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US20070233024A1 - Sanitary Thin Paper and Process for Producing the Same - Google Patents

Sanitary Thin Paper and Process for Producing the Same Download PDF

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Publication number
US20070233024A1
US20070233024A1 US11/597,961 US59796106A US2007233024A1 US 20070233024 A1 US20070233024 A1 US 20070233024A1 US 59796106 A US59796106 A US 59796106A US 2007233024 A1 US2007233024 A1 US 2007233024A1
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United States
Prior art keywords
based compound
fatty acid
sanitary thin
paper
thin paper
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Abandoned
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US11/597,961
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English (en)
Inventor
Tetsuya Uehara
Yoshinori Shimizu
Hiroshi Ono
Akira Hirasawa
Saeko Ito
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Daio Paper Corp
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Daio Paper Corp
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Assigned to DAIO PAPER CORPORATION reassignment DAIO PAPER CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HIRASAWA, AKIRA, ITO, SAEKO, ONO, HIROSHI, SHIMIZU, YOSHINORI, UEHARA, TETSUYA
Publication of US20070233024A1 publication Critical patent/US20070233024A1/en
Abandoned legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/22—Agents rendering paper porous, absorbent or bulky
    • D21H21/24—Surfactants
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/002—Tissue paper; Absorbent paper
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
    • A47K10/00—Body-drying implements; Toilet paper; Holders therefor
    • A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet-paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
    • A47K10/32—Dispensers for paper towels or toilet-paper
    • A47K2010/3266—Wet wipes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/14—Carboxylic acids; Derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/53—Polyethers; Polyesters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
    • D21H17/55—Polyamides; Polyaminoamides; Polyester-amides

Definitions

  • the present invention relates to a sanitary thin paper for example for a domestic use and a for producing the same, and provides a particularly soft and smooth sanitary thin paper, including tissue paper or toilet paper.
  • Patent Reference 1 In order to ensure a softness, addition of a quaternary ammonium salt is considered to be effective as disclosed in Patent Reference 1. Also as disclosed in Patent Reference 2, a polysiloxane substance is attempted to be added.
  • Patent Reference 2 Japanese Patent Publication No. 2806974
  • a main objective of the invention is to provide a sanitary thin paper which is highly excellent both in terms of softness and smoothness as well as a process for producing the same.
  • the invention is established as follows.
  • a sanitary thin paper which employs a pulp as a raw material and contains a fatty acid ester-based compound and a fatty acid amide-based compound internally or externally.
  • polyester-based compound is added in an amount, on dried mass basis, of 0.05 to 30.0% by mass based on said pulp raw material.
  • a crepe is formed at a paper making stage, and the crepe is formed in such a shape that the apex distance in the machine direction of the crepe is 0.1 mm or less, and the length in the width direction of the crepe is 0.5 mm or less.
  • a process for producing a sanitary thin paper comprising adding a fatty acid ester-based compound and a fatty acid amide-based compound to a wet paper as a pulp raw material internally, and then adding a polyester-based compound to said wet paper externally on-line.
  • a process for producing a sanitary thin paper comprising adding a fatty acid ester-based compound and a fatty acid amide-based compound to a wet paper as a pulp raw material internally and/or externally, and then adding externally on line a polyester-based compound to said pulp wet paper or a dry paper obtained by drying the same.
  • the excellence is experienced not only in terms of softness but also in terms of smoothness.
  • the reasons for this excellence may be explained as described below.
  • a fatty acid amide-based compound not only serves to enhance the bulkiness but also gives a moisture-retaining wetness/smoothness. Both of these fatty acid ester-based compound and fatty acid amide-based compound are also known to be preferable especially if they are cationic.
  • a thin film of the polyester can be formed on the surface of the pulp fiber, which serves to reduce the friction between fibers on a superficial layer upon touch to a skin. Accordingly, a resultant sanitary thin paper is porous, moistening, soft, and its surface is smooth.
  • a polyester-based compound externally since a thin polyester film is intended to be formed on the pulp fiber surface.
  • a fatty acid ester-based compound is added internally since it is intended to enter between the fibers to loosen the inter-fiber binding.
  • a fatty acid amide-based compound may be added externally, although it exerts a higher effect when added internally.
  • the smoothness was found to be related greatly to the crepe morphology.
  • the apex distance L in the machine direction of the crepe (paper) is 0.1 mm or less
  • the widthwise length W of the crepe is 0.5 mm or less.
  • An apex distance L of the machine direction of the crepe which is short and 0.1 mm or less gives a smoothness.
  • a widthwise length W of the crepe exceeding 0.5 mm the smoothness upon wiping a skin with a sanitary thin paper while moving in the machine direction is affected adversely.
  • a sanitary thin paper may for example be a tissue paper or a toilet paper. It may be used as a cosmetic paper.
  • a basis weight (gsm, JIS P 8124) per 1 ply of 7 to 40 g/m 2 preferably 10 to 35 g/m 2 , more preferably 11.0 to 17.0 g/m 2
  • a weight less than 7 g/m 2 leads to a difficulty in paper making, and a weight less than 10 g/m 2 results in a too thin paper which may undergo problematic perforation at a stage of paper making.
  • a weight exceeding 40 g/m 2 results in a too thick and hard paper, and a weight exceeding 35 g/m 2 results in a coarse crepe, if made, on the paper, yielding a poor surface.
  • An inventive sanitary thin paper may be of 2-ply (two sheets make a unit) or 3-ply or more. While the invention exerts an especially marked effect when it is a tissue paper which should have a necessary paper strength, it may be a toilet paper.
  • An inventive sanitary thin paper can be produced by a known facility and a known process.
  • a pulp raw material may be subjected to a paper making machine followed preferably by a crepe treatment or calender treatment.
  • An inventive sanitary thin paper in this embodiment employs as a softener for a sanitary thin paper a polyester-based compound represented by General Formula (1), which is added to a pulp raw material.
  • polyester-based compound can be dissolved or dispersed in water since it is water-soluble, it is used preferably as being dissolved in a solvent such as isopropyl alcohol or dipropylene glycol because of its high molecular weight.
  • a polyester-based compound represented by General Formula (1) can be produced by a known process from an aromatic dicarboxylic acid or its derivative and a glycol represented by General Formula HO—(R 2 O) a-H.
  • an aromatic dicarboxylic acid may for example be a phthalic acid such as terephthalic acid and isophthalic acid
  • its derivative may for example be a lower alkyl ester of such a dicarboxylic acid, including dimethyl ester, diethyl ester, dipropyl ester and dibutyl ester, a chloride of such a dicarboxylic acid, and also a phthalic anhydride. Any one of such aromatic dicarboxylic acids or their derivatives may be used, or a mixture of two or more may be used.
  • a glycol represented by General Formula HO—(R 2 O) a-H may for example be ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, polyethylene glycol, polypropylene glycol, a random or block copolymer of propylene oxide with ethylene oxide having hydroxyl groups at both ends.
  • any one of such glycols may be used or a mixture of two or more may be used.
  • “a” is 1 to 200, more preferably 1 to 150. An “a” exceeding 200 results in a too high viscosity of the polyester-based compound represented by General Formula (1), which may lead to a difficulty in handling.
  • all “a” s may be same or different in an identical molecule.
  • a polyester-based compound represented by General Formula (1) in which all “a” s are same can be produced for example by reacting a dimethyl ester of terephthalic acid, isophthalic acid, phthalic acid and the like with a polyethylene glycol having a certain molecular weight and conducting an transesterification reaction accompanied with de-methanol reaction.
  • a polyester-based compound represented by General Formula (1) in which a repeating unit having “a” of 1 and a repeating unit having “a” of several tens to a hundred and several tens can be produced for example by reacting a dihydroxy ester of terephthalic acid, isophthalic acid, phthalic acid and the like with a polyethylene glycol having a certain molecular weight and conducting an transesterification reaction accompanied with de-ethylene glycol reaction.
  • “b” is 2 to 100, more preferably 2 to 30. A “b” exceeding 100 results in a too high viscosity of the polyester-based compound represented by General Formula (1), which may lead to a difficulty in handling.
  • the weight mean molecular weight of a polyester-based compound represented by General Formula (1) is preferably 1,000 to 200,000, more preferably 10,000 to 50,000.
  • a weight mean molecular weight of a polyester-based compound less than 1,000 may lead to an insufficient softness imparting effect.
  • a weight mean molecular weight of a polyester-based compound exceeding 200,000 may result in a too high viscosity of the polyester-based compound, which may lead to a difficulty in handling.
  • the weight mean molecular weight of a polyester-based compound can be determined by a gel permeation chromatography using a monodisperse polyethylene glycol having a known molecular weight.
  • a polyester-based compound represented by General Formula (1) may be added at a content (in an amount to be added) which is not limited particularly, preferably it is added externally in an amount, on dried mass basis, of 0.05 to 30.0% by mass based on said pulp raw material, more preferably 0.5 to 5.0% by mass.
  • An amount of the polyester-based compound represented by General Formula (1) less than 0.05% by mass may lead to an insufficient softness imparting effect.
  • An amount of the polyester-based compound represented by General Formula (1) exceeding 30.0% by mass results in a higher softness imparting effect, but also poses a problem including stickiness.
  • the invention may contain a water-soluble polyurethane resin represented by General Formula (3) if necessary.
  • a water-soluble polyurethane resin can be added in an amount, on dried mass basis, of 0.05 to 7% by mass based on the pulp raw material.
  • the weight ratio of a polyester-based compound and the water-soluble polyurethane resin is 100/1 to 55/45, preferably 100/1 to 70/30.
  • the process for addition may be an external procedure such as spray application, offset application and the like.
  • R 1 is a polyalkylene ether glycol chain having a molecular weight of 400 to 5000
  • R 2 is the formulae:
  • Z is an integer of 3 to 300.
  • the addition of a polyester-based compound mentioned above enables an addition to pulp fibers while not being affected by the hydrogen bond of the pulp raw material, possibly undergoing coating on each pulp fiber, resulting in a smoothness.
  • fatty acid ester-based compounds both of cationic fatty acid ester-based compounds and anionic fatty acid ester-based compounds.
  • a fatty acid ester-based compound is added internally
  • a fatty acid amide-based compound is added internally or externally.
  • the addition of an additive may be accomplished externally, for example by spray application, offset application and the like.
  • an internal addition thus, mixing into a paper making raw material prior to the paper making may be employed.
  • a chemical solution may be added in an amount, on dried mass basis, of 0.002 to 10 parts by mass per 100 parts by mass of said pulp raw material.
  • the ratio of (a)/(b) is preferably 0.1 to 500.
  • a fatty acid ester-based compound of (a) permeates into a fiber when depositing onto the fiber to allow for a hydrogen bond between the insides of the lumens (voids) upon drying whereby preventing a crash, resulting in a further bulky soft paper. Nevertheless, in the absence of the cationic property, it is not fixed readily in a fiber by itself, posing a difficulty in exerting its effect.
  • a fatty acid ester-based compound may for example be a compound made from a C6-C24 alcohol and a C7-C25 fatty acid.
  • a C6-C24 alcohol may be a straight alcohol, branched alcohol, saturated alcohol and unsaturated alcohol.
  • a C10-22 alcohol is preferred, with lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol and oleoyl alcohol being particularly preferred. Any one of such alcohol may be used, or a mixture of two or more may be used.
  • a fatty acid amide-based compound of (b) coats the surface of each individual fiber to impart a bulkiness together with a lubricity on the surface, whereby improving the paper surface smoothness.
  • An inventive fatty acid amide compound can be obtained by reacting a polyalkylene polyamine and a carboxylic acid.
  • a polyalkylene polyamine employed in the invention contains at least three amino groups in its molecule and is represented by the following formula: H 2 N—(R 1 —NH—) n —R 1 —NH 2 (4) wherein each R 1 is independently a C1-4 alkylene group, and n is an integer of 1 to 3.
  • R 1 in Formula (4) shown above are methylene group, ethylene group, trimethylene group, tetramethylene group and butylene group. Different R 1 s may be present in one molecule, and two or more polyalkylene polyamines may be employed. A preferred R 1 is an ethylene group. A number of carbons in the alkylen group exceeding 4 leads to a difficulty in handling. If an amide compound obtained from such a compound is used, a bulky and soft paper can be employed.
  • a carboxylic acid employed in the production of an amide compound is a C10-24 carboxylic acid.
  • Such a carboxylic acid may be a saturated carboxylic acid, unsaturated carboxylic acid, straight carboxylic acid or branched carboxylic acid. Nevertheless, at least 40% by mass should correspond to a carboxylic acid having at least either one of an unsaturated bond or a branched chain.
  • a C10-24 carboxylic acid may for example be any of following compounds: a single fatty acid such as capric acid, lauric acid, myristic acid, palmitic acid, palmitoleic acid, isopalmitic acid, stearic acid, oleic acid, linolic acid, linoleic acid, isostearic acid, arachic acid, behenic acid, erucic acid, lignoceric acid and the like; and a natural fat-derived mixed fatty acid such as coconut oil fatty acid, palm oil fatty acid, beef tallow fatty acid, lard fatty acid, soybean oil fatty acid, rapeseed oil fatty acid, toll oil fatty acid, olive oil fatty acid, cocoa butter fatty acid, sesame oil fatty acid, corn oil fatty acid, sunflower oil fatty acid, cotton seed oil fatty acid and the like, as well as hydrogenated derivatives thereof.
  • a single fatty acid such as capric acid, lauric acid, my
  • Any one of these may be used alone, or a mixture of two or more may be used.
  • a C12-22 carboxylic acid is preferred, with a C14-C18 carboxylic acid being preferred especially.
  • a carboxylic acid having less than 10 carbon atoms yields an amide compound which shows only a poor bulkiness and softness improving effect, while one whose number of carbons exceeds 24 may lead to a difficulty in handling of resultant amide compound.
  • an unsaturated bond-carrying carboxylic acid may for example be oleic acid, linolic acid, linoleic acid, erucic acid and palmitoleic acid, and a branched chain-carrying carboxylic acid may be isopalmitic acid and isostearic acid. Any of these fatty acid may contain other fatty acids as impurities, and such fatty acid can also be employed.
  • a natural mixed fatty acid containing 40 to 100% by mass of unsaturated carboxylic acids may for example be a soybean oil fatty acid, palm oil fatty acid, olive oil fatty acid, cocoa butter fatty acid, sesame oil fatty acid, corn oil fatty acid, sunflower oil fatty acid, cotton seed oil fatty acid, beef tallow fatty acid, lard fatty acid and the like.
  • carboxylic acids having at least either one of unsaturated bonds and branched chains or mixtures thereof those especially preferred are soybean oil fatty acid, oleic acid and erucic acid.
  • a fatty acid amide-based compound in this embodiment can be obtained by reacting a polyalkylene polyamine represented by Formula (4) shown above with a carboxylic acid mentioned above.
  • a carboxylic acid is employed in an amount of 1.5 to 2.5 moles, preferably 1.8 to 2.2 moles per 1 mole of a polyalkylene polyamine.
  • An amount less than 1.5 moles makes it impossible to obtain a sufficiently bulky soft paper, while an amount exceeding 2.5 moles leads to a difficulty in handling of the resultant amide compound.
  • an amide compound described above can be used as it is as an additive, it can be handled more easily when used as a salt by neutralizing with an inorganic acid or organic acid.
  • an inorganic acid may for example be hydrochloric acid, sulfuric acid, carbonic acid, nitric acid, phosphoric acid and the like.
  • organic acid examples include formic acid, acetic acid, propionic acid, octylic acid, butyric acid, oxalic acid, malonic acid, itaconic acid, adipic acid, succinic acid, sebacic acid, citric acid, hydroxybenzoic acid, malic acid, hydroxymalonic acid, lactic acid, salicylic acid, hydroxyvaleric acid, aspartic acid, glutamic acid, taurine, sulfamic acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid and the like.
  • organic acids are preferred, with formic acid, acetic acid and lactic acid being particularly preferred.
  • the amount of an acid to form a salt can be selected appropriately depending on the purpose by measuring the entire amine value of a product obtained by the reaction described above.
  • an inorganic acid or an organic acid equivalent to the entire amine value is added to form a salt of the amide compound.
  • An amide compound thus obtained or a salt thereof can easily be handled, and can produce a bulky soft paper. Also when adding this compound to a pulp slurry formed by dispersing a pulp fiber in water at a certain rate, foaming can advantageously be inhibited.
  • a paper strength agent such as a starch, polyacrylamide-based superficial paper strength agent, a polyvinyl alcohol and the like is added internally, with a starch being preferred especially.
  • a fatty acid ester-based compound and a fatty acid amide-based compound are added internally to a pulp wet paper to which then a polyester-based compound is added online externally or a fatty acid ester-based compound and a fatty acid amide-based compound are added internally and/or externally and then a polyester-based compound is added online externally to a pulp wet paper or dry paper, other appropriate moisturizing agent or lubricant can be added in a separate step.
  • Such a moisturizing agent may for example be polyethylene glycol, glycerin, 1,3-butylene glycol, 1,2-pentanediol, erythritol, sorbitol, xylitol, maltitol, propylene glycol, dipropylene glycol, diglycerin, sodium pyrrolidone carboxylate, lactic acid, sodium lactate and the like.
  • a lubricant may for example be a polysiloxane such as silicone oil, silicone powder and the like. If necessary, a polyester-based compound described above can be converted into a microparticle for example by means of emulsification whereby being used as a powder particle.
  • a silicone powder consisting of powder particles whose mean particle size is 0.1 to 30 ⁇ m is especially preferred. Alternatively, an aggregated powder of the powder particle mentioned above whose mean particle size is 10 to 100 ⁇ m is also preferred.
  • a pulp fiber whose NBKP content is 30 to 80% by mass and whose LBKP is 20 to 70% by mass is employed preferably in a major part. While the pulp raw material can contain 30% by mass or less, preferably 10% by mass or less of an waste paper pulp if necessary, one containing 100% by mass of virgin pulp is more preferable in view of softness and the like.
  • a sanitary thin paper in this embodiment has an area ratio of the void excluding the area occupied by a pulp fiber F in the widthwise section of a paper shown schematically in FIG. 2 (thus an area ratio of the non-hatched region excluding a pulp fiber F in a unit area S in FIG. 2 ) which is 50% or more.
  • a higher area ratio results in a softer touch.
  • An excessively high area ratio results in a reduced strength and a reduced firmness.
  • the number of the pulp fibers each of which has a distance of 1 ⁇ m or more from the adjacent pulp fiber in the section in the width direction of the paper is 50% or more of the number of all pulp fibers. And most preferably the number of those of 5 ⁇ m or more is 50% or more. Similarly in this case a higher rate of the number results in a softer touch. An excessively high rate of the number results in a reduced strength.
  • An MMD as an index of the surface characteristics are preferably 9.0 or less, especially 8.5 or less for a tissue paper, and 13 or less, especially 11 or less for a toilet paper.
  • a frictional texture tester KESSE manufactured by KATO TECH CO., LTD. can be employed.
  • a friction probe consisting of a piano wire of 0.5 mm in diameter and having a contact length of 5 mm was brought into contact with a paper sample under a load of 10 g while applying to the paper sample a tension of 20 g/cm in the direction of the movement with moving over a distance of 2 cm at a rate of 0.1 cm/sec whereby measuring a friction coefficient.
  • a softness of 1.5 or less, especially 1.4 or less for a tissue paper, and 3.5 or less, especially 2.5 or less for a toilet paper is preferred.
  • the ratio between LBKP and NBKP as pulp raw material, the types of the pulps (fiber coarseness, types and ages of source wood materials and the like), freeness, paper moisture, calender gap/pressure/material, chemical solution addition and its quantity and the like may vary appropriately.
  • the pulp contains no waste pulp.
  • tensile strength, aspect ratio, crepe morphology (crepe rate, crepe height), moisture content, density, addition of paper strengthening agents, addition of chemical solutions as well as their quantities may also vary appropriately. Desired surface characteristics can be obtained also by varying pulp incorporation, calender condition, paper moisture, doctor blade tip angle, blade angle, balance between adhesion/peeling strength, crepe rate, addition of chemical solutions and their quantities and the like appropriately.
  • the effects of the addition of the additives are of important.
  • a softener component including a fatty acid ester-based compound and a fatty acid amide-based compound is discussed below.
  • a softener added to a sanitary thin paper is preferably a cationic surfactant.
  • a cationic surfactant is not limited particularly, and preferably an amine compound having in its molecule at least one C6-26 saturated or unsaturated hydrocarbon group or a neutralized or quaternized derivative thereof as well as a mixture thereof. More specifically, such a preferred amine compound or a neutralized or quaternized derivative thereof has in its molecule at least one, preferably one or two, most preferably two C6-26, preferably C14-22 saturated or unsaturated hydrocarbon group such as an alkyl or alkenyl group.
  • Such a hydrocarbon group may have in its chain an ester group, reversed ester group, amide group, reversed amide group, ether group.
  • Such a hydrocarbon group can be introduced for example by using a fatty acid obtained by hydrogenating or partially hydrogenating a beef tallow-derived non-hydrogenated fatty acid or unsaturated moiety employed usually in an industrial field, a fatty acid or a fatty acid ester obtained by hydrogenating or partially hydrogenating a plant-derived non-hydrogenated fatty acid or fatty acid ester or unsaturated moiety derived from palm or coconut.
  • X ⁇ is an anion, wherein E is an ethylene group and P is a propylene group, and the total of m and n is 1 to 60, where m and n denote mean addition mole numbers, is also employed preferably.
  • Particularly contemplated here is a C6-24 alkyl group-carrying trimethylmonoalkylammonium halide and/or a C6-24 alkyl group-carrying dimethyldialkylammonium halide.
  • an alkyl group and/or an alkenyl group-carrying imidazoline ring-carrying quaternary ammonium salt may be a compound represented by General Formula (6): wherein R 6 is a C6-24 alkyl group or a C6-24 alkenyl group, R 7 is a C1-24 alkyl group or a C1-24 alkenyl group and X ⁇ is an anion.
  • an alkoxylated fatty acid ester can be employed.
  • a cationic surfactant which can be employed in the invention may also be an alkylammonium salt represented by R1R2R3R4N+X-, wherein R1 is selected from an alkyl group having about 12 to about 18 carbon atoms, or an aromatic aryl or alkaryl group having about 12 to about 18 carbon atoms; each of R2, R3 and R4 is independently of one another selected from a hydrogen atom, an alkyl group having about 1 to about 18 carbon atoms, or an aromatic aryl or alkaryl group having about 12 to about 18 carbon atoms; X is an anion selected from chloride, bromide, iodide, acetate, phosphate, nitrate, sulfate, methyl sulfate, ethyl sulfate, tosylate, lactate, glycolate as well as mixtures thereof.
  • the alkyl group may contain an ether bond or hydroxy or amino group-substituted form (for example, the alky
  • Another useful cationic surfactant is an aminoamide in which R1 in the structure shown above is converted into R5CO—(CH 2 ) n — wherein R5 is an alkyl group having about 12 to about 18 carbon atoms; n is an integer of about 2 to about 6, preferably about 2 to about 4, more preferably about 2 to about 3).
  • Non-limiting examples of such a cationic emulsifier are stearamide propyl PG-dimonium chloride phosphate, stearamide propylethyl dimonium ethosulfate, stearamide propyldimethyl (myristyl acetate) ammonium chloride, stearamide propyldimethyl cetearyl ammonium tosylate, stearamide propyldimethyl ammonium chloride, stearamide propyldimethyl ammonium lactate as well as mixtures thereof.
  • Non-limiting examples of a quaternary ammonium salt cationic surfactant are cetylammonium chloride, cetylammonium bromide, laurylammonium chloride, laurylammonium bromide, stearylammonium chloride, stearylammonium bromide, cetyldimethyl ammonium chloride, cetyldimethyl ammonium bromide, lauryldimethyl ammonium chloride, lauryldimethyl ammonium bromide, stearyldimethyl ammonium chloride, stearyldimethyl ammonium bromide, cetyltrimethyl ammonium chloride, cetyltrimethyl ammonium bromide, lauryltrimethyl ammonium chloride, lauryltrimethyl ammonium bromide, stearyltrimethyl ammonium bromide, lauryltrimethyl ammonium bromide, stearyltrimethyl ammonium bromide, lauryltrimethyl ammonium bromide,
  • An additional quaternary ammonium salt is one whose C12-C22 alkyl carbon chain is derived from a tallow fatty acid or coconut fatty acid.
  • tallow generally means an alkyl group derived from a tallow fatty acid in which C12-C18 alkyl chains coexist (usually a hydrogenated tallow fatty acid) .
  • coconut generally means an alkyl group derived from a coconut fatty acid in which C12-C18 alkyl chains coexist (usually a hydrogenated tallow fatty acid).
  • Examples of a quaternary ammonium salt derived from the tallow and coconut origins are ditallow dimethyl ammonium chloride, ditallow dimethyl ammonium methyl sulfate, di(hydrogenated tallow) dimethyl ammonium chloride, di(hydrogenated tallow) dimethyl ammonium acetate, ditallow dipropyl ammonium phosphate, ditallow dimethyl ammonium nitrate, di(coconut alkyl) dimethyl ammonium chloride, di(coconut alkyl) dimethyl ammonium bromide, tallow ammonium chloride, coconut ammonium chloride, stearamide propyl PG-dimonium chloride phosphate, stearamide propylethyl dimonium ethosulfate, stearamide dimethyl (myristyl acetate) ammonium chloride, stearamide dipropylmethyl cetearylammonium tosylate, stearamide dimethyl ammoni
  • a preferable cationic surfactant useful here includes dilauryl dimethyl ammonium chloride, distearyl dimethyl ammonium chloride, dimyristyl dimethyl ammonium chloride, dipalmityl dimethyl ammonium chloride, distearyl dimethyl ammonium chloride, as well as mixtures thereof.
  • a softener may for example be a polyethylene polyamine higher fatty acid amide-type cationic surfactant, imidazoline-type cationic surfactant and a quaternary ammonium salt-type cationic surfactant such as an alkyldimetyl ammonium chloride, with a polyethylene polyamine higher fatty acid amide-type cationic surfactant being preferred especially because of a higher softening effect.
  • Such a polyethylene polyamine higher fatty acid amide-type cationic surfactant may for example be a polyethylene polyamine higher fatty acid amide (e1), a polyoxyalkylene polyethylene polyamine higher fatty acid amide (e2), a polyethylene polyamine higher fatty acid amide urea condensate (e3), a polyoxyalkylene polyethylene polyamine higher fatty acid amide urea condensate (e4), (e1) to (e4) epichlorohydrin adduct (e5), a polyethylene polyamine higher fatty acid amide alkyl chloride quaternized salt (e6), a polyethylene polyamine higher fatty acid amide monochloroacetic acid adduct amphoteric compound (e7) and a polyethylene polyamine higher fatty acid amide partial imidazolinium salt (e8) and the like.
  • e1 polyethylene polyamine higher fatty acid amide
  • e2 polyoxyalkylene polyethylene polyamine higher fatty acid amide
  • a polyethylene polyamine as a constituent of these (e1) to (e8) may for example be diethylene triamine, triethylene tetramine, tetraethylene pentamine and the like. Among these, diethylene triamine and triethylene tetramine are preferred.
  • a polyoxyalkylene group constituting (e2) or (e4) is a group to which an alkylene oxide is added.
  • Such an alkylene oxide may for example be ethylene oxide, propylene oxide and butylene oxide.
  • ethylene oxide and a combination of ethylene oxide with propylene oxide (block or random addition) are preferred.
  • the mixing weight ratio when using a combination of ethylene oxide with propylene oxide is preferably 1:(0.1 to 1.0).
  • the molar number of the alkylene oxide to be added is usually 1 to 10 moles, preferably 1 to 5 moles.
  • a higher fatty acid as a constituent of these (e1) to (e8) is usually one derived from a natural fatty acid such as a palm oil, beef tallow, rapeseed oil, rice bran oil, fish oil and the like
  • a synthetic higher fatty acid produced by a petroleum chemical process may also be employed.
  • a higher fatty acid having an iodine value of 50 or less and 12 to 24 carbon atoms is preferred.
  • Another constituent of these (e1) to (e8) namely a polyethylene polyamine or a polyoxyalkylene polyethylene polyamine is present in a molar ratio to a higher fatty acid usually of 1:1.0 to 2.5, preferably 1:1.2 to 1.8.
  • a polyethylene polyamine or a polyoxyalkylene polyethylene polyamine is present in a molar ratio to a higher fatty acid usually of 1:1.0 to 2.5, preferably 1:1.2 to 1.8.
  • those preferred are (e1) to (e5).
  • the evaluation was made by measuring an MIU value related to the friction coefficient using a KES test machine manufactured by KATO TECH CO., LTD. A smaller value reflects a smoother texture.
  • an inventive product was evaluated in a sensory test to be excellent both in terms of “softness” and “smoothness”.
  • Softener A Nonionic fatty acid ester (NIPPON PMC, SFS1001)
  • Softener B Cationic fatty acid ester (NIPPON PMC, SFS1002)
  • Softener C Cationic fatty acid ester (NIPPON PMC, SFS1004)
  • Softener D Cationic fatty acid amide (NOF, bulk agent J)
  • the sensory test was on the basis of 5-point evaluation. A % void area and a % fiber number were measured by stacking 6 samples whose top and bottom were covered with OHP sheets, which was cut by a sharp shaving blade at an angle of 90°, and the sectional view of a sample after cutting was taken as a ⁇ 1000 SEM photograph, which was then evaluated.
  • the invention can be applied as a sanitary thin paper for example for a domestic use including tissue paper or toilet paper and a process for producing the same, especially as a soft and smooth sanitary thin paper.
  • FIG. 1 shows a schematic view of a crepe in a sanitary thin paper, (a) a surface, (b) a B-B view on arrow.
  • FIG. 2 is a widthwise sectional view of a paper.
  • FIG. 3 is a schematic view of an MMD testing process.
  • TABLE 1 Exper- Exper- Exper- Exper- Exper- Exper- Exper- Exper- Unit iment 1 iment 2 iment 3 iment 4 iment 5 iment 6 Internal Basis weight (gsm) g/m 2 12.0 15.0 16.0 21.0 12.0 21.0 addition
  • Fatty acid ester-containing softener SEIKO % 0.1 0.1 0.1 0.1 0.1 0.1 PMC CORPORATION, TFS301
  • Fatty acid amide-containing softener NOF, % 0.08 0.08 0.08 0.08 0 0 DZ2220
  • Wet paper strengthening agent SEIKO PMC % 0.6 0.6 0.1 0.1 0.6 0 CORPORATION, WS547)
  • Wet paper Polyester-based compound (NICCA % 0.1 0.1 0.9 0.1 0 0.1 external CHEMICAL, (*A-POLE*) ES-500) addition Evaluation Smoothness (MIU

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JP2017193789A (ja) * 2016-04-18 2017-10-26 王子ホールディングス株式会社 衛生薄葉紙およびその製造方法
JP2019130110A (ja) * 2018-01-31 2019-08-08 大王製紙株式会社 衛生薄葉紙および衛生薄葉紙の製造方法
US10550521B2 (en) 2015-09-30 2020-02-04 Daio Paper Corporation Toilet paper
CN111886382A (zh) * 2018-03-22 2020-11-03 巴克曼实验室国际公司 改性的起皱用胶粘剂配制物和使用其的起皱方法
US10844549B2 (en) * 2016-09-30 2020-11-24 Daio Paper Corporation Tissue paper
US20240209576A1 (en) * 2019-03-27 2024-06-27 Daio Paper Corporation Toilet paper and method for producing toilet paper

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JP2007307287A (ja) * 2006-05-22 2007-11-29 Meiko Shoji Kk 身体拭き取り用の繊維体
JP4833936B2 (ja) * 2007-07-31 2011-12-07 ライオン株式会社 薄葉紙
JP5410026B2 (ja) * 2008-03-17 2014-02-05 大王製紙株式会社 衛生用薄葉紙
JP2010084273A (ja) * 2008-09-30 2010-04-15 Hakuto Co Ltd 改質剤及びそれを含む紙製品
JP5479835B2 (ja) * 2009-09-30 2014-04-23 大王製紙株式会社 水解性衛生薄葉紙及びトイレットペーパーロール
JP5445203B2 (ja) * 2010-02-16 2014-03-19 日油株式会社 紙用添加剤
WO2015022738A1 (ja) * 2013-08-14 2015-02-19 アスクル株式会社 ティシュペーパー原紙及びティシュペーパー
JP6242018B2 (ja) * 2015-06-16 2017-12-06 大王製紙株式会社 ティシュペーパー
JP6210567B2 (ja) 2015-09-14 2017-10-11 大王製紙株式会社 ティシュペーパー
JP7133943B2 (ja) 2018-02-28 2022-09-09 大王製紙株式会社 ティシュペーパー
JP6689944B1 (ja) * 2018-11-30 2020-04-28 大王製紙株式会社 トイレットペーパー
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US10550521B2 (en) 2015-09-30 2020-02-04 Daio Paper Corporation Toilet paper
US10731299B2 (en) 2015-09-30 2020-08-04 Daio Paper Corporation Method of manufacturing a toilet paper
JP2017193789A (ja) * 2016-04-18 2017-10-26 王子ホールディングス株式会社 衛生薄葉紙およびその製造方法
US10844549B2 (en) * 2016-09-30 2020-11-24 Daio Paper Corporation Tissue paper
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CN1977082A (zh) 2007-06-06

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