temperature for 10 minutes to mix A composition was obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 8]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, cationized starch (trade name: 2%) as a cationic compound. Add 10 parts of paste solution (CATO302, NSC Japan), and add 100 parts of 2% oxidized starch (trade name: SK-20, Nippon Corn Starch) paste solution as starch paste solution for 10 minutes at room temperature. The mixture composition was obtained by stirring. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 9]
Cationized starch with 2% concentration as a cationic compound (trade name: CATO304, manufactured by NSC Japan) 10 parts of starch paste, oxidized starch with 2% concentration as starch paste (trade name: MS-3800, Nippon Food Processing Co., Ltd.) (Product made) 100 parts of paste solution was added and stirred at room temperature for 10 minutes. This mixture was added as inorganic particles to 100 parts of a slurry of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) having a solid content concentration of 20% and stirred at room temperature for 10 minutes to obtain a mixed composition. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 10]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, cationized starch (trade name: 2%) as a cationic compound. CATO304 (manufactured by NSC, Japan) 10 parts of paste liquid is added, and then 100 parts of hydroxyethylated starch (trade name: ETHYLEX2025, manufactured by Staley) paste concentration 2% as starch paste liquid is added and stirred at room temperature for 10 minutes Thus, a mixed composition was obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 11]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, cationized starch (trade name: 2%) as a cationic compound. CATO304 (manufactured by NSC, Japan) 10 parts of paste solution is added, and then 100 parts of acetylated starch (trade name: Z-300, manufactured by Nissho Chemical Co., Ltd.) with a concentration of 2% as starch paste solution is added at room temperature. The mixture composition was obtained by stirring for 10 minutes. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 12]
While stirring 100 parts slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyamide epichlorohydrin with 2% concentration as a cationic compound (product) Name: WS4020, manufactured by Seiko PMC) Add 10 parts of aqueous solution, and then add 100 parts of 2% unprocessed corn starch (manufactured by Nippon Food Processing Co., Ltd.) as starch paste, and stir at room temperature for 10 minutes. A mixed composition was obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 13]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, diallyldimethylammonium chloride (Table 1) having a concentration of 2% as a cationic compound. Among them, 10 parts of an aqueous solution of homopolymer (trade name: AC7304, manufactured by Seiko PMC) is added, and 2% unprocessed corn starch (manufactured by Nippon Food Processing Co., Ltd.) paste 100 Part was added and stirred for 10 minutes at room temperature to obtain a mixed composition. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 14]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, diallyldimethylammonium chloride (Table 1) having a concentration of 2% as a cationic compound. Among them, 10 parts of an aqueous solution of a copolymer of acrylamide and acrylamide (trade name: N7527, manufactured by OndeoNalco) is added, and then 2% unprocessed corn starch (manufactured by Nippon Food Processing Co., Ltd.) 100 parts were added and stirred at room temperature for 10 minutes to obtain a mixed composition. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 15]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyethyleneimine (trade name: Katio) with a concentration of 2% as a cationic compound. (Fast SF, manufactured by Seiko PMC) Add 10 parts of aqueous solution, and then add 100 parts of 2% non-processed raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) as starch paste, and mix by stirring for 10 minutes at room temperature. A composition was obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 16]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyaluminum chloride (trade name: 2%) as a cationic compound. (PAC, manufactured by Nippon Light Metal Co., Ltd.) Add 10 parts of aqueous solution, and then add 100 parts of raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) with a concentration of 2% as starch paste liquid, and stir at room temperature for 10 minutes to mix. I got a thing. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 17]
While stirring 100 parts of a 20% solids slurry of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles, add 10 parts of 2% sulfuric acid band aqueous solution as a cationic compound. Further, 100 parts of raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) having a concentration of 2% as starch paste was added and stirred at room temperature for 10 minutes to obtain a mixed composition. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 18]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. Fast VFH, manufactured by BASF) Add 10 parts of aqueous solution, and further add 100 parts of 2% unprocessed corn starch (manufactured by Nihon Food Processing Co., Ltd.) as starch paste, and mix at room temperature for 10 minutes. I got a thing. A pulp slurry containing 75% LKP and 25% NKP as raw material pulp is mixed with a sulfuric acid band 0.8% per pulp weight, and a paper bulking agent (trade name: KB-110, manufactured by Kao Corporation) 1.0% per pulp weight. The composition was added to 15% by weight per paper weight. This slurry was paper-made with a long net type test machine so that the basis weight of the sheet was 60 g / m ² to obtain a coated base paper having a basis weight of 60 g / m ² . Using a test gate roll coater, this base paper is coated at a rate of 1,200 m / min, 100 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Pimatech) and hydroxyethyl etherified starch (trade name PG295, pen) (Ford Co., Ltd.) A coating solution consisting of 25 parts was applied so that both sides were 6.0 g / m ² . Furthermore, using a test blade coater at a coating speed of 1,200 m / min, 40 parts of fine kaolin (trade name Japangloss, manufactured by JMHuber), 60 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Phimatec), A coating solution consisting of 10 parts of latex (trade names: JSR00693, JSR) and 6 parts of hydroxyethyl etherified starch (trade name: PG295, manufactured by Penford) was coated and dried to 18.0 g / m ² on both sides. In the printing test using an offset rotary press, the number of blister occurrences, the measurement of the amount of paper dust, and the evaluation of back-through were performed. The results are shown in Table 1.
[Example 19]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, cationized starch (trade name: 2%) as a cationic compound. CATO302 (manufactured by NSC, Japan) Add 10 parts of paste, and then add 100 parts of 2% unprocessed corn starch (manufactured by Nippon Food Processing Co., Ltd.) as starch paste, and mix by stirring for 10 minutes at room temperature. A composition was obtained. A pulp slurry containing 75% LKP and 25% NKP as raw material pulp is mixed with a sulfuric acid band 0.8% per pulp weight, and a paper bulking agent (trade name: KB-110, manufactured by Kao Corporation) 1.0% per pulp weight. The composition was added to 15% by weight per paper weight. This slurry was paper-made with a long net type test machine so that the basis weight of the sheet was 60 g / m ² to obtain a coated base paper having a basis weight of 60 g / m ² . Using a test gate roll coater, this base paper is coated at a rate of 1,200 m / min, 100 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Pimatech) and hydroxyethyl etherified starch (trade name PG295, pen) (Ford Co., Ltd.) A coating solution consisting of 25 parts was applied so that both sides were 6.0 g / m ² . Furthermore, using a test blade coater at a coating speed of 1,200 m / min, 40 parts of fine kaolin (trade name Japangloss, manufactured by JMHuber), 60 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Phimatec), A coating solution consisting of 10 parts of latex (trade names: JSR00693, JSR) and 6 parts of hydroxyethyl etherified starch (trade name: PG295, manufactured by Penford) was coated and dried to 18.0 g / m ² on both sides. In the printing test using an offset rotary press, the number of blister occurrences, the measurement of the amount of paper dust, and the evaluation of back-through were performed. The results are shown in Table 1.
[Example 20]
While stirring 100 parts of a 20% solid slurry of heavy calcium carbonate (trade name: Super # 2000, manufactured by Maruo Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (product of 2% concentration as a cationic compound) Name: Catifast VFH, manufactured by BASF) Add 10 parts of aqueous solution, and then add 100 parts of 2% unprocessed corn starch (manufactured by Nippon Food Processing Co., Ltd.) as starch paste, and stir at room temperature for 10 minutes. Thus, a mixed composition was obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 21]
While stirring 100 parts of a 20% solids slurry of talc (trade name: NTL, manufactured by Nippon Talc Co., Ltd.) as inorganic particles at room temperature, 2% polyvinylamine (trade name: Cachio Fast VFH as a cationic compound) (Manufactured by BASF) Add 10 parts of aqueous solution, add 100 parts of 2% untreated corn starch (manufactured by Nippon Food Processing Co., Ltd.) as starch paste, and stir at room temperature for 10 minutes to mix the composition. Obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 22]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. Fast VFH (manufactured by BASF)) Add 25 parts of aqueous solution, then add 250 parts of raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) with a concentration of 2% as starch paste, and mix for 10 minutes at room temperature. I got a thing. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 23]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. (Fast VFH, manufactured by BASF) 50 parts of aqueous solution was added, and further 500 parts of raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) with a concentration of 2% as starch paste solution was added and stirred at room temperature for 10 minutes to mix composition I got a thing. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 24]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. Fast VFH (manufactured by BASF)) Add 100 parts of aqueous solution, and further add 1000 parts of raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) with a concentration of 2% as starch paste liquid, and stir at room temperature for 10 minutes to mix composition I got a thing. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Comparative Example 1]
Pulp slurry containing 75% LKP as raw material pulp and 25% NKP is 0.8% sulfuric acid band per pulp weight, and light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as filler is 15% by weight per paper weight. Were added. Furthermore, an aqueous solution of polyvinylamine (trade name: Catiofast VFH, manufactured by BASF) was added to 1% by weight per filler weight, and the raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) paste solution was adjusted to 10% by weight per filler weight. Was added. The slurry was made with a long net test machine to obtain a coated base paper having a basis weight of 60 g / m ² . Using a test gate roll coater, this base paper is coated at a rate of 1,200 m / min, 100 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Pimatech) and hydroxyethyl etherified starch (trade name PG295, pen) (Ford Co., Ltd.) A coating solution consisting of 25 parts was applied so that both sides were 6.0 g / m ² . Furthermore, using a test blade coater at a coating speed of 1,200 m / min, 40 parts of fine kaolin (trade name Japangloss, manufactured by JMHuber), 60 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Phimatec), Apply and dry a coating solution consisting of 10 parts of latex (trade names JSR00693, JSR) and 6 parts of hydroxyethyl etherified starch (trade name PG295, manufactured by Penford) to 18.0 g / m ² on both sides. A coated paper for printing was obtained. The results are shown in Table 1.
[Comparative Example 2]
Pulp slurry containing 75% LKP as raw material pulp and 25% NKP is 0.8% sulfuric acid band per pulp weight, and light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as filler is 15% by weight per paper weight. Were added. In addition, an aqueous solution of polyamine epichlorohydrin (trade name: AC7300, manufactured by Seiko PMC) was added to 1% by weight of filler weight, and raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) paste solution was added at 10 weight per filler weight. % Was added. The slurry was made with a long net test machine to obtain a coated base paper having a basis weight of 60 g / m ² . Using a test gate roll coater, this base paper is coated at a rate of 1,200 m / min, 100 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Pimatech) and hydroxyethyl etherified starch (trade name PG295, pen) (Ford Co., Ltd.) A coating solution consisting of 25 parts was applied so that both sides were 6.0 g / m ² . Furthermore, using a test blade coater at a coating speed of 1,200 m / min, 40 parts of fine kaolin (trade name Japangloss, manufactured by JMHuber), 60 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Phimatec), Apply and dry a coating solution consisting of 10 parts of latex (trade names JSR00693, JSR) and 6 parts of hydroxyethyl etherified starch (trade name PG295, manufactured by Penford) to 18.0 g / m ² on both sides. A coated paper for printing was obtained. The results are shown in Table 1.
[Comparative Example 3]
Pulp slurry containing 75% LKP as raw material pulp and 25% NKP is 0.8% sulfuric acid band per pulp weight, and light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as filler is 15% by weight per paper weight. Were added. In addition, cationized starch (trade name: CATO304, manufactured by NSC Japan) paste liquid was added to 1% by weight of filler, and raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) paste liquid was 10% by weight of filler. It added so that it might become. The slurry was made with a long net test machine to obtain a coated base paper having a basis weight of 60 g / m ² . Using a test gate roll coater, this base paper is coated at a rate of 1,200 m / min, 100 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Pimatech) and hydroxyethyl etherified starch (trade name PG295, pen) (Ford Co., Ltd.) A coating solution consisting of 25 parts was applied so that both sides were 6.0 g / m ² . Furthermore, using a test blade coater at a coating speed of 1,200 m / min, 40 parts of fine kaolin (trade name Japangloss, manufactured by JMHuber), 60 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Phimatec), Apply and dry a coating solution consisting of 10 parts of latex (trade names JSR00693, JSR) and 6 parts of hydroxyethyl etherified starch (trade name PG295, manufactured by Penford) to 18.0 g / m ² on both sides. A coated paper for printing was obtained. The results are shown in Table 1.
[Comparative Example 4]
Pulp slurry containing 75% LKP as raw material pulp and 25% NKP, sulfuric acid band 0.8% per pulp weight, paper bulking agent (trade name: KB-110, manufactured by Kao Corporation) 1.0% per pulp weight, light as filler Calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) was added at 15% by weight per paper weight. Furthermore, an aqueous solution of polyvinylamine (trade name: Catiofast VFH, manufactured by BASF) was added to 1% by weight per filler weight, and the raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) paste solution was adjusted to 10% by weight per filler weight. Was added. The slurry was made with a long net test machine to obtain a coated base paper having a basis weight of 60 g / m ² . Using a test gate roll coater, this base paper is coated at a rate of 1,200 m / min, 100 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Pimatech) and hydroxyethyl etherified starch (trade name PG295, pen) (Ford Co., Ltd.) A coating solution consisting of 25 parts was applied so that both sides were 6.0 g / m ² . Furthermore, using a test blade coater at a coating speed of 1,200 m / min, 40 parts of fine kaolin (trade name Japangloss, manufactured by JMHuber), 60 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Phimatec), Apply and dry a coating solution consisting of 10 parts of latex (trade names JSR00693, JSR) and 6 parts of hydroxyethyl etherified starch (trade name PG295, manufactured by Penford) to 18.0 g / m ² on both sides. A coated paper for printing was obtained. The results are shown in Table 1.
[Comparative Example 5]
Pulp slurry containing 75% LKP as raw material pulp and 25% NKP, sulfuric acid band 0.8% per pulp weight, paper bulking agent (trade name: KB-110, manufactured by Kao Corporation) 1.0% per pulp weight, light as filler Calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) was added at 15% by weight per paper weight. Furthermore, cationized starch (trade name: CATO302, manufactured by NSC Japan) paste liquid is added to 1% by weight of filler, and raw corn starch (manufactured by Nippon Food Processing Co.) paste liquid is 10% by weight of filler. It added so that it might become. The slurry was made with a long net test machine to obtain a coated base paper having a basis weight of 60 g / m ² . Using a test gate roll coater, this base paper is coated at a rate of 1,200 m / min, 100 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Pimatech) and hydroxyethyl etherified starch (trade name PG295, pen) (Ford Co., Ltd.) A coating solution consisting of 25 parts was applied so that both sides were 6.0 g / m ² . Furthermore, using a test blade coater at a coating speed of 1,200 m / min, 40 parts of fine kaolin (trade name Japangloss, manufactured by JMHuber), 60 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Phimatec), Apply and dry a coating solution consisting of 10 parts of latex (trade names JSR00693, JSR) and 6 parts of hydroxyethyl etherified starch (trade name PG295, manufactured by Penford) to 18.0 g / m ² on both sides. A coated paper for printing was obtained. The results are shown in Table 1.
[Comparative Example 6]
Pulp slurry containing 75% LKP and 25% NKP as raw pulp, 0.8% sulfuric acid band per pulp weight, heavy calcium carbonate (trade name: Super # 2000, manufactured by Maruo Calcium Co., Ltd.) as filler, 15 weight per paper weight % Was added. Furthermore, an aqueous solution of polyvinylamine (trade name: Catiofast VFH, manufactured by BASF) was added to 1% by weight per filler weight, and the raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) paste solution was adjusted to 10% by weight per filler weight. Was added. The slurry was made with a long net test machine to obtain a coated base paper having a basis weight of 60 g / m ² . Using a test gate roll coater, this base paper is coated at a rate of 1,200 m / min, 100 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Pimatech) and hydroxyethyl etherified starch (trade name PG295, pen) (Ford Co., Ltd.) A coating solution consisting of 25 parts was applied so that both sides were 6.0 g / m ² . Furthermore, using a test blade coater at a coating speed of 1,200 m / min, 40 parts of fine kaolin (trade name Japangloss, manufactured by JMHuber), 60 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Phimatec), Apply and dry a coating solution consisting of 10 parts of latex (trade names JSR00693, JSR) and 6 parts of hydroxyethyl etherified starch (trade name PG295, manufactured by Penford) to 18.0 g / m ² on both sides. A coated paper for printing was obtained. The results are shown in Table 1.
[Comparative Example 7]
Add pulp band containing 75% LKP and 25% NKP as raw material pulp to a sulfate band of 0.8% per pulp weight and filler as talc (trade name: NTL, manufactured by Nippon Talc Co., Ltd.) to 15% by weight of paper did. Furthermore, an aqueous solution of polyvinylamine (trade name: Catiofast VFH, manufactured by BASF) was added to 1% by weight per filler weight, and the raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) paste solution was adjusted to 10% by weight per filler weight Was added. The slurry was made with a long net test machine to obtain a coated base paper having a basis weight of 60 g / m ² . Using a test gate roll coater, this base paper is coated at a rate of 1,200 m / min, 100 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Pimatech) and hydroxyethyl etherified starch (trade name PG295, pen) (Ford Co., Ltd.) A coating solution consisting of 25 parts was applied so that both sides were 6.0 g / m ² . Furthermore, using a test blade coater at a coating speed of 1,200 m / min, 40 parts of fine kaolin (trade name Japangloss, manufactured by JMHuber), 60 parts of fine heavy calcium carbonate (trade name FMT-90, manufactured by Phimatec), Apply and dry a coating solution consisting of 10 parts of latex (trade names JSR00693, JSR) and 6 parts of hydroxyethyl etherified starch (trade name PG295, manufactured by Penford) to 18.0 g / m ² on both sides. A coated paper for printing was obtained. The results are shown in Table 1.

Examples 1-8, 10-17 using a mixed slurry prepared by adding a cationic compound and starch paste to light calcium carbonate and mixing them, and previously mixing the cationic compound and starch paste, In Example 9 using a mixed slurry prepared by mixing in addition to calcium, the filler yield and starch yield were higher than those of Comparative Examples 1 to 3 in which light calcium carbonate, a cationic compound and starch paste were separately added to the pulp. There has been a significant improvement. In addition, the amount of blisters and paper dust decreased significantly. On the other hand, the same applies to a system in which a bulking agent for paper is blended, and Examples 18 to 19 using a mixed slurry prepared by adding a cationic compound and starch paste to light calcium carbonate and mixing them are light calcium carbonate. Compared to Comparative Examples 4 to 5 to which a cationic compound and starch paste were added, the filler yield and starch yield were significantly improved. In addition, the amount of blisters and paper dust decreased significantly. Example 22 in which the amount of raw material corn starch, which is a cationic compound added to light calcium carbonate, which is an inorganic filler, is 2.5 times the amount of Example 1, and which is 5 times the amount of Example 1, In Example 24 in which the amount was 23 or 10 times that of Example 1, it was found that the filler yield and starch yield were improved and the amount of paper dust was further reduced. Furthermore, in the mixed slurry prepared by adding and mixing the cationic compound and starch paste to the inorganic filler, Example 20 using heavy calcium carbonate as the inorganic filler and Example 21 using talc are respectively applied to the pulp. Compared with Comparative Examples 6 and 7 in which the inorganic filler, the cationic compound, and the starch paste solution were added separately, the filler yield and the starch yield were significantly improved. In addition, the amount of blisters and paper dust decreased significantly.

Claims (6)

  Filler in which inorganic particles with an average particle size of 0.1 to 30 μm are surface-treated with a cationic compound and starch other than the cationic compound in a coated coated paper having a coating layer containing a pigment and an adhesive on the base paper Is a coated paper for printing, wherein the base paper has a filler content of 5 to 40% solids by weight.   The cationic compound is cationized starch, polyamine epichlorohydrin, polyamide epichlorohydrin, polyvinylamine, a homopolymer of diallyldimethylammonium chloride, a copolymer of diallyldimethylammonium chloride and acrylamide, polyethyleneimine, polyaluminum chloride, The coated paper for printing according to claim 1, wherein the coated paper is at least one selected from the group consisting of a sulfate band and a crosslinked cationized starch.   The starch for surface-treating inorganic particles is at least one paste liquid selected from the group consisting of oxidized starch, urea-phosphorylated starch, hydroxyethylated starch, amphoteric starch, acetylated starch, and raw starch. The coated paper for printing according to claim 1 or 2.   The inorganic particles are clay, calcined kaolin, deramikaolin, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, heavy calcium carbonate, light calcium carbonate, magnesium carbonate, barium carbonate, aluminum hydroxide, calcium hydroxide, The coated paper for printing according to any one of claims 1 to 3, wherein the coated paper is at least one selected from the group consisting of magnesium hydroxide and zinc hydroxide.   The mixing ratio of the inorganic particles, the cationic compound, and the starch is inorganic particles / cationic compound / starch = 100 / 0.1 / 0.1 to 100/100/100 in terms of solid content weight ratio. The coated paper for printing as described in any of the above.   In a method for producing a coated paper for printing, in which a coating liquid containing a pigment and an adhesive is applied to a base paper obtained by making a paper mainly composed of pulp and filler, an inorganic material having an average particle size of 0.1 to 30 μm Add a filler slurry prepared by mixing particles, cationic compounds, and starch paste other than cationic compounds to the paper stock, and make the base paper so that the filler content in the paper is 5-40% solids by weight A method for producing a coated paper for printing, comprising: