JP3136916B2 - Method for producing cast coated paper for inkjet recording, cast coated paper and recording method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cast coated paper having excellent white paper surface gloss and excellent ink jet recording (printing) suitability and cast operability, and a cast coated paper. It relates to the recording method used.

[0002]

2. Description of the Related Art In recent years, recording by an ink jet printer has been described.
Recordings are used in various fields because of low noise, high-speed recording, and easy multi-color recording. As the ink jet recording paper, high quality paper devised so as to be rich in ink absorbency, coated paper having a surface coated with a porous pigment, and the like are applied. All of these papers are so-called matte ink jet recording papers having low surface gloss.
However, recently, with the expansion of applications such as high-speed, high-definition, and full-color inkjet recording papers, inkjet recording papers having high surface gloss and excellent appearance have been demanded.

[0003] Generally, as a paper having a high surface gloss, a coated paper having a surface coated with a plate-like pigment and further subjected to a calender treatment as required, or a wet coated layer having a mirror-finished heating drum surface is used. There is known a so-called cast coated paper obtained by copying the mirror surface by pressing, drying, and releasing.

The cast coated paper has higher surface gloss and better surface smoothness than ordinary super calendered coated paper, and provides excellent printing effects. And the like, but it has various difficulties as ink jet recording paper.

That is, in general, cast coated paper obtains high gloss by forming a film-forming substance such as an adhesive in a pigment composition constituting the coated layer onto the mirror surface drum surface of the cast coater. On the other hand, the porosity of the coating layer is lost due to the presence of the film-forming substance, and the
There are problems such as extremely lowering of ink absorption. In order to improve the ink absorbency, it is important to make the cast coating layer porous so that the ink can be easily absorbed. For that purpose, it is necessary to reduce the amount of the film-forming substance. However, there has been a problem that the gloss of white paper is reduced as a result of reducing the amount of the film-forming substance.

Conventional cast coated papers have poor absorbability and fixability of hydrophilic ink. According to the study of the present inventors, in order to uniformly release from the mirror-surface drum, as a release agent, a salt of a fatty acid or polyethylene wax is usually contained in the cast coating layer. It is considered that the agent is generally strong in hydrophobicity, and thus tends to hinder the absorption of ink- jet ink . As described above, at present, it is extremely difficult to simultaneously satisfy both the surface gloss, the operability and the suitability for inkjet recording (printing) of cast coated paper.

[0007]

As described above, the present inventors have developed a cast coated paper which maintains the high surface smoothness and high gloss inherent in the cast coated paper and has excellent inkjet recording (printing) suitability. We worked diligently to get it. As a result, an undercoating layer is provided, and as a topcoating layer, a polymer containing a specific glass transition point is used, and a coating liquid containing a specific release agent is used, and cast finish is performed. In this way, it shows excellent inkjet print record suitability, maintains the original high gloss and good operability of cast coated paper, and achieves excellent inkjet print record suitability that could not be obtained with conventional cast coated paper. It has been found that a cast-coated paper with the same can be obtained. It is an object of the present invention to provide an excellent cast-coated paper in which poor ink absorption and poor fixing of ink-jet inks are particularly improved.

[0008]

The present invention includes the following aspects. [1] A base paper provided with an undercoating layer containing a pigment and an adhesive on one surface has a glass transition point of 40 ° C. or more ,
And a coating liquid containing a polymer obtained by polymerizing a monomer having an ethylenically unsaturated bond was coated to form a coating layer for casting, and the coating layer was heated while it was in a wet state. A method for producing a cast coated paper for ink jet recording, which is finished by pressing, drying and releasing a mirror drum, wherein the surface temperature of the mirror drum is 50 ° C. or more and less than 80 ° C., and A method for producing a cast coated paper for ink jet recording containing lecithin.

[0009] [2] base paper provided with an undercoat coating layer containing a pigment and an adhesive on one surface, has a glass transition point above 40 ° C., composed and by polymerizing a monomer having an ethylenically unsaturated bond A coating liquid containing a polymer is applied to form a coating layer for casting, and the coating layer is pressed against a heated mirror drum while the coating layer is in a wet state, dried and released to finish. It is a cast coated paper for inkjet recording, and the surface temperature of the mirror surface drum is 50 ° C. or more and less than 80 ° C.
And a cast coated paper for ink jet recording, wherein lecithin is contained in the cast coated layer.

[3] An ink jet recording method using the cast coated paper according to [2], wherein an aqueous ink is discharged from the fine holes to form a recorded image.

[4] The ink jet recording method according to [3], wherein the ink is ejected by applying thermal energy to the aqueous ink.

[0012]

As described above, the present inventors have made intensive studies on the coating composition for casting, and as a result, have found that
After an undercoat coating layer by this casting finishing in combination with coated composition containing a specific resin having a specific glass transition point as the cast paint with specific release agent, of the present invention The present inventors have found that a cast coated paper for ink jet recording can be obtained which maintains a desired excellent surface gloss and has excellent ink jet printing suitability and operability, and has completed the present invention.

That is, in the present invention, a polymer obtained by polymerizing a monomer having an ethylenically unsaturated bond (hereinafter referred to as an ethylenic monomer) contained in a coating liquid for coating (coating composition) includes, for example, Methyl acrylate,
Ethyl acrylate butyl acrylate, 2 ethylhexyl acrylate, lauryl acrylate, 2-hydroxyethyl acrylate, acrylate ester having an alkyl group carbon number of 1 to 18 such as glycidyl acrylate,
Methyl methacrylates, ethyl methacrylates, 2-hydroxyethyl methacrylates, 2-hydroxypropyl methacrylates, glycidyl methacrylates, etc., having 1 to 18 alkyl group carbon atoms, methacrylates, styrene, α-methylstyrene, vinyltoluene, acrylonitrile, vinyl chloride And vinylidene chloride, vinyl acetate, vinyl propionate, acrylamide, N-methylol acrylamide, ethylene, and butadiene.

The polymer may be a copolymer using two or more kinds of ethylenic monomers as needed, or may be a polymer or a substituted derivative of the copolymer. Examples of the substituted derivative include, for example, those having a carboxyl group or those having been rendered alkali-reactive. Further, the above-mentioned ethylenic monomer is polymerized in the presence of colloidal silica to form Si-OR.
(R: polymer component) It may be used in the form of a complex by bonding. The polymer obtained by polymerizing the above-mentioned ethylenic monomer needs to have a glass transition point of 40 ° C. or higher, preferably 50 ° C. or higher. The upper limit is not particularly limited, but is preferably about 100 ° C. or less.

That is, these polymers form a film above the glass transition point and impair the porosity of the surface of the cast coated paper, thereby reducing the absorption of ink during ink jet recording. Therefore, by performing a cast finish in a state where the polymer does not completely form a film, a highly glossy cast surface can be obtained while maintaining the porosity of the surface of the cast coated paper. Incidentally, when the glass transition point of the polymer is less than 40 ° C., it is preferable to finish the casting at a surface temperature of not more than 40 ° C. In this case, the drying speed of the cast coating composition containing the polymer tends to be slow. In some cases, operation may be performed at a low speed.

Further, pigments, dispersants, thickeners, defoamers, colorants, and the like used in general printing coated papers and ink-jet papers for adjusting whiteness, viscosity, fluidity, etc.
Various auxiliaries such as antistatic agents and preservatives are appropriately added and used in combination.

Next, a release agent which is another important element of the present invention will be described. As described above, the release agents conventionally used in cast paper include fatty acids such as stearic acid and oleic acid and metal salts thereof, hydrocarbons such as polyethylene emulsion, higher alcohols such as stearyl alcohol, and funnel oil. However, these release agents generally have high hydrophobicity and remain on the paper surface after the cast finish, resulting in poor absorption and fixation of the inkjet ink having strong hydrophilicity.

Lecithin used as a release agent in the present invention is a phospholipid extracted from egg yolk, soybean, etc., and can be added directly to a coating composition to form a stable emulsion with water. However, in general, it is preferable to add those which have been emulsified and dispersed in advance. Since lecithin has a relatively large number of hydrophilic groups as compared with a conventional release agent, it is considered that even if it remains on the paper surface, it can be absorbed quickly without repelling the inkjet ink . Also, excellent releasability can be obtained with a relatively small amount of addition. The amount of lecithin used in the present invention is generally 0.1 to 30% by weight based on 100 parts by weight of the polymer. It is preferable to adjust it in the range of about 10% by weight.

The effect of this lecithin as a release agent has already been disclosed in Japanese Patent Publication No. 35439/1991, but it relates to a rewet casting or gelling casting method in which the surface temperature of a mirror drum is 90 ° C. or higher. The effects are mainly related to the improvement of the releasability. On the other hand, in the present invention, the drum surface temperature is relatively low ( 8
(Less than 0 ° C. ), when added to a cast coating composition containing a specific polymer and cast by a wet cast method, not only the releasability but also the deterioration of the absorbability of the inkjet ink . It solves the problem.

Next, the pigment and the adhesive contained in the undercoat layer will be described. That is, as the pigment, for example, kaolin, clay, calcined clay, amorphous silica, zinc oxide,
Aluminum oxide, magnesium oxide, aluminum hydroxide, calcium carbonate, satin white, aluminum silicate, magnesium silicate, magnesium carbonate, diatomaceous earth,
Styrenic plastic pigments, urea resin-based plastic pigments, benzoguanamine plastic pigment and the like, although known and used various pigments in coated paper manufacturing field can be used, the inkjet ink absorbency, Lee
Amorphous silica, aluminum oxide, magnesium oxide, and the like, which are highly effective in improving ink coloring, are particularly preferably used.

Examples of the adhesive include proteins such as casein, soybean protein and synthetic protein, various starches such as starch and oxidized starch, polyvinyl alcohol, cellulose derivatives such as carboxymethylcellulose and methylcellulose, and styrene-butadiene copolymer. Conjugated diene-based polymer latex of methyl methacrylate-butadiene copolymer, acrylic-based polymer latex, vinyl-based polymer latex such as ethylene-vinyl acetate copolymer, etc. Are used alone or in combination. The adhesive is 5 to 5 with respect to the pigment.
0% by weight, more preferably in the range of 10 to 30% by weight.

In addition to the above pigments and adhesives, cationic resins used for general ink jet recording paper for fixing ink for ink jet recording,
Various auxiliaries such as a dispersant, a thickener, an antifoaming agent, a coloring agent, an antistatic agent and an antiseptic used for general coated paper are appropriately added and used in combination.

The composition for an undercoat coating layer composed of the above-mentioned materials is generally adjusted to have a solid component concentration of about 1 to 65% by weight, and has an undercoat of about 20 to 400 g / m ^2. Blade coater, air knife coater, roll coater, brush coater, champlex coater, bar coater, lip coater so that the dry weight is about ² to 50 g / m ² , more preferably about 5 to ²⁰ g / m ² on base paper. Alternatively, it is dried after being coated with various known coating devices such as a gravure coater. Further, if necessary, a smoothing process such as super calendering or brushing may be performed after the undercoating and drying.

The base paper for undercoating is not particularly limited, and acidic paper used for general coated paper,
Alternatively, neutral paper is applied.

The pigment thus provided on one surface
Base paper having an undercoating layer containing an adhesive and an adhesive
The above-mentioned cast coating solution containing the specific polymer and the release agent is coated with various known materials such as a blade coater, an air knife coater, a roll coater, a brush coater, a champlex coater, a bar coater, a lip coater or a gravure coater. Coating with a coating device of
While the coating layer is in a wet state as described above ,
In this method, a cast finish is performed by pressing, drying, and releasing a mirror-surface drum heated to a surface temperature of 50 ° C. or higher and lower than 80 ° C. If the drum temperature is 90 ° C. or higher, the resin (polymer) of the present invention forms a film, and the absorption of ink- jet ink is significantly reduced. Less than 80 ° C. is preferred. The lower limit of the drum surface temperature is preferably 50 ° C. or higher, more preferably 60 ° C. or higher, because the lower the temperature, the lower the drying speed of the coating layer and the lower the operating speed. The coating amount of the cast coating solution was 0.2 to 3 in terms of dry solid weight.
0 g / m ^2, preferably from 1 to 10 g / m ^2.

The ink jet recording method of the present invention using the thus obtained cast coated paper for ink jet recording is a method capable of effectively releasing ink from nozzles and applying ink to a recording medium which is a projectile. Any method may be used, but in particular, in the method described in JP-A-54-59936, the ink that has been subjected to the action of thermal energy causes a sudden volume change, and the action force due to this state change causes An ink jet recording method in which ink is ejected from nozzles can be used effectively.

An example of an ink jet recording apparatus suitable for the ink jet recording method of the present invention will be described below. FIGS. 1, 2 and 3 show examples of a head configuration which is a main part of the apparatus. That is, the head 13 is made of a glass, ceramic or plastic plate having a groove 14 through which ink passes, and a heating head 15 (a head is shown in the figure, but is not limited to this). Are obtained by bonding. The heating head 15 includes a protective film 16 made of silicon oxide or the like, and aluminum electrodes 17-1 and 17.
-2, a heating resistor layer 18 made of nichrome or the like, a heat storage layer 19, and a substrate 20 having good heat dissipation such as alumina.

The ink 21 has a discharge orifice (fine hole) 2
2, and the meniscus 23 is formed by the pressure P.

When an electric signal is applied to the electrodes 17-1 and 17-2, the area of the heating head 15 indicated by n rapidly generates heat, and bubbles are generated in the ink 21 in contact with the area, and the pressure is increased. As a result, the meniscus 23 protrudes, the ink 21 is ejected, and becomes a recording droplet 24 from the orifice 22, and flies toward the recording sheet 25. FIG. 3 shows an external view of a multi-head in which many heads shown in FIG. 1 are arranged. The multi-head includes a glass plate 27 having a multi-groove 26, and FIG.
The heat-generating head 28 similar to that described above is closely attached.

FIG. 1 shows a head 1 along an ink flow path.
3 is a sectional view, and FIG. 2 is a sectional view taken along line AB in FIG.

FIG. 4 shows an example of an ink jet recording apparatus incorporating such a head. In FIG.
Is a blade as a wiping member, one end of which is held by a blade holding member to be a fixed end, and forms a cantilever. The blade 61 is arranged at a position adjacent to the recording area by the recording head, and in this example, is held in a form protruding into the movement path of the recording head. Reference numeral 62 denotes a cap, which is disposed at a home position adjacent to the blade 61, and has a configuration in which the cap moves in a direction perpendicular to the direction in which the print head moves and comes into contact with the ejection port surface to perform capping. Further, reference numeral 63 denotes an ink absorber provided adjacent to the blade 61, which is held in a form protruding into the movement path of the recording head similarly to the blade 61. The blade 61, the cap 62, and the absorber 63 constitute an ejection recovery unit 64, and the blade 61 and the absorber 63 remove water, dust, and the like from the ink ejection port surface.

Reference numeral 65 denotes a recording head which has discharge energy generating means and discharges ink on a recording medium facing a discharge port surface provided with discharge ports to perform recording, and 66 denotes a recording head on which a recording head 65 is mounted. Is a carriage for performing the movement. The carriage 66 is slidably engaged with the guide shaft 67, and a part of the carriage 66 is connected to a belt 69 driven by a motor 68 (not shown). Accordingly, the carriage 66 can move along the guide shaft 67, and the recording area by the recording head 65 and the area adjacent thereto can be moved.

Reference numeral 51 denotes a paper feed unit for inserting a recording medium, 5
Reference numeral 2 denotes a paper feed roller driven by a motor (not shown). With these configurations, the recording medium is fed to a position facing the ejection port surface of the recording head, and is discharged via the discharge rollers 53 as the recording proceeds.

In the above configuration, when the recording head 65 returns to the home position at the end of recording or the like, the head recovery unit 6
The cap 62 of 4 is retracted from the moving path of the recording head 65, but the blade 61 protrudes into the moving path. As a result, the ejection port surface of the recording head 65 is wiped. When capping is performed by contacting the cap 62 with the protruding surface of the recording head 65, the cap 62 moves so as to protrude into the moving path of the recording head.

When the recording head 65 moves from the home position to the recording start position, the cap 62 and the blade 61 are at the same position as the position at the time of wiping described above. As a result, the projection surface of the recording head 65 is wiped even during the movement.

The above-described movement of the print head to the home position is performed not only at the end of printing or at the time of ejection recovery, but also at a predetermined interval while the print head moves through the printing area for printing. The wiping is performed in accordance with the movement to the position.

On the other hand, the ink used in the ink jet recording method of the present invention comprises, as essential components, a dye for forming an image and a liquid medium for dissolving or dispersing the dye.
If necessary, various dispersants, surfactants, viscosity modifiers,
It is prepared by adding a specific resistance adjuster, a pH adjuster, a fungicide, a dissolution (or dispersion) stabilizer for the recording agent, and the like.

Examples of the recording agent used in the ink include direct dyes, acid dyes, basic dyes, reactive dyes, edible dyes, disperse dyes, oil dyes, and various pigments. Can be used without. The content of such a dye is determined depending on the type of the liquid medium component, the characteristics required for the ink, and the like, but in the case of the ink of the present invention, the composition as in the conventional ink, that is, There is no particular problem in use at a ratio of about 0.1 to 20% by weight.

The ink used in the present invention is a liquid solvent obtained by dissolving or dispersing the above-mentioned dye, and water or water and a water-soluble organic solvent may be a polyhydric alcohol having an ink drying preventing effect. What is contained is used.

[0040]

EXAMPLES The present invention will now be described in detail with reference to examples, but is of course not limited thereto. Parts and% in Examples are parts by weight and% by weight, respectively, unless otherwise specified.

Example 1 100 parts of amorphous silica as a pigment, 5 parts of polyvinyl alcohol as a binder, 10 parts of oxidized modified starch, and a polyethylene polyamine resin as a cationic resin (polyethylene polyamine dicyandiamide ammonium salt, manufactured by Nikka Chemical Co., Ltd.) Polycondensate, trade name: PNF7
0) 4 parts and 0.5 part of sodium polyphosphate as a dispersant were added to prepare an undercoating coating solution having a solid content of 18%. The undercoating coated liquid, the basis weight 100 g / m ² Undercoat YoHara
The paper was coated with an air knife coater to a dry weight of 7 g / m ² and dried to obtain a base paper .

On the other hand, 100 parts of a styrene-2-methylhexyl acrylate copolymer having a glass transition point of 85 ° C. as a coating liquid for casting, 100 parts of colloidal silica, and soybean extract lecithin as a release agent were emulsified with a nonionic surfactant. A coating liquid composed of 2 parts (as solid content) of the emulsion and having a solid content concentration of 35% was prepared. After coating the casting coating liquid on the base paper using a roll coater,
Immediately, it was pressed against a mirror-surface drum having a surface temperature of 75 ° C., dried, and released to obtain a cast coated paper for inkjet recording. The coating amount of the coating liquid for casting at this time was 5 g / m ² in terms of solid content weight.

Example 2 Styrene having a glass transition point of 70 ° C. was used as a cast coating liquid.
Composite of methyl acrylate copolymer and colloidal silica (copolymer: colloidal silica = 50 parts: 50 parts) 1
00 parts, 2 parts of an emulsion obtained by emulsifying soybean extract lecithin as a release agent with a nonionic surfactant (as solid content)
A coating solution having a solid concentration of 40% was prepared. The coating liquid for casting was coated on the base paper of Example 1 using a roll coater, immediately pressed against a mirror-surface drum heated to a surface temperature of 60 ° C., dried, released, and cast for inkjet recording. A coated paper was obtained. The cast coating amount at this time was 6 g / m ² in terms of solid content weight.

Example 3 100 parts of a styrene-methyl acrylate copolymer having a glass transition point of 50 ° C. as a cast coating liquid and 1 part of an emulsion obtained by emulsifying soybean extract lecithin as a release agent with a nonionic surfactant (solid content) A coating liquid having a solid concentration of 35% was prepared. After applying the coating liquid for casting on the base paper of Example 1 using a roll coater,
Immediately, it was pressed against a mirror-surface drum having a surface temperature of 60 ° C., dried, and released to obtain a cast coated paper for inkjet recording. At this time, the coating amount of the coating liquid for casting was 3 g / m ² in terms of solid content weight.

Example 4 30 parts of aluminum oxide as a pigment, 30 parts of light calcium carbonate, 40 parts of amorphous silica, 5 parts of starch as a binder, styrene-butadiene copolymer latex 10
Part, polyethylene polyamine resin (Polycondensate of polyethylene polyamine dicyandiamidammonium, manufactured by Nikka Chemical Co., Ltd., trade name: PN)
F70) and 0.5 part of sodium polyphosphate as a dispersant were added to prepare an undercoating coating liquid having a solid content of 30%. The undercoating coated liquid, the basis weight 60 g / m ² Undercoat
The base paper was coated with a blade coater to a dry weight of 15 g / m ² and dried to obtain a base paper . The coating liquid for casting used in Example 1 was coated and cast-coated on the base paper in the same manner as in Example 1 to obtain a cast coated paper for inkjet.

Example 5 A cast coated paper for ink jet recording was obtained in the same manner as in Example 1 except that the temperature of the mirror drum was changed to 85 ° C.

Comparative Example 1 In Example 1, the release agent was calcium stearate 2
A cast coated paper for inkjet recording was obtained in the same manner as in Example 1 except that the parts were changed.

Comparative Example 2 In Example 2, the release agent was ammonium oleate 2
A cast coated paper for inkjet recording was obtained in the same manner as in Example 2 except that the parts were changed.

Comparative Example 3 A cast coated paper for ink jet recording was obtained in the same manner as in Example 1 except that no release agent was added.

Comparative Example 4 Emulsion 2 in which 100 parts of a styrene-butadiene copolymer having a glass transition point of 0 ° C. was used as a cast coating liquid, and soybean extract lecithin was emulsified with a nonionic surfactant as a release agent
A coating liquid having a solid content concentration of 35% was prepared. This cast coating solution was applied on the base paper of Example 1.
Using a roll coater was coated, immediately the surface temperature is pressed against the mirror surface drum of 60 ° C., after drying, is the release, the
A cast coated paper for inkjet recording was obtained. At this time, the coating amount of the coating liquid for casting was 5 g / m ² in terms of solid content weight.

Comparative Example 5 A cast coated paper for ink jet recording was obtained in the same manner as in Example 1, except that the surface temperature of the mirror drum was changed to 95 ° C.

Comparative Example 6 Solid consisting of 60 parts of kaolin as cast coating liquid, 40 parts of light calcium carbonate, 10 parts of casein, 10 parts of styrene-methyl methacrylate having a glass transition point of 10 ° C., and 10 parts of calcium stearate as a release agent Min concentration 4
A 5% coating liquid for casting was prepared. This coating solution was applied onto the base paper of Example 1 using a roll coater, immediately pressed against a mirror drum having a surface temperature of 75 ° C., dried, and released to obtain a cast coated paper. The coating amount of the coating liquid for casting at this time was 15 g / m ² in terms of solid content weight.

Comparative Example 7 A cast coated paper for ink jet recording was obtained in the same manner as in Example 1, except that soybean lecithin as the release agent was changed to monostearyl phosphate.

Comparative Example 8 A cast coated paper for ink jet recording was obtained in the same manner as in Example 1 except that the temperature of the mirror surface drum was changed to 100 ° C. Comparative Example 9 A cast coated paper for inkjet recording was obtained in the same manner as in Comparative Example 1, except that the calcium stearate in the coating liquid for casting was increased from 2 parts to 15 parts. Comparative Example 10 A cast coated paper for inkjet recording was obtained in the same manner as in Comparative Example 2, except that the amount of ammonium oleate in the coating liquid for casting was increased from 2 parts to 15 parts.

Table 1 shows the results of glossiness of white paper, suitability for ink jet recording , and cast operability of the thus obtained cast coated paper. In addition, about the said evaluation, evaluation was performed by the following methods.

(White Paper Gloss) Measured according to JIS-P8142.

( Ink Absorption for Inkjet Recording) Color Image Jet IO-735 manufactured by Sharp Corporation
Printing was performed with X (printer), and the drying property of the ink was visually evaluated. ：: No stain at all even if touched with a finger immediately after printing. Δ: Slightly stained when touched with a finger immediately after printing, but almost dry, no practical problem. ×: It takes 3 minutes or more until the ink dries after printing. XX: Due to poor drying of the ink, the ink flows during printing and is not practical.

(Ink Coloring After Inkjet Recording)
Color Image Jet IO-73 manufactured by Sharp Corporation
Printing was performed with a 5X (printer), and the density of the ink was visually evaluated. However, if the ink absorbency is poor,
Regarding the sample evaluated as "x", the evaluation of the coloring density was not performed (indicated by "-"). ：: Good color density. Δ: The color density is slightly low, but there is no practical problem. ×: The coloring density is too low to be practical.

(Cast operability) A: Continuous operation is possible without any problem. Δ: Low speed, but continuous operation is possible. ×: A drum pick occurs during operation, but operation is possible (intermittently) by cleaning the drum. XX: Drum picking occurred remarkably due to poor releasability, and operation was not possible.

[0060]

[Table 1]

An ink jet printer (BJC-8) for ejecting ink by applying thermal energy to aqueous ink
20J (trade name: manufactured by Canon Inc.), ink jet recording was performed on the cast coated papers of the above Examples and Comparative Examples.
Excellent ink color development, cast operability and glossiness of white paper.

As is clear from the results shown in Table 1, the cast coated paper obtained in the examples according to the present invention has a surface glossiness,
It was excellent in inkjet printer suitability and could be produced efficiently.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a head section of an ink jet recording apparatus.

FIG. 2 is a cross-sectional view of a head section of the inkjet recording apparatus.

FIG. 3 is an external perspective view of a head obtained by multiplying the head shown in FIG.

FIG. 4 is a perspective view illustrating an example of an inkjet recording apparatus.

[Explanation of symbols]

 13: Head 14: Groove for passing ink 15: Heating head 16: Protective film 17-1: Aluminum electrode 17-2: Aluminum electrode 18: Heating resistor layer 19: Heat storage layer 20: Substrate 21: Ink 22: Orifice 23: Meniscus 24: Recording droplet 25: Recording sheet 26: Multi-groove 27: Glass plate 28: Heating head 51: Paper supply unit 52: Paper feed roller 53: Discharge roller 61: Blade 62: Cap 63: Ink absorber 64: Ejection recovery unit 65: recording head 66: carriage 67: guide shaft 68: motor 69: belt

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-59694 (JP, A) JP-A-61-194295 (JP, A) JP-A-3-161594 (JP, A) JP-A 63-194594 211394 (JP, A) JP-A-2-113986 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41M 5/00 B32B 27/10 B32B 27/20 D21H 19/44

Claims (4)

(57) [Claims] 1. A base paper provided with an undercoating layer containing a pigment and an adhesive on one surface thereof has a glass transition point of 40 ° C. or higher.
And a coating liquid containing a polymer obtained by polymerizing a monomer having an ethylenically unsaturated bond is coated to form a coating layer for casting, and heating is performed while the coating layer is in a wet state. A method for producing a cast coated paper for ink jet recording, which is finished by pressing, drying, and releasing a finished mirror-surface drum, wherein the surface temperature of the mirror-surface drum is 50 ° C. or more and less than 80 ° C.
And a method for producing a cast coated paper for inkjet recording, wherein lecithin is contained in the cast coated layer. 2. A base paper provided with an undercoating layer containing a pigment and an adhesive on one surface thereof has a glass transition point of 40 ° C. or higher.
And a coating liquid containing a polymer obtained by polymerizing a monomer having an ethylenically unsaturated bond is coated to form a coating layer for casting, and heating is performed while the coating layer is in a wet state. A cast coated paper for ink jet recording, which is finished by pressing, drying, and releasing the finished mirror-surface drum, wherein the surface temperature of the mirror-surface drum is 50 ° C. or more and less than 80 ° C., and in the cast coating layer. Cast coated paper for ink jet recording containing lecithin. 3. The cast coated paper according to claim 2,
An ink jet recording method for forming a recorded image by discharging aqueous ink from micropores. 4. The ink jet recording method according to claim 3, wherein the ink is ejected by applying thermal energy to the aqueous ink. Detailed description