TW202407187A - Paper treatment agent, paper using the same and method for improving the texture of papers - Google Patents

Abstract

An object of the present invention is to provide: a paper treatment agent capable of imparting a specific texture suitable for the user's preference to papers to which moisture retention performance has been imparted, reducing a change in the moisture content of the papers under a high humidity environment and a low humidity environment, and suppressing moisture evaporation of the papers even under a low humidity environment; papers using the same; and a method of improving the texture of papers. The paper treating agent of the present invention contains (A) a polyhydric alcohol, (B) a sulfonate and (C) water, and the content of (B) a sulfonate is 0.05% by mass or more and less than 8.0% by mass based on the total amount excluding water.

Description

Paper treatment agent, paper using the paper treatment agent, and method for improving paper feel

The present invention relates to a paper treatment agent, paper using the paper treatment agent, and a method for improving the feel of the paper.

Paper that is required to have a soft, moist feel and is treated with a paper treatment agent containing moisturizing ingredients such as moisturizing wipes with a soft touch is widely used in paper fields such as toilet paper and paper towels. Paper such as this moisturizing tissue is coated with a paper treatment agent blended with a polyhydric alcohol such as glycerin in order to impart flexibility. Since this softness is manifested by the reduction of hydrogen bonds between pulp/pulp due to an increase in the moisture content of coated paper, there is a risk of paper damage due to a reduction in paper strength under high humidity environmental conditions. Due to the problem of handfeel deterioration under low-humidity environmental conditions, paper products such as moisturizing tissues with low dependence on humidity environments have been sought.

In addition, among papers treated with paper treatment agents containing moisturizing ingredients, moisturizing tissues are often used for wiping nose mucus. In order to reduce the burden on the skin, people are seeking to reduce surface friction and other textures. Good product. As a product, it is desired to provide paper with moisturizing properties and a texture that matches the user's preference.

Various countermeasures have been taken in the past in an attempt to solve the aforementioned technical problems of imparting low humidity environment dependence and softness and improving hand feel. For example, Patent Document 1 proposes a fiber web product containing a hydrogel composition in a fiber web. However, this method involves complicated steps to uniformly process the gel-like gel composition paper before coating, and it also has problems such as difficulty in transferring the gel composition. In Patent Document 2, the water absorbency of the hydrophilic polymer is used to improve the moist feeling. However, since uniform dispersion of the hydrophilic polymer requires time and labor, the steps in the production of the paper treatment agent are complicated. And hydrophilic polymers cause significant viscosity increase. Therefore, the compounding amount of the hydrophilic polymer has to be limited, resulting in insufficient effects. In Patent Document 3, an oil substance and a water-soluble wax are used in order to provide softness and reduce friction. However, the water-soluble wax has a high viscosity, impairing the fluidity and uniform coating properties of the paper treatment agent, and impairing the operability. Worsening problem.

In Patent Document 4 and Patent Document 5, glycerol and branched alcohol or sucrose fatty acid ester are blended to improve softness and skin feel under low-humidity environmental conditions. These bases have the advantage of being easily formulated into moisturizers, but while they help maintain softness in low-humidity environmental conditions, their effectiveness is not sufficient.

Patent Documents 6 to 9 describe sulfonates as surfactants blended in paper treatment agents.

[Prior Art Document]

[Patent Document]

Patent Document 1: Japanese Patent Application Publication No. 2003-199685

Patent Document 2: Japanese Patent Application Publication No. 2009-263837

Patent Document 3: Japanese Patent Application Publication No. 10-226986

Patent Document 4: Japanese Patent Application Publication No. 2007-107173

Patent Document 5: Japanese Patent Application Publication No. 2016-074999

Patent Document 6: Japanese Patent Application Publication No. 2019-099938

Patent Document 7: Japanese Patent Application Publication No. 2019-157307

Patent Document 8: Japanese Patent Application Publication No. 2008-073118

Patent Document 9: Japanese Patent Application Publication No. 2010-265562

However, in Patent Documents 6 to 8, sulfonate is described in the examples as an optional component or as a component arbitrarily selected from a plurality of surfactants. However, the amount of the sulfonate is not studied. In the disclosure, since the amount of sulfonate is large, it is difficult to provide paper with a characteristic feel of coreless softness. In addition, fluidity cannot be maintained in the state of the paper treatment agent, resulting in hardness. problem.

Patent Document 9 describes a sulfonate as a component arbitrarily selected from surfactants. However, in the disclosure of a specific preparation of the sulfonate, since it does not contain water, its effect is insufficient and difficult to express. It has a characteristic feel. In addition, under low humidity environmental conditions, there is a problem of deterioration of the feel.

The present invention was made in view of the above-mentioned problems, and its object is to provide a paper that has been provided with moisturizing properties and can provide a specific texture that matches the user's preference. Paper treatment agents and paper treatment agents that have a small change in the moisture content of paper between high-humidity environmental conditions and low-humidity environmental conditions and can suppress the evaporation of water in paper even under low-humidity environmental conditions. Paper using the paper treatment agent and a method for improving the feel of the paper.

In order to solve the above-mentioned problems, the present inventors have repeatedly conducted in-depth research and found that a paper treatment agent that contains a specific range of sulfonate and water together with a polyol can impart a special smoothness like silk to paper. It has a refreshing hand feel, and surprisingly, it is also found that it can impart coreless softness to paper, and the moisture content of paper changes little under high-humidity environmental conditions and low-humidity environmental conditions, even at low humidity. This invention was completed by being able to suppress evaporation of water in paper even under environmental conditions. Here, the specific smooth feel like silk refers to the smooth feeling like touching gel.

That is, the paper treatment agent of the present invention is characterized in that it contains (A) polyol, (B) sulfonate, and (C) water, and the ratio of the aforementioned (B) sulfonate relative to the total amount excluding water is The content is 0.05% by mass or more and less than 8.0% by mass except water.

The paper of the present invention is characterized by being treated with the aforementioned paper treatment agent.

The method for improving the hand feeling of paper according to the present invention is characterized by treating it with the aforementioned paper treatment agent.

The paper treatment agent of the present invention is prepared by blending (B) sulfonate in a specific range with (A) polyol and further blending (C) water, especially by blending (B) sulfonate in a specific range. The specific combination of acid salt and (C) water gives paper a smooth feel and coreless softness with a soft, silk-like texture, and is durable in both high-humidity and low-humidity environments. The moisture content of the paper under the conditions changes little, and the water evaporation of the paper can be suppressed even under low humidity environmental conditions.

Further, by formulating (B) sulfonate in a specific range with (A) polyol, and then formulating (C) water, especially by formulating (B) sulfonate and (C) in a specific range. The specific combination of water that coats paper The paper treatment agent of the present invention can maintain the moisture content appropriately and can suppress the swelling of the pulp compared with conventional paper treatment agents, thereby imparting coreless softness.

This softness is imparted not only by blocking hydrogen bonds between pulps due to moisture, but also by suppressing the swelling of the pulp to moderately relax the paper. Therefore, the paper treated with the paper treatment agent of the present invention The paper has low dependence on humidity environment. Due to its low dependence on moisture, paper treated with the paper treatment agent of the present invention feels soft, but does not reduce the strength of the paper and is less likely to be damaged.

The paper treatment agent of the present invention can suppress water evaporation of paper even under low-humidity environmental conditions. Therefore, texture deterioration is less likely to occur under low-humidity environmental conditions.

According to the present invention, it is possible to impart a specific slippery feel and coreless softness like silk to paper provided with moisturizing properties, and the paper can be used under high-humidity environmental conditions and under low-humidity environmental conditions. The moisture content of the paper changes little, and it can suppress the evaporation of water in the paper even under low humidity environmental conditions. These effects are significant effects that exceed the effects that can be predicted by those skilled in the art based on the constitution of the present invention.

Hereinafter, the present invention will be described in detail.

In the present invention and the following description, the term "feel" particularly includes a specific slippery feel like silk, and a loose and fluffy feel that reduces the burden on the skin and is reminiscent of the skin. Coreless softness for skin gentleness.

(paper treatment agent)

The paper treatment agent of the present invention requires (A) polyol, (B) sulfonate and (C) water as essential conditions.

(A)Polyol

In the paper treatment agent of the present invention, the polyol of component (A) is a moisturizing agent that enhances the hygroscopicity and moisturizing properties of paper and imparts moist feeling and softness to paper.

The polyol as component (A) is not particularly limited, and examples thereof include glycerin, diglycerin, triglycerin, polyglycerin, 1,2-propanediol, 1,3-propanediol, dipropylene glycol, polypropylene glycol, 1,3 -Butanediol, 1,4-butanediol, 1,2-pentanediol, 1,2-hexanediol, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, polyoxyethylene Ethylene glyceryl ether, isopentyl glycol, neopentyl erythritol, trimethylol propane, etc.

In addition, sugar alcohols or sugars may be used. Examples of the sugar alcohols include sorbitol, inositol, glucosyltrehalose, xylitol, erythritol, mannitol, lactitol, and fructose. Oligosaccharide alcohols, maltitol, reduced isomaltulose, reduced maltitol and reduced starch hydrolyzate, etc. Examples of sugars include fructose, glucose, lactose, xylose, psicose, maltose, syrup, oligosaccharides, maltobiose, trehalose, lactose, oligosaccharides, sucrose, and isomerized sugars. Isomaltooligosaccharide, fructooligosaccharide, galactooligosaccharide, xylooligosaccharide, lactulooligosaccharide, soybean oligosaccharide, raffinose, stevia sugar, licorice, saccharin, aspartame sugar substitute, acetyl Sulfonamide K, sucralose, etc.

These may be used individually by 1 type, or in combination of 2 or more types.

Among them, glycerol, 1,3-butanediol, 1,2-propanediol, and sorbitol are preferred; glycerol is more preferred.

The content of the polyhydric alcohol (A) is not particularly limited. For example, the content of the polyhydric alcohol (A) is 1 mass % or more relative to the total amount of the paper treatment agent except water. From the viewpoint of improving the feel by absorbing moisture on coated paper (A) polyol, the content of (A) polyol is preferably 50 mass % or more, more preferably, relative to the total amount of paper treatment agents excluding water. It is 70 mass % or more, more preferably 80 mass % or more, particularly preferably 85 mass % or more, and most preferably 90 mass % or more. In addition, from improving in From the viewpoint of the unique feel in the present invention, the content of the (A) polyol is preferably 99.5 mass % or less, more preferably 98 mass % or less relative to the total amount of the paper treatment agent except water.

(B)Sulfonate

In the paper treatment agent of the present invention, the sulfonate of component (B) is blended with (A) polyol in an amount within a specific range, and (C) water is blended to impart a silk-like texture to paper. It has a unique smooth feel and coreless softness, and the moisture content of the paper changes little between high-humidity environmental conditions and low-humidity environmental conditions, and it can suppress the moisture content of the paper even under low-humidity environmental conditions. Evaporate.

(B) The sulfonate has more than one sulfonate structure ₍ -SO ₃ . The hydrophobic group preferably contains an alkyl group.

The number of carbon atoms in the alkyl group of the sulfonate is not particularly limited, and examples thereof include carbon atoms of 4 to 30 (C4 to C30). From the viewpoint of improving a specific slippery feel like silk and a coreless soft feel, especially a specific smooth feel like silk, the number of carbon atoms in the alkyl group is preferably 8 or more, more preferably 10 or more. The best is 14 or more, and the best is 16 or more. The number of carbon atoms in the alkyl group is preferably 26 or less, more preferably 24 or less, still more preferably 22 or less, and particularly preferably 18 or less, from the viewpoint of being easily soluble in the polyol and exhibiting the effects of the present invention more easily. The number of carbon atoms in the alkyl group here represents an integer. It should be noted that these alkyl groups may be either unsaturated or saturated, or may be linear or branched.

The sulfonate of component (B) used in the present invention is not particularly limited, and examples thereof include alkyl sulfonate, alkyl benzene sulfonate, alkyl naphthalene sulfonate, and sulfosuccinate ester salt. , Sulfo fatty acid ester salt, α-olefin sulfonate, acetylenyl alkyl taurate, sodium coconut fatty acid methyl taurate, etc. These may be used individually by 1 type, or in combination of 2 or more types.

Among them, from the viewpoint of exerting the effects of the present invention, alkyl sulfonates, alkyl benzene sulfonates, sulfosuccinate ester salts, and sulfo fatty acid ester salts are preferred; alkyl sulfonates are more preferred. , alkylbenzene sulfonate, sulfosuccinate salt.

The cation relative to the sulfonic acid anion in (B) the sulfonate is not particularly limited, and examples thereof include alkali metal ions such as sodium ions and potassium ions.

(B) The content of the sulfonate is 0.05% by mass or more and less than 8.0% by mass relative to the total amount of the paper treatment agent except water, but it improves the specific slippery feeling like silk and coreless softness. From the viewpoint of strength, the content of the sulfonate is preferably 0.1 mass% or more, more preferably 0.2 mass% or more, further preferably 0.4 mass% or more, based on the total amount of the paper treatment agent except water. More preferably, it is 0.7 mass% or more, still more preferably, it is 1.5 mass% or more, and particularly preferably, it is 2.0 mass% or more. In addition, from the viewpoint of improving the fluidity of the paper treatment agent, the content of the sulfonate is preferably 7.9 mass% or less, more preferably 6.0 mass% or less, based on the total amount of the paper treatment agent except water. More preferably, it is 5.0 mass % or less.

In the paper treatment agent of the present invention, the mass ratio ((B) Component/(A) component) is preferably 0.001 or more, more preferably 0.007 or more, still more preferably 0.015 or more, and particularly preferably 0.02 or more. From the viewpoint of the fluidity of the treatment agent, it is preferably 0.085 or less, more preferably 0.07 or less, and still more preferably 0.053 or less.

(C)Water

In the paper treatment agent of the present invention, the water of component (C) is an essential component that exhibits the effects of the present invention in combination with the sulfonate salt of component (B).

The water as component (C) is not particularly limited, and examples thereof include ion-exchanged water, tap water, sterilized water, and the like.

(C) The content of water is not particularly limited, but may be, for example, 0.1 to 90% by mass relative to the total amount of the paper treatment agent. Considering the stability and viscosity of the paper treatment agent, the content of (C) water is preferably 1 mass% or more, more preferably 5 mass% or more, and further preferably 8 mass% or more. In consideration of production efficiency and the ease of adjusting the viscosity by the type of coater, the content of (C) water is preferably 80 mass% or less, more preferably 50 mass% or less, and further preferably 30 mass% or less.

(D)Other ingredients

Components (D) other than those mentioned above may be added as raw materials to the paper treatment agent of the present invention within a range that does not impair the effects of the present invention. Such other components are not particularly limited, and examples thereof include oily components and surfactants (nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants other than component (B)). , Moisturizing ingredients other than (A) ingredients, thickeners, antifungal agents, preservatives, defoaming agents, fragrances, pigments, pH adjusters, extracts, antioxidants, anti-inflammatory agents, inorganic minerals, inorganic salts and water-soluble polymers, etc. These may be used individually by 1 type, or in combination of 2 or more types.

Oily ingredients

The oily component is mainly used to improve the moist feel with an oily feel and the touch (smoothness) of the surface of the treated paper. Examples of oily components include hydrocarbons, oils and fats, esters, fatty acids, higher alcohols, silicone oils, waxes, steroids, and the like. These may be used individually by 1 type, or in combination of 2 or more types.

Examples of the hydrocarbons include liquid paraffin, paraffin, solid paraffin, light isoparaffin, light liquid isoparaffin, liquid isoparaffin, ozokerite, microcrystalline wax, petrolatum, Squalane, polyethylene wax, polypropylene wax, hydrogenated polyisobutylene, ethylene-α-olefin-co-oligomer, ethylene propylene polymer, etc.

Examples of fats and oils include avocado oil, almond oil, linseed oil, olive oil, cocoa seed oil, perilla seed oil, camellia oil, castor oil, sesame oil, wheat germ oil, rice germ oil, rice bran oil, and tea. Plum oil, safflower oil, soybean oil, evening primrose oil, corn oil, rapeseed oil, peach kernel oil, palm kernel oil, coconut oil, palm oil, tallow, lard, horse fat, mutton fat, shea butter, cocoa seed Butter, turtle oil, mink oil, egg yolk oil, guasline oil, castor oil, sunflower seed oil, jojoba oil, grape seed oil, macadamia nut oil, cottonseed oil, meadowfoam seed oil (Meadowfoam Seed Oil), coconut Oil, peanut oil, cod liver oil, rosehip oil, tallow hardened oil, beef tallow extremely hardened oil, hardened castor oil, palm extremely hardened oil, etc.

Examples of the esters include alkyl stearate, alkyl palmitate, alkyl myristate, alkyl laurate, alkyl behenate, alkyl oleate, and isostearate. Alkyl acid ester, 12-hydroxystearic acid alkyl ester, undecenoic acid alkyl ester, lanolin fatty acid alkyl ester, erucic acid alkyl ester, coconut oil fatty acid alkyl ester, stearyloxystearate Alkyl acid ester, alkyl isononanoate, alkyl dimethyloctanoate, alkyl octanoate, alkyl lactate, alkyl ethylhexanoate, alkyl neopentanoate, alkyl malate Ester, alkyl phthalate, alkyl citrate, alkyl malonate, alkyl adipate, ethylene glycol fatty acid ester, propylene glycol fatty acid ester, butylene glycol fatty acid ester, triglyceride Hydroxymethylpropane fatty acid ester, neopentyritol fatty acid ester, polyglycerol fatty acid ester, trehalose fatty acid ester and pentanediol fatty acid ester, etc.

Examples of fatty acids include stearic acid, palmitic acid, myristic acid, lauric acid, behenic acid, oleic acid, isostearic acid, 12-hydroxystearic acid, undecylenic acid, and lanolin fatty acid. , erucic acid, stearyloxystearic acid, etc.

Examples of higher alcohols include lauryl alcohol, cetyl alcohol, cetearyl alcohol, stearyl alcohol, oleyl alcohol, behenyl alcohol, lanolin alcohol, hexyldecanol, myristyl alcohol, arachidyl alcohol, and plant solids. Alcohol, isostearyl alcohol and octyldodecanol, etc.

Examples of silicone oils include amine-modified silicone oil, epoxy-modified silicone oil, carboxyl-modified silicone oil, polyether-modified oil, polyglycerol-modified silicone oil, dimethyl polysiloxane, and dimethyl silicone. , polyether modified silicone, methyl phenyl silicone, alkyl modified silicone, higher fatty acid modified silicone, methyl hydrogen silicone, fluorine modified silicone, epoxy modified silicone, carboxyl modified silicone Resin-based siloxane, methanol-modified siloxane, amine-modified siloxane, methyl polysiloxane, methylphenyl polysiloxane, silicone resin, dimethyl silicone oil, methyl hydrogen polysiloxane , methyl cyclopolysiloxane, octamethyltrisiloxane, tetramethylhexasiloxane and high polymer methylpolysiloxane, etc.

Examples of waxes include Japanese wax, beeswax, vegetable wax, sumac wax, sugar cane wax, palm wax, montan wax, carnauba wax, candelilla wax, rice bran wax, lanolin, spermaceti wax, reduced lanolin, Liquid lanolin, hard lanolin, ozokerite, paraffin, etc.

Examples of steroids include cholesterol, dihydrocholesterol, cholesterol fatty acid esters, and the like.

surfactant

Among the surfactants, the nonionic surfactant is not particularly limited, and examples thereof include sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene fatty acid esters, and polyoxyethylene. Hydrogenated castor oil, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil fatty acid ester, castor oil fatty acid ester, hydrogenated castor oil fatty acid ester, ethylene glycol fatty acid ester, sucrose fatty acid ester, glycerin fatty acid ester, Diglyceryl fatty acid ester, polyglyceryl fatty acid ester, organic acid monoglyceride, polyethylene glycol fatty acid monoethanolamide, propylene glycol fatty acid ester, polyoxyethylene lanolin alcohol ether, polyoxyethylene alkyl ether, lauric acid Alkanolamide, polyoxyethylene glycerol fatty acid ester, polyoxyethylene hydrogenated castor oil glutamic acid fatty acid diester, pyroglutamic acid fatty acid glyceride, polyoxyethylene glyceryl pyroglutamic acid fatty acid diester, polyether modified Silicone etc.

The anionic surfactant other than component (B) is not particularly limited, and examples thereof include sulfates, phosphates, carboxylates, and the like. The sulfate is not particularly limited, and examples thereof include alkyl sulfate, alkyl sulfate ester salt, alkyl ether sulfate, alkylamide sulfate, polyoxyethylene alkyl ether sulfate, and the like. The phosphate is not particularly limited, and examples thereof include phosphate ester salts, alkyl ether phosphates, alkyl amide phosphates, perfluoroalkyl phosphates, polyoxyethylene alkyl ether phosphates, and alkyl phosphates. wait. The carboxylic acid salt is not particularly limited, and examples thereof include fatty acid salts, N-acyl-amino acid salts (N-acyl-L-glutamate, N-acyl-L-arginine ethyl -DL-pyrrolidone carboxylate, etc.), alkyl ether carboxylate and polyoxyethylene alkyl ether acetate, etc.

The cationic surfactant is not particularly limited, and examples thereof include monoalkyltrimethylammonium salt, dialkyldimethylammonium salt, alkylpyridinium salt, and N,N-diynyloxyethyl -N-methyl, N-hydroxyethylammonium salt, alkylamine salt, stearyldimethylbenzylammonium salt, etc.

The amphoteric surfactant is not particularly limited, and examples thereof include alkyl betaine, fatty acid amide propyl betaine, lauryl hydroxysulfobetaine, and 2-alkyl-N-carboxymethyl-N-hydroxy. Ethyl imidazolinium betaine, lecithin, hydrogenated lecithin, alkyloxyhydroxypropylspermine hydrochloride, lauryl hydroxybetaine, lauryl imino dipropionic acid, undecyl hydroxyethyl Sodium imidazolium betaine, sodium lauryl diacetate, lauryldimethylaminoacetate betaine, N-[3-alkoxy-2-hydroxypropyl]-L-spermine hydrochloride , alkylhydroxysulfobetaine, alkyldimethylamine oxide, sodium alkylamine dipropionate, dihydroxyalkylmethylglycine and sodium lauryldiaminoethylglycinate, etc.

Moisturizing ingredients other than component (A) are not particularly limited, and examples thereof include amino acids, hygroscopic alkalis/acids, and their salts. Examples of amino acids include glycine, valine, leucine, isoleucine, serine, threonine, phenylalanine, arginine, lysine, and aspartic acid, Glutamic acid, cystine, cysteine, methionine and tryptophan. as hygroscopic Examples of bases/acids and their salts include trimethylglycine, betaine, pyrophosphate, potassium pyrophosphate, chondroitin sulfate, potassium pyrophosphate, hyaluronic acid, sodium hyaluronate, sodium metaphosphate, and polyphosphoric acid Potassium, sodium pyrrolidone carboxylate, sodium lactate, sodium chloride, calcium chloride, sodium alginate, sodium polyacrylate, etc. These may be used individually by 1 type, or in combination of 2 or more types.

The content of component (D) is preferably 90 mass% or less, more preferably 70 mass% or less, still more preferably 50 mass% or less, and particularly preferably 30 mass%, relative to the total amount of the paper treatment agent except water. the following.

The paper treatment agent of the present invention can be produced by uniformly mixing each raw material according to a conventional method. For example, it can be obtained by stirring and mixing at a temperature that dissolves each raw material.

The paper treatment agent of the present invention may be prepared by mixing the component (A), the component (B) and the component (C) uniformly. When the component (D) is also prepared, the component (A), the component (B), and the component (C) may be mixed uniformly. Components (B), (C) and (D) may be mixed uniformly. For example, they may be in a molten state, a soluble state, an emulsified state, or a dispersed state.

The paper treatment agent of the present invention contains components (A), (B) and (C). It has a low viscosity before coating the paper, and accordingly retains moisture on the coated paper appropriately after coating the paper. and exert the effect of the present invention. Since the paper treatment agent of the present invention has a low viscosity, it is easy to transfer and has good handling ability. It is easy to manage the amount of treatment agent adhering to the treated paper and has good operability. The paper treatment agent is also excellent in its uniform coating properties on paper, which is related to the feel of the paper.

The paper treatment agent of the present invention preferably has a viscosity of less than 2000 mPa when measured using a B-type viscometer at 60 rpm and 40°C. s. Better still is less than 500mPa. s.

Furthermore, the paper treatment agent of the present invention has high stability in maintaining a uniform state over time. That is, the paper treatment agent has good stability over time and can appropriately maintain its viscosity even over a long period of time.

Preferable examples of the paper treatment agent of the present invention include those containing 50 mass % or more and 98 mass % or less of component (A) based on the total amount of the paper treatment agent excluding water, and containing 0.7 % by mass or more and 7.9% by mass or less of an alkyl sulfonate having an alkyl group with a carbon number of 12 to 26 as component (B), and 5% by mass or more and less with respect to the total amount of the paper treatment agent A paper treatment agent containing 50 mass % or less of component (C); containing 50 mass % or more and 98 mass % or less of component (A) relative to the total amount of paper treatment agents excluding water, and containing 0.7 mass % More than 7.9% by mass of an alkyl benzene sulfonate having an alkyl group with a carbon number of 12 to 26, and 5% by mass or more and less than 50% by mass (C ) component of the paper treatment agent; containing 50 mass % or more and 98 mass % or less of component (A), and 0.7 mass % or more and 7.9 mass % or less based on the total amount of the paper treatment agent except water. The component (B) is a sulfosuccinate salt having an alkyl group having 12 to 26 carbon atoms, and contains 5 mass % or more and 50 mass % or less of component (C) with respect to the total amount of the paper treatment agent. Paper treatment agents, etc.

(paper)

The paper of the present invention is paper treated with the paper treatment agent described above. By using paper treated with the paper treatment agent of the present invention, it is possible to provide paper with a unique slippery feel and coreless softness like silk, and it can be used under high humidity environmental conditions and low temperature. The moisture content of paper changes little under humid environmental conditions, and the evaporation of water in paper can be suppressed even under low-humidity environmental conditions.

Examples of paper include facial tissue, toilet paper, facial tissues, handkerchiefs, paper handkerchiefs, and paper towels.

The weight per unit area of paper is not particularly limited, but is preferably 1 to 50 g/m ² , more preferably 5 to 20 g/m ² . The number of Ply (number of laminated sheets of base paper) is not particularly limited, but is preferably 1 to 5, more preferably 2 to 3.

The method of treating paper with the paper treatment agent is not particularly limited, and examples thereof include a method of applying the paper treatment agent to paper. There is no particular limitation on the method of coating on paper, and examples include transfer, spraying, and the like. Examples of coating methods on paper using these methods include flexographic printing, gravure printing, spray coating, and rotor damping. In the flexographic printing method, a flexographic printing machine, which is a type of relief printing machine, is used to transfer the paper treatment agent to the paper using a roller equipped with a printing plate such as rubber or synthetic resin with an engraved surface. In the gravure printing method, a gravure printing machine, which is a gravure printing machine, is used, and a paper treatment agent is transferred to the paper using a roller attached to a metal cylinder with plate making on the surface. In the spraying method, compressed air is used to spray the paper treatment agent onto the paper in a mist form from a nozzle. In the rotor damping method, a high-speed rotating disk is used to spray the paper treatment agent onto the paper in a mist form.

The coating amount of the paper treatment agent on paper is not particularly limited, but is preferably 1 to 7 g/m ² and more preferably 1.5 to 6 g/m ² in terms of the mass of the paper treatment agent excluding water.

(Methods to improve the feel of paper)

The method for improving the feel of paper according to the present invention is characterized by treating it with the paper treatment agent described above. The specific method of using the paper treatment agent to treat paper is as described above. By treating paper with the paper treatment agent of the present invention, it is possible to impart a specific slippery feel like silk and a less fluffy and loose touch to the paper, while reducing the burden on the skin and reminding people of the paper. Coreless softness that is gentle on the skin, thereby improving the feel.

[Example]

Hereinafter, the present invention will be described in further detail using examples, but the present invention is not limited to these examples.

(1) Preparation of paper treatment agent

Follow the steps below to prepare paper treatment.

Each prepared raw material was added to a beaker in the addition amount described in Table 1 to Table 5, and stirred and mixed at a temperature at which each raw material was dissolved, to prepare a paper treatment agent. The compounding amounts of each component shown in Tables 1 to 5 represent active ingredients that do not contain moisture when the total amount contains moisture. It should be noted that the total water content is included in the water addition amount in the table.

(2) Preparation of coated paper

The paper treatment agent obtained by the above method is evenly coated on the dry paper towel (ply number is 2, unit The area weight is 12 to 14g/m ² ) on both sides of the surface, and then air-dried for 3 hours.

(3)Evaluation

The paper treatment agents and coated papers of each of the Examples and Comparative Examples prepared above were evaluated as follows.

[Special smoothness like silk (sensory evaluation)]

As a sensory evaluation, the coated paper prepared according to the step (2) above was evaluated by 10 skilled panelists based on the following evaluation points, with any score from 1 to 3, and the average value was The following standards evaluate the unique smooth feeling like silk.

Evaluation points

3 points: Feel the smoothness like silk

2 points: Somewhat smooth and smooth like silk.

1 point: Unable to feel the smoothness as special as silk.

evaluation benchmark;

◎+: The average score of the 10 panel members is 2.5 or above

◎: The average score of the 10 panel members is 2.0 or more but less than 2.5

○: The average score of the 10 panel members is more than 1.5 and less than 2.0

×: The average score of the 10 panel members did not reach 1.5 points.

[Coreless softness (sensory evaluation)]

As a sensory evaluation, 10 skilled panelists evaluated the coated paper produced in the above step (2) based on the following evaluation points with any score from 1 to 3, and based on the average value, the following criteria were used: Evaluate the coreless softness.

Evaluation points

3 points: Feel the coreless softness

2 points: Slightly feel the coreless softness

1 point: The coreless softness cannot be felt.

evaluation benchmark;

◎+: The average score of the 10 panel members is 2.5 or above

◎: The average score of the 10 panel members is between 2.0 and less than 2.5

○: The average score of the 10 panel members is more than 1.5 and less than 2.0

×: The average score of the 10 panel members was less than 1.5 points.

[Coreless softness (T ₀ /T _m value)]

As a test instrument, a KES-G5 handheld compression testing machine (manufactured by Jado Technology Co., Ltd.) was used to measure T ₀ : thickness (mm) and Tm of two coated papers (1 set) under a load of 0.5 gf/cm ² : Thickness (mm) at load 50gf/ ^cm2 .

The lower the T ₀ /T _m value, which is the ratio of the T ₀ value to the T _m value, it means that there is no difference in thickness between when no load is applied and when a load is applied, and the coated paper can be less bulky and loose. The T ₀ /T _m value indicating the relaxation of the paper is related to the coreless softness in the above sensory evaluation. The lower the T ₀ /T _m value, the more coreless softness can be felt. Therefore, based on the T ₀ /T _m value, coreless softness was evaluated based on the following criteria.

Evaluation benchmark

◎+: T ₀ /T _m value is less than 1.8

◎: T ₀ /T _m value is 1.8 or more and less than 2.0

○: T ₀ /T _m value is 2.0 or more and less than 2.2

×: The T ₀ /T _m value is 2.2 or more.

[Humidity environment dependence]

For the coated paper prepared according to the above step (2), measure the quality of the paper after standing for 24 hours under the environmental conditions of 40% RH and 70% RH and 25°C, and the quality of the paper after standing for 1.5 hours at 80°C. Dry quality, and calculate the proportion of water relative to the completely dry mass of paper at 40% RH and 70% RH at 25°C based on the aforementioned values.

Based on this value, the difference in the ratio of water to the mass of paper that is completely dry at 25°C, 40%RH and 25°C, 70%RH is calculated, and the humidity environment dependence is evaluated based on the following criteria. Evaluation.

Evaluation benchmark

◎+: The difference in the mass ratio of water to the completely dry mass of paper at 40% RH and 70% RH is less than 7.0%;

◎: The difference in the ratio of water to the mass of paper completely dried at 40% RH and 70% RH is 7.0% or more and less than 8.0;

○: The difference in the mass ratio of water to the completely dry mass of paper at 40% RH and 70% RH is 8.0% or more and less than 9.0%;

×: The difference in the proportion of water to the mass of paper completely dried in the case of 40% RH and in the case of 70% RH exceeds 9.0%.

[Moisture content under low humidity environmental conditions]

For the coated paper prepared according to the above step (2), measure the mass of the paper after it has been left to stand for 24 hours under the environmental conditions of 25% RH and 25°C, and the quality of the paper after it has been left to stand for 1.5 hours at 80°C and is completely dry. Calculate the ratio of water to the mass of paper that is completely dry under 25%RH and 25°C, and use it as the moisture content under 25%RH conditions. According to the following standards, the content under low humidity environmental conditions is Evaluate water volume.

Evaluation benchmark

◎+: The moisture content under 25%RH is more than 5.1%;

◎: Moisture content under 25%RH conditions is more than 4.7% and less than 5.1%;

○: Moisture content under 25%RH conditions is more than 4.5% and less than 4.7%;

×: The moisture content under 25%RH conditions is less than 4.5%.

[Viscosity of paper treatment agent]

Using a B-type viscometer, measure the viscosity of the paper treatment agent prepared according to the above step (1) at 60 rpm and 40°C, and evaluate it according to the following standards.

Evaluation benchmark

◎: The viscosity of paper treatment agent is less than 500mPa. s;

○: The viscosity of paper treatment agent is 500mPa. s or more and less than 2000mPa. s;

×: The viscosity of the paper treatment agent is 2000mPa. s or more or cannot be measured (failure to maintain a uniform state).

[Stability of paper treatment agents]

The paper treatment agent prepared according to the above-mentioned step (1) was evaluated according to the following criteria by confirming its state immediately after preparation and when it was stored at room temperature for 1 month, and considering suitability for actual use.

Evaluation benchmark

◎: The uniform state remains even after one month after preparation;

○: The state changed slightly from the time of preparation to 1 month later, but it still maintained a uniform state;

×: It is not uniform immediately after preparation, or the uniform state is not maintained for one month.

The preparations of each Example and Comparative Example and the evaluation results of each item are shown in Tables 1 to 5. In Tables 1 to 5, the amounts of each component are expressed in parts by mass.

In the evaluation of each item in Tables 1 to 5, specific smoothness like silk (sensory evaluation), coreless softness (sensory evaluation), coreless softness (T ₀ /T _m value) ), humidity environment dependence, and moisture content under low-humidity environmental conditions, ○, ◎, and ◎+ indicate good performance in solving the problem of the present invention, and indicate the degree of good performance in this order. In addition, in these evaluations, if all have one or more ×, it is judged that the problem of the present invention cannot be solved.

In the table, C in (B) sulfonate represents the number of carbon atoms in the alkyl group.

[Table 1]

[Table 2]

[table 3]

[Table 4]

[table 5]

It can be seen from Tables 1 to 5 that Examples 1 to 35 used a paper treatment agent, which contained (A) polyol, (B) sulfonate and (C) water, in which (B) sulfonate The content of the acid salt is 0.05% by mass or more and less than 8.0% by mass relative to the total amount except water. These paper treatment agents have a unique slippery feel and coreless softness like silk, and have little dependence on humidity environments, and can suppress water evaporation from paper even in low-humidity environmental conditions. The paper treatment agent has low viscosity and has good stability over time. In addition, since the coreless softness of coated paper with a low T _{0 /} T _m value, less fluffy feeling, and looseness is good in sensory evaluation, it can be confirmed that the T ₀ /T _m value is related to the coreless softness in sensory evaluation. .

Comparative Example 1 blended components (A) and (C), but did not blend component (B); Comparative Example 2 blended component (B), but the blending amount was large; Comparative Examples 3 and 4 blended (B). ) component and (C) component, but component (A) was not blended; Comparative Examples 5 and 6 blended other anionic surfactants to replace component (B); Comparative Examples 7 to 9 blended (A) Ingredients and (B) ingredient, but (C) ingredient is not blended. None of these comparative examples achieved the same effects as the examples.

Claims (4)

A paper treatment agent containing (A) polyol, (B) sulfonate and (C) water, wherein, The content of (B) sulfonate is 0.05% by mass or more and less than 8.0% by mass relative to the total amount except water. The paper treatment agent as described in claim 1, wherein, The aforementioned (B) sulfonate has an alkyl group having 4 to 30 carbon atoms. Paper treated with the paper treatment agent described in claim 1 or 2. A method of improving the feel of paper is to treat paper with the paper treatment agent described in claim 1 or 2.