WO2024185166A1 - Paper treatment agent, paper using same, and method for improving texture of paper - Google Patents

Abstract

Provided are: a paper treatment agent whereby a gel is formed on paper when applied thereto, moisture originating from the treatment agent is retained by the paper, and the smooth and slippery feel characteristic of gels can thus be imparted to the paper; a paper using the paper treatment agent; and a method for improving the texture of paper.　The paper treatment agent contains (A) a polyalcohol, (B) at least one substance selected from among alkyl phosphate ester salts and polyoxyalkylene alkyl ether phosphate ester salts in which an alkyl group has 6-28 carbon atoms, and (C) water. The content of (C) water is greater than 10 mass% and less than 40 mass%.

Description

Paper treatment agent, paper using the same, and method for improving paper texture

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

Toilet paper, tissues, and other papers require a soft, moist feel, and papers treated with paper treatment agents containing moisturizing ingredients, such as moisturizing tissues that have a soft feel, are widely used throughout the year. To give these papers, such as moisturizing tissues, a paper treatment agent containing a polyhydric alcohol such as glycerin is applied to give them flexibility.

Among papers treated with paper treatment agents containing moisturizing ingredients, moisturizing tissues are often used for blowing the nose, and to reduce the burden on the skin, products with a good texture, such as reduced surface friction, are required. It is desirable to give papers with moisturizing properties a texture that suits the user's preferences as a commercial product.

In order to solve the technical problem of improving the soft and moist texture, various measures have been taken in the past. For example, Patent Document 1 aims to improve the moist feeling by utilizing the water absorption properties of hydrophilic polymers, but water-soluble polymers require time and effort to disperse uniformly, which complicates the drug manufacturing process. In addition, water-soluble polymers cause significant thickening, so the amount of water-soluble polymers used must be limited. Patent Document 2 aims to improve the moist feeling by using a drug to which glycerin and 1,3-propanediol are added, but the effect is insufficient. Patent Document 3 aims to improve the texture by using straight-chain alcohols or fatty acids and anionic surfactants, but no study was conducted focusing on the structure of alkyl phosphate ester salts, leaving room for improvement. Patent Documents 4 and 5 aim to improve the texture by using alkyl phosphate ester salts, but no study was conducted on the water content in the drug, and the effect was insufficient.

Patent Document 6 proposes a drug made of a gel composition, but it is difficult to uniformly soak tissue paper as is, and requires complicated processes such as heating and diluting to make it fluid, as well as an extended drying time for the diluted water. In addition, the texture of the coated paper is not satisfactory.

Patent Document 7 proposes preparing an emulsion of cosmetics or the like in advance, and using this as a raw material to manufacture a drug, thereby producing a drug that is highly stable and has a good texture.

JP 2009-263837 A JP 2016-193042 A JP 2019-099938 A JP 2014-065986 A JP 2009-243022 A JP 2007-203089 A JP 2020-204142 A

However, in Patent Document 7, it was necessary to manufacture an emulsion-type cosmetic and a drug, which made the process complicated and required a long time for production. In the field of paper treatment agents containing moisturizing ingredients, a gel is not formed before application to the paper, and no technology has been considered to impart texture by forming a gel on the paper after application. The inventors focused on the fact that certain surfactants can form a gel after application to paper, and conducted research based on the idea that this could create a texture that had never been seen before. However, there was a risk that the formulation and amount of emulsion-type cosmetic added could inhibit gel formation on the paper, making it impossible to obtain the smooth, slippery feel that is characteristic of gel.

The present invention was made in consideration of the above circumstances, and aims to provide a paper treatment agent that forms a gel on the paper to which it is applied, thereby retaining the moisture from the treatment agent in the paper and imparting the smooth, slippery feel characteristic of gels, as well as paper using the same and a method for improving the texture of paper.

In order to solve the above problems, the inventors conducted extensive research and discovered that a paper treatment agent containing a polyhydric alcohol, at least one selected from an alkyl phosphate ester salt and a polyoxyalkylene alkyl ether phosphate ester salt having a specific range of alkyl group carbon numbers, and a specific range of water, gels on paper, and that the gel is unique and distinctive from other gels, imparting a smooth, slippery feel to the paper, which led to the completion of the present invention.

That is, in order to solve the above problems, the paper treatment agent of the present invention contains (A) a polyhydric alcohol, (B) at least one selected from alkyl phosphate salts and polyoxyalkylene alkyl ether phosphate salts, each having an alkyl group with 6 to 28 carbon atoms, and (C) water, and is characterized in that the water content of (C) is more than 10% by mass and less than 40% by mass.
The paper of the present invention is characterized by being treated with the paper treating agent.
The method for improving the feel of paper of the present invention is characterized by treating paper with the paper treating agent.
The method for producing a paper treating agent of the present invention is characterized by including a step of adding the above-mentioned components (A) to (C).

The paper treatment agent of the present invention, due to the specific combination of the contents of the above-mentioned components (A), (B), (C), and (D), forms a unique and distinctive gel on the paper to which it is applied, and the moisture from the treatment agent is retained by the paper, imparting a moist texture and the smooth, slippery feel characteristic of the gel.

According to the present invention, the treatment agent forms a unique and distinctive gel on the paper to which it is applied, which allows the moisture from the treatment agent to be retained by the paper, imparting a smooth, slippery feel characteristic of gel. These effects are remarkable and go beyond the range of effects that a person skilled in the art could have predicted from the configuration of the present invention.

The present invention will be described in detail below.
In the present invention and in the following description, the term "feel" particularly includes the smooth, slippery feel that is characteristic of gel.

(Paper treatment agent)
The paper treatment agent of the present invention contains (A) a polyhydric alcohol, (B) at least one selected from an alkyl phosphate salt and a polyoxyalkylene alkyl ether phosphate salt, each of which has an alkyl group with 6 to 28 carbon atoms, and (C) water, and it is essential that the content of water (C) is more than 10% by mass and less than 40% by mass.

(A) Polyhydric Alcohol The polyhydric alcohol of component (A) in the paper treating agent of the present invention is a moisturizing agent that enhances the hygroscopicity and moisture retention of paper and imparts a moist feel and softness to the paper.

The polyhydric alcohol of component (A) is not particularly limited, but 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 glycerin ether, isoprene glycol, pentaerythritol, and trimethylolpropane.
Also, sugar alcohols or saccharides may be used, and examples of sugar alcohols include sorbitol, inositol, glucosyltrehalose, xylitol, erythritol, mannitol, lactitol, fructose, oligosaccharide alcohol, maltitol, reduced palatinose, reduced starch syrup, reduced starch hydrolysate, etc. Examples of saccharides include fructose, glucose, lactose, xylose, psicose, maltose, starch syrup, oligosaccharide, maltose, trehalose, lactose, palatinite, sucrose, isomerized sugar, isomaltooligosaccharide, fructooligosaccharide, galactooligosaccharide, xylooligosaccharide, lactofructose oligosaccharide, soybean oligosaccharide, raffinose, stevia, licorice, saccharin, aspartame, acesulfame K, sucralose, etc.
These may be used alone or in combination of two or more.
Among these, glycerin, 1,3-butanediol, 1,2-propanediol, and sorbitol are preferable, and glycerin is more preferable.

The content of (A) polyhydric alcohol is not particularly limited, but may be, for example, 1% by mass or more relative to the total amount of the paper treatment agent. From the viewpoint of improving the texture of the paper coated with (A) polyhydric alcohol by moisture absorption, the content is preferably 10% by mass or more relative to the total amount of the paper treatment agent, more preferably 20% by mass or more, even more preferably 40% by mass or more, even more preferably 60% by mass or more, even more preferably 70% by mass or more, particularly preferably 75% by mass or more, and most preferably 80% by mass or more. From the viewpoint of improving the texture specific to the present invention, the content is preferably 89% by mass or less relative to the total amount of the paper treatment agent, more preferably 85% by mass or less. From the viewpoint of improving the texture specific to the present invention, the content is preferably 10 to 89% by mass, more preferably 20 to 89% by mass, and even more preferably 40 to 89% by mass.

(B) Alkyl phosphate salt or polyoxyalkylene alkyl ether phosphate salt in which the alkyl group has 6 to 28 carbon atoms In the paper treatment agent of the present invention, the alkyl phosphate salt or polyoxyalkylene alkyl ether phosphate salt in which the alkyl group has 6 to 28 carbon atoms, which is component (B), is blended together with (A) a polyhydric alcohol, and further contains more than 10% by mass and less than 40% by mass of (C) water, thereby forming a unique and characteristic gel on the paper and imparting the smooth, slippery feel characteristic of the gel to the paper.

The number of carbon atoms in the alkyl group of component (B) is not particularly limited as long as it is 6 to 28, but from the viewpoint of imparting an appropriate hardness to the gel formed by the treatment agent on the coated paper, the number of carbon atoms in the alkyl group is preferably 10 or more, more preferably 12 or more, and even more preferably 14 or more. From the viewpoint of imparting an appropriate softness to the gel formed by the treatment agent on the coated paper, the number of carbon atoms in the alkyl group is preferably 24 or less, more preferably 22 or less, and even more preferably 20 or less. Furthermore, 8 to 24 is preferable, 8 to 20 is more preferable, and 12 to 18 is even more preferable. The alkyl group may be either saturated or unsaturated, and may be either straight-chain or branched.

(B) The alkyl phosphate salt in the present invention is obtained by neutralizing a phosphate obtained by reacting an alcohol having an alkyl group with a phosphating agent. The polyoxyalkylene alkyl ether phosphate salt in the present invention can be obtained, for example, by adding an alkylene oxide to an alcohol to form an alkylene oxide adduct, reacting this with a phosphating agent to obtain a phosphate ester, and neutralizing the resulting phosphate ester, or by adding an alkylene oxide to a phosphate ester obtained by reacting an alcohol with a phosphating agent, and neutralizing the resulting phosphate ester.
Examples of the alkylene oxide to be added to the alcohol include ethylene oxide, propylene oxide, butylene oxide, etc., with ethylene oxide and propylene oxide being preferred. When obtaining an alkylene oxide adduct of alcohol, two or more different alcohols and alkylene oxides can be mixed and used. When two or more different alkylene oxides are added, the alkylene oxides may be added randomly or in blocks. The degree of addition polymerization of the alkylene oxide to the alcohol is not particularly limited, but from the viewpoint of imparting an appropriate hardness to the gel formed by the treatment agent on the coated paper, it is preferably 30 or less, more preferably 20 or less, even more preferably 10 or less, even more preferably 5 or less, and particularly preferably 3 or less.
Examples of the phosphorylating agent to be reacted with the above alcohol or the alkylene oxide adduct of the alcohol include phosphorus pentoxide and phosphoryl chloride.
The phosphoric esters obtained by reacting alcohol with a phosphorylating agent include monoesters, diesters, and triesters, and the content ratios of monoesters, diesters, and triesters in the reaction product can be adjusted by the reaction ratio of alcohol and phosphorylating agent, reaction time, etc. Usually, the reaction product obtained by reacting alcohol with a phosphorylating agent is obtained as a mixture of monoesters, diesters, and triesters, but it is only monoesters and diesters that can be further reacted with alkylene oxide. However, even if triester is present in the reaction product, it can be reacted with alkylene oxide without separating and removing the triester, and there is no problem even if the treatment agent contains triester.
When the phosphoric acid ester obtained by reacting an alcohol with a phosphorylating agent is a diester, the residues of the alcohol esterified and bonded to the phosphoric acid may be the same or different.
As the alkylene oxide to be further reacted with the phosphoric acid ester obtained by reacting the alcohol with the phosphorylating agent, ethylene oxide, propylene oxide, butylene oxide, etc. are used as the alkylene oxide to be added to the alcohol, but ethylene oxide and propylene oxide are preferred. The degree of addition polymerization of the alkylene oxide to the phosphoric acid ester of the alcohol is not particularly limited, but from the viewpoint of imparting an appropriate hardness to the gel formed by the treatment agent on the coated paper, it is preferably 30 or less, more preferably 20 or less, even more preferably 10 or less, even more preferably 5 or less, and particularly preferably 3 or less.

Straight-chain or branched, saturated or unsaturated alkyl phosphate salts include, for example, hexyl phosphate salts, octyl phosphate salts, 2-ethylhexyl phosphate salts, nonyl phosphate salts, decyl phosphate salts, isodecyl phosphate salts, undecyl phosphate salts, lauryl phosphate salts, isolauryl phosphate salts, tridecyl phosphate salts, isotridecyl phosphate salts, myristyl phosphate salts, isomyristyl phosphate salts, pentadecyl phosphate salts, isopentadecyl phosphate salts, cetyl phosphate salts, hexyldecyl phosphate salts, heptadecyl phosphate salts, stearyl phosphate salts, isostearyl phosphate salts, oleyl phosphate salts, nonadecyl phosphate salts, arachidyl phosphate salts, octyldodecyl phosphate salts, behenyl phosphate salts, lignoceryl phosphate salts, decyltetradecyl phosphate salts, ceryl phosphate salts, and montanyl phosphate salts.

Examples of polyoxyalkylene alkyl ether phosphate ester salts include polyoxyethylene hexyl ether phosphate ester salts (POE(1) to POE(30)), polyoxyethylene octyl ether phosphate ester salts (POE(1) to POE(30)), polyoxyethylene 2-ethylhexyl ether phosphate ester salts (POE(1) to POE(30)), polyoxyethylene decyl ether phosphate ester salts (POE(1) to POE(30)), polyoxyethylene isodecyl ether phosphate ester salts (POE(1) to POE(30)), polyoxyethylene lauryl ether phosphate ester salts (POE( 1) to POE(30)), polyoxyethylene isolauryl alcohol ether phosphate salts (POE(1) to POE(30)), polyoxyethylene tridecyl ether phosphate salts (POE(1) to POE(30)), polyoxyethylene myristyl ether phosphate salts (POE(1) to POE(30)), polyoxyethylene isomyristyl ether phosphate salts (POE(1) to POE(30)), polyoxyethylene pentadecyl ether phosphate salts (POE(1) to POE(30)), polyoxyethylene isopentadecyl alcohol ether phosphate salts (POE(1) to POE (30)), polyoxyethylene cetyl ether phosphate salts (POE (1) to POE (30)), polyoxyethylene hexyldecyl ether phosphate salts (POE (1) to POE (30)), polyoxyethylene stearyl ether phosphate salts (POE (1) to POE (30)), polyoxyethylene isostearyl ether phosphate salts (POE (1) to POE (30)), polyoxyethylene oleyl ether phosphate salts (POE (1) to POE (30)), polyoxyethylene nonadecyl ether phosphate salts (POE (1) to POE (30)), polyoxyethylene arachidyl ether Phosphate ester salts (POE(1) to POE(30)), polyoxyethylene octyldodecyl ether phosphate ester salts (POE(1) to POE(30)), polyoxyethylene behenyl ether phosphate ester salts (POE(1) to POE(30)), polyoxyethylene lignoceryl ether phosphate ester salts (POE(1) to POE(30)), polyoxyethylene decyltetradecyl ether phosphate ester salts (POE(1) to POE(30)), polyoxyethylene ceryl ether phosphate ester salts (POE(1) to POE(30)), polyoxyethylene montanyl ether phosphate ester salts (POE(1) to POE(30)) 30)), polyoxypropylene hexyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene octyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene 2-ethylhexyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene decyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene isodecyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene lauryl ether phosphate salts (POP(1) to POP(30)), polyoxyethylene isolauryl ether phosphate salts of polyoxyethylene tridecyl alcohol (POP(1) to POP(30)), polyoxypropylene tridecyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene myristyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene isomyristyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene pentadecyl ether phosphate salts (POP(1) to POP(30)), polyoxyethylene tridecyl alcohol ether phosphate salts (POP(1) to POP(30)), polyoxypropylene cetyl ether phosphorus Acid ester salts (POP(1) to POP(30)), polyoxypropylene hexyldecyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene stearyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene isostearyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene oleyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene nonadecyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene arachidyl ether phosphate salts (POP(1) to POP(30)). P(30)), polyoxypropylene octyldodecyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene behenyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene lignoceryl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene decyltetradecyl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene ceryl ether phosphate salts (POP(1) to POP(30)), polyoxypropylene montanyl ether phosphate salts (POP(1) to POP(30)), etc. The numbers in parentheses indicate the number of polyoxyethylene (POE) or polyoxypropylene (POP) units.

The salt constituting component (B) is not particularly limited, but examples thereof include alkali metal salts, amine salts, and ammonium salts. The alkali metal salts are not particularly limited, but examples thereof include sodium salts and potassium salts. The amine salts are not particularly limited, but examples thereof include salts derived from amine compounds.

The content of component (B) is not particularly limited, but from the viewpoint of improving the texture in the present invention, it is preferably more than 0.05% by mass, more preferably more than 0.15% by mass, even more preferably more than 0.5% by mass, and even more preferably more than 1.0% by mass, based on the total amount of the paper treatment agent. In addition, in order for the treatment agent to form a unique and characteristic gel on the coated paper, it is preferably 70% by mass or less, more preferably 40% by mass or less, and even more preferably 20% by mass or less, based on the total amount of the paper treatment agent. In addition, it is preferably more than 0.05% by mass and less than 70% by mass, more preferably more than 0.15% by mass and less than 70% by mass, even more preferably more than 0.5% by mass and less than 70% by mass, and even more preferably more than 0.5% by mass and less than 40% by mass, based on the total amount of the paper treatment agent.

(C) Water In the paper treatment agent of the present invention, water, as component (C), is an essential component for achieving the effects of the present invention when combined with the alkyl phosphate salt or polyoxyalkylene alkyl ether phosphate salt, as component (B).
The water of component (C) is not particularly limited, but examples thereof include ion-exchanged water, tap water, and sterilized water.

(C) The water content is more than 10% by mass and less than 40% by mass relative to the total amount of the paper treatment agent, but from the viewpoint of imparting appropriate softness to the gel that the treatment agent forms on the coated paper, it is preferably 11% by mass or more, more preferably 15% by mass or more, and even more preferably 20% by mass or more. From the viewpoint of imparting appropriate hardness to the gel that the treatment agent forms on the coated paper, it is preferably 39% by mass or less, more preferably 30% by mass or less, and even more preferably 25% by mass or less. Also, it is preferably more than 10% by mass and less than 39% by mass, more preferably more than 10% by mass and less than 30% by mass, and even more preferably more than 10% by mass and less than 25% by mass.

The mass ratio of component (B) to component (C) in the paper treatment agent of the present invention (component (B)/component (C)) is preferably 0.001 or more, more preferably 0.01 or more, and even more preferably 0.05 or more, so that the treatment agent forms a unique and characteristic gel on the coated paper. Similarly, in order for the treatment agent to form a unique and characteristic gel on the coated paper, it is preferably 8 or less, more preferably 5 or less, and even more preferably 2 or less. It is preferably 0.001 to 8, more preferably 0.01 to 8, even more preferably 0.01 to 5, and even more preferably 0.1 to 5.

(D) Other Components Other components (D) than those described above can be added as raw materials to the paper treatment agent of the present invention within the scope of not impairing the effects of the present invention. Such other components are not particularly limited, but include, for example, oil components, surfactants (nonionic surfactants, anionic surfactants other than component (B), cationic surfactants, and zwitterionic surfactants), moisturizing components other than component (A), thickeners, antifungal agents, preservatives, antifoaming agents, fragrances, dyes, pH adjusters, extracts, antioxidants, anti-inflammatory agents, inorganic minerals, inorganic salts, water-soluble polymers, etc. These may be used alone or in combination of two or more.

Oil-based components The oil-based components mainly improve the texture, such as the moist feeling of oiliness and the surface feel (smoothness) of treated paper. Examples of oil-based components include hydrocarbons, oils and fats, esters, fatty acids, higher alcohols, silicone oils, waxes, steroids, etc. These may be used alone or in combination of two or more.

Examples of hydrocarbons include liquid paraffin, paraffin, solid paraffin, light isoparaffin, light liquid isoparaffin, liquid isoparaffin, ceresin, microcrystalline wax, petrolatum, squalane, polyethylene wax, polypropylene wax, hydrogenated polyisobutene, ethylene-α-olefin co-oligomer, ethylene propylene polymer, etc.

Examples of fats and oils include avocado oil, almond oil, linseed oil, olive oil, cacao oil, perilla oil, camellia oil, castor oil, sesame oil, wheat germ oil, rice germ oil, rice bran oil, sasanqua oil, safflower oil, soybean oil, evening primrose oil, camellia oil, corn oil, rapeseed oil, persic oil, palm kernel oil, coconut oil, palm oil, beef tallow, lard, horse tallow, mutton tallow, shea butter, cacao butter, turtle oil, mink oil, egg yolk oil, parcelin oil, castor oil, sunflower oil, jojoba oil, grapeseed oil, macadamia nut oil, cottonseed oil, meadowhoo oil, coconut oil, peanut oil, cod liver oil, rosehip oil, hardened beef tallow oil, highly hardened beef tallow oil, hardened castor oil, highly hardened palm oil, etc.

Esters include, for example, alkyl esters of stearate, alkyl esters of palmitate, alkyl esters of myristic acid, alkyl esters of laurate, alkyl esters of behenic acid, alkyl esters of oleic acid, alkyl esters of isostearate, alkyl esters of 12-hydroxystearic acid, alkyl esters of undecylenic acid, alkyl esters of lanolin fatty acid, alkyl esters of erucic acid, alkyl esters of coconut oil fatty acid, alkyl esters of stearoyloxystearic acid, alkyl esters of isononanoic acid, alkyl esters of dimethyloctanoic acid, alkyl esters of octanoic acid, alkyl esters of lactate, alkyl esters of ethylhexanoic acid, alkyl esters of neopentanoic acid, alkyl esters of malic acid, alkyl esters of phthalic acid, alkyl esters of citric acid, alkyl esters of malonic acid, alkyl esters of adipic acid, alkyl esters of ethylene glycol fatty acid, esters of propanediol fatty acid, esters of butanediol fatty acid, esters of trimethylolpropane fatty acid, esters of pentaerythritol fatty acid, esters of polyglycerin fatty acid, esters of trehalose fatty acid, and esters of pentylene glycol fatty acid.

Fatty acids include, for example, stearic acid, palmitic acid, myristic acid, lauric acid, behenic acid, oleic acid, isostearic acid, 12-hydroxystearic acid, undecylenic acid, lanolin fatty acid, erucic acid, and stearoyloxystearic acid.

Examples of higher alcohols include lauryl alcohol, cetyl alcohol, cetostearyl alcohol, stearyl alcohol, oleyl alcohol, behenyl alcohol, lanolin alcohol, hexyldecanol, myristyl alcohol, arachyl alcohol, phytosterol, isostearyl alcohol, and octyldodecanol.

Examples of silicone oils include amino-modified silicone oil, epoxy-modified silicone oil, carboxyl-modified silicone oil, polyether-modified oil, polyglycerin-modified silicone oil, dimethylpolysiloxane, dimethylsilicone, polyether-modified silicone, methylphenylsilicone, alkyl-modified silicone, higher fatty acid-modified silicone, methylhydrogensilicone, fluorine-modified silicone, epoxy-modified silicone, carboxy-modified silicone, carbinol-modified silicone, amino-modified silicone, methylpolysiloxane, methylphenylpolysiloxane, silicone resin, dimethicone, methylhydrogenpolysiloxane, methylcyclopolysiloxane, octamethyltrisiloxane, tetramethylhexasiloxane, highly polymerized methylpolysiloxane, etc.

Examples of waxes include Japan wax, beeswax, hazel wax, urushi wax, sugar cane wax, palm wax, montan wax, carnauba wax, candelilla wax, rice bran wax, lanolin, spermaceti, reduced lanolin, liquid lanolin, hard lanolin, ceresin, and ozokerite.
Examples of steroids include cholesterol, dihydrocholesterol, cholesterol fatty acid esters, and the like.

Surfactant Among the surfactants, nonionic surfactants include, but are not limited to, for example, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene fatty acid esters, polyoxyethylene hydrogenated castor oil, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil fatty acid esters, castor oil fatty acid esters, hydrogenated castor oil fatty acid esters, ethylene glycol fatty acid esters, sucrose fatty acid esters, glycerin fatty acid esters, diglycerin fatty acid esters, polyglycerin fatty acid esters, organic acid monoglycerides, polyethylene glycol fatty acid monoethanolamides, propylene glycol fatty acid esters, polyoxyethylene lanolin alcohol ethers, polyoxyethylene alkyl ethers, lauric acid alkanolamides, polyoxyethylene glycerin fatty acid esters, polyoxyethylene hydrogenated castor oil pyroglutamic acid fatty acid diesters, pyroglutamic acid fatty acid glyceryl, polyoxyethylene glyceryl pyroglutamic acid fatty acid diesters, and polyether-modified silicones.

Anionic surfactants other than component (B) include, but are not limited to, sulfates, sulfonates, carboxylates, etc. Sulfates include, but are not limited to, alkyl sulfates, alkyl sulfate ester salts, alkyl ether sulfates, alkyl amide sulfates, polyoxyethylene alkyl ether sulfates, etc. Sulfonates include, but are not limited to, alkyl sulfonates, alkyl benzene sulfonates, alkyl naphthalene sulfonates, sulfosuccinate ester salts, sulfo fatty acid ester salts, α-olefin sulfonates, alkyloyl alkyl taurine salts, sodium coconut oil fatty acid methyl taurine, etc. Carboxylate salts include, but are not limited to, fatty acid salts, N-acyl amino acid salts (N-acyl-L-glutamate, N-acyl-L-arginine ethyl-DL-pyrrolidone carboxylate, etc.), alkyl ether carboxylates, polyoxyethylene alkyl ether acetates, etc.

Cationic surfactants are not particularly limited, but examples include monoalkyltrimethylammonium salts, dialkyldimethylammonium salts, alkylpyridinium salts, N,N-dialkyloyloxyethyl-N-methyl,N-hydroxyethylammonium salts, alkylamine salts, and stearyldimethylbenzylammonium salts.

The amphoteric surfactants include, but are not limited to, alkyl betaines, fatty acid amidopropyl betaines, lauryl hydroxysulfobetaine, 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine, lecithin, hydrogenated lecithin, alkyloxyhydroxypropyl arginine hydrochloride, lauryl hydroxysultaine, lauriminodipropionic acid, sodium undecylhydroxyethyl imidazolinium betaine, sodium laurylaminodiacetate, lauryl dimethylaminoacetate betaine, N-[3-alkyloxy-2-hydroxypropyl]-L-arginine hydrochloride, alkyl hydroxysulfobetaines, alkyl dimethylamine oxides, sodium alkylaminodipropionate, dihydroxyalkylmethylglycine, sodium lauryldiaminoethylglycine, etc.

Moisturizing components other than component (A) are not particularly limited, but examples thereof include amino acids, hygroscopic alkalis and acids, and their salts. Examples of amino acids include glycine, valine, leucine, isoleucine, serine, threonine, phenylalanine, arginine, lysine, aspartic acid, glutamic acid, cystine, cysteine, methionine, tryptophan, etc. Examples of hygroscopic alkalis and acids and their salts include trimethylglycine, betaine, pyrophosphate, sodium pyrophosphate, chondroitin sulfate, potassium pyrophosphate, hyaluronic acid, sodium hyaluronate, sodium metaphosphate, potassium polyphosphate, sodium pyrrolidone carboxylate, sodium lactate, sodium chloride, calcium chloride, sodium alginate, sodium polyacrylate, etc. These may be used alone or in combination of two or more.

The content of component (D) is preferably 30% by mass or less, more preferably 10% by mass or less, even more preferably 5% by mass or less, particularly preferably 1% by mass or less, and most preferably 0.5% by mass or less, based on the total amount of the paper treatment agent.

Component (D) is optional, but it is necessary that it does not inhibit the gel-forming effect when paper is treated with the paper treatment agent, that is, the gelation that occurs when a network is formed between the aqueous base containing components (A) and (C) and component (B). An example of a component (D) that can inhibit gelation is the following component (D1).

(D1) Components undesirable for forming a gel Examples of components that tend to inhibit the effect of forming a gel include those that, when added to a paper treatment agent, cause the oily components to coalesce or separate, resulting in a non-uniform composition. Even if moisture is volatilized from a product to which such components have been added, it tends not to become a gel with the characteristic physical properties that exhibit the smooth slippery feel peculiar to gel.
Such ingredients are emulsion-type cosmetics such as cream, milk, liquid, etc., among emulsions prepared in advance before the addition of the ingredients. Here, the emulsion-type cosmetics contain at least an oily component, an aqueous component, and a surfactant that emulsifies them, and as is known in the art, the oily component and the aqueous component are emulsified with a surfactant.

Emulsion-type cosmetics are emulsions formulated as product specifications, and have a high degree of emulsion stability as a final product. They are also manufactured without the expectation of being dispersed in other compositions, so adding them to the paper treatment agent of the present invention may inhibit gelation. In other words, when component (D) is added as a raw material that is not formulated as a final product, the raw material can be adjusted so that it is mixed uniformly, and adjusted to a form that maintains uniformity and does not inhibit gelation on coated paper. However, since pre-formulated emulsion-type cosmetics are composed of a high degree of combination of multiple raw materials, it is difficult to adjust them so that they can be mixed uniformly, and it is practically impossible to control them to a form that does not inhibit gelation on coated paper. Since emulsion-type cosmetics are originally homogenized oil-based and aqueous components that are not compatible, it is known that selection of components and composition is required for stabilization. If a continuous phase of a different composition is mixed into a stable emulsion form, it becomes unstable, and in particular separation is likely to occur, which tends to inhibit the network that forms a gel with components (A) to (C).

The emulsion-type cosmetic that is component (D1) is not particularly limited, but examples thereof include skin cosmetics (basic cosmetics), makeup cosmetics, and hair care cosmetics.
Formulations of emulsion-type cosmetics include cream, milk, liquid, and gel. Cream generally refers to a state that is opaque and has no fluidity at room temperature (25° C.), milk generally refers to a state that is opaque, has a white appearance, and has fluidity at room temperature (25° C.), liquid generally refers to a state that is transparent in appearance and has fluidity at room temperature (25° C.), and gel generally refers to a state that is transparent in appearance and has no fluidity at room temperature (25° C.). In the present invention, it is particularly preferable that the cosmetic does not contain a cream cosmetic, milk cosmetic, or liquid cosmetic.

Cream-type cosmetics include, for example, cold cream, nourishing cream, vanishing cream, emollient cream, moisturizing cream, moisture cream, night cream, eye cream, hand cream, lip cream, shaving cream, body cream, hair cream, cleansing cream, baby cream, medical cream, skin cream, gel cream, and botanical cream.

Examples of emulsion-type cosmetics include nourishing milk, vanishing milk, emollient milk, moisturizing milk, moisture milk, night milk, eye milk, hand milk, shaving milk, body milk, hair milk, cleansing milk, baby milk, medical milk, skin milk, and botanical milk.

Examples of liquid cosmetics include nourishing liquid, vanishing liquid, emollient liquid, moisturizing liquid, moisturizing liquid, night liquid, eye liquid, shaving liquid, body liquid (body lotion), hair liquid (hair lotion), cleansing liquid (cleansing lotion), baby liquid, medical liquid, skin liquid (skin lotion), botanical liquid, lotion, beauty serum, cleansing oil, etc.

Examples of gel-like cosmetics include cold gel, nourishing gel, vanishing gel, emollient gel, moisturizing gel, moisture gel, night gel, eye gel, hand gel, lip gel, shaving gel, body gel, hair gel, cleansing gel, baby gel, medical gel, skin gel, botanical gel, etc.

The composition of the emulsion-type cosmetics described above refers to the composition of conventional emulsion-type cosmetics. Emulsion-type cosmetics mainly consist of aqueous components (water, glycerin, etc.), oily components (hydrocarbons, higher fatty acids/alcohols, vegetable oils and fats, ester oils, silicone oils, etc.), and surfactants (anionic, cationic, amphoteric, nonionic, silicone-based, etc.), with pigments/powders (talc, calcium carbonate, nylon, metal soap, etc.), solvents (butylene glycol, propylene glycol, polyethylene glycol, isododecane, etc.), thickeners, film-forming materials, taste components (colorants, fragrances, pearlizing agents, etc.), functional components (skin whitening components, barrier function repair components, plant extracts, etc.), and quality preserving agents (preservatives, antioxidants, pH adjusters, etc.) added as desired. Cosmetics are generally classified by their formulation, and include cream-type cosmetics, milky cosmetics, liquid cosmetics, and gel-type cosmetics mentioned above, as well as lotions, beauty serums, hair dyes, hair treatments, foundations, shampoos, facial cleansers and foams, sunscreens and tanning products, eyebrow and eyelash cosmetics, eye make-up, masks, skin care products for men, lipsticks, perfumes and colognes, nail care products, etc. Cosmetics have long been recognized as products distributed in the consumer market. Meanwhile, paper treatment agents, which impart moisturizing properties to toilet paper, tissues, and other papers, are also recognized as products in business-to-business transactions between paper treatment agent manufacturers and paper manufacturers. These may contain oily components, aqueous components, and surfactants as compositions, but it is well known that they are recognized and traded separately as products that include their uses. Furthermore, there is a clear difference between the parts of the body and the objects to which they are applied: cosmetics are applied to human skin and hair, such as for skin applications, make-up applications, and hair care applications, whereas paper treatment agents are applied to paper.

Depending on the blend and amount of the above-mentioned (D1) component (emulsion-type cosmetic), gel formation on paper may be inhibited, and the smooth, slippery feel characteristic of gel may not be obtained.

The paper treatment agent of the present invention preferably does not substantially contain the emulsion-type cosmetic agent of component (D1). By being substantially free of the emulsion-type cosmetic agent of component (D1), the treatment agent forms a unique and characteristic gel on the paper to which it is applied, and the moisture derived from the treatment agent is retained by the paper, imparting a smooth and slippery feel characteristic of gels. "Substantially free" is not particularly limited as long as the effects of the present invention are not impaired, but means, for example, less than 0.4 mass%, less than 0.3 mass%, or less than 0.2 mass% of the total paper treatment agent.

The paper treatment agent of the present invention contains components (A), (B), and (C), and thus has a low viscosity before being applied to paper, and after being applied to paper, the paper retains an appropriate amount of moisture, thereby exerting the effects of the present invention. As described above, the paper treatment agent of the present invention has a low viscosity, so that it is easy to transport and has good handling properties, and it is easy to control the amount of treatment agent attached to the treated paper, resulting in good operability. The paper treatment agent, which affects the texture of the paper, also has good uniform applicability to the paper.
The paper treating agent of the present invention preferably has a viscosity, measured at 60 rpm and 40° C. using a Brookfield viscometer, of less than 2000 mPa·s, and more preferably less than 500 mPa·s.

A preferred example of the paper treatment agent of the present invention is a paper treatment agent that contains, relative to the total amount of the paper treatment agent, 20% by mass or more and 89% by mass or less of component (A), more than 0.5% by mass and 40% by mass or less of an alkyl phosphate having an alkyl group with 10 to 22 carbon atoms as component (B), and more than 10% by mass and 39% by mass or less of component (C); or a paper treatment agent that contains, relative to the total amount of the paper treatment agent, 20% by mass or more and 89% by mass or less of component (A), more than 0.5% by mass and 40% by mass or less of a polyoxyalkylene alkyl ether phosphate ester salt having an alkyl group with 10 to 22 carbon atoms as component (B), and more than 10% by mass and 39% by mass or less of component (C).

(Method of manufacturing paper treatment agent)
The method for producing the paper treating agent of the present invention includes the steps of adding components (A) to (C).
The paper treating agent of the present invention can be produced by uniformly mixing the raw materials in a conventional manner, for example by stirring and mixing the raw materials at a temperature at which the raw materials dissolve.
The paper treatment agent of the present invention only needs to be a homogeneous mixture of components (A), (B), and (C), or, when component (D) is included, components (A), (B), (C), and (D), and may be, for example, in a molten state, a solubilized state, an emulsified state, or a dispersed state.

In the method for producing the paper treatment agent of the present invention, it is preferable that the process for adding components (A) to (C) does not include a process for adding an emulsion-type cosmetic, which is component (D1), after stirring and mixing the respective raw materials.
As described above, among the components (D), the component (D1) is an undesirable component for forming a gel. In particular, if the components (A), (B), and (C) are mixed uniformly and then the component (D1) is added to the uniform composition, the formation of a gel having specific physical properties that provide a smooth, slippery feel on coated paper is inhibited.
Here, "uniform" includes the absence of visual phase separation, for example, the absence of separation into upper and lower layers after standing.

(Paper)
The paper of the present invention is treated with the paper treatment agent described above. By treating the paper with the paper treatment agent of the present invention, the paper of the present invention exhibits the smooth slippery feel characteristic of gel.
Examples of papers include tissue paper, toilet paper, facial tissue, pocket tissue, paper handkerchiefs, paper towels, etc.
The basis weight of the paper is not particularly limited, but is preferably 1 to 50 g/ ^m2 , and more preferably 5 to 20 g/ ^m2 . The number of plies (the number of layers of base paper) is not particularly limited, but is preferably 1 to 5, and more preferably 2 to 3.

(Paper manufacturing method)
The paper of the present invention can be produced, for example, through the following steps 1 and 2.
Step 1: A step of adding (A) a polyhydric alcohol, (B) at least one selected from an alkyl phosphate salt and a polyoxyalkylene alkyl ether phosphate salt, each having an alkyl group with 6 to 28 carbon atoms, and (C) water to obtain a paper treatment agent having a water content of more than 10% by mass and less than 40% by mass. Step 2: A step of treating paper with the paper treatment agent to form a gel on the paper.

In step 1, a homogeneous composition containing components (A) to (C) is prepared. This paper treatment agent is in a liquid state.
In step 2, the paper is treated with a paper treatment agent, and during the treatment process, water evaporates from the paper treatment agent, forming a gel on the paper.
Here, gelation is not particularly limited, but includes a state in which fluidity is reduced, for example, when water is evaporated from a liquid paper treatment agent placed in a container, the viscosity increases significantly, and in particular, when the top surface does not tilt easily even when the container is tilted, and when an attempt is made to drip the agent from the container, it is extremely difficult for the agent to flow downward.

In step 2, the method of treating the paper with the paper treatment agent is not particularly limited, but examples thereof include a method of applying the agent to the paper. The method of applying the agent to the paper is not particularly limited, but examples thereof include transfer and spraying. Examples of the methods of applying the agent to the paper using these methods include flexographic printing, gravure printing, spraying, and rotor dampening. In the flexographic printing method, a flexographic printing machine, which is a type of letterpress printing machine, is used to transfer the paper treatment agent to the paper with a roller equipped with a printing plate made of rubber or synthetic resin with an engraved surface. In the gravure printing method, a gravure printing machine, which is a type of intaglio printing machine, is used to transfer the paper treatment agent to the paper with a roller equipped with a metal cylinder with a plate made on its surface. In the spray method, the paper treatment agent is sprayed in a mist form from a nozzle using compressed air. In the rotor dampening method, the paper treatment agent is sprayed in a mist form onto the paper with a disk rotating at high speed.

The amount of the paper treatment agent applied to the paper is not particularly limited, but is preferably 1 to 12 g/m ² , and more preferably 1.7 to 10 g/m ² , calculated in terms of the mass of the paper treatment agent.

(Method for improving the texture of paper)
The method for improving the texture of paper of the present invention is characterized by treating the paper with the paper treatment agent described above. Specific aspects of treating the paper with the paper treatment agent are as described above. By treating the paper with the paper treatment agent of the present invention, the smooth slippery feel expressed by the specific gel can be imparted to the paper, improving the texture.

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.
(1) Preparation of Paper Treatment Agent A paper treatment agent was prepared according to the following procedure.
The raw materials were charged in the amounts shown in Tables 1A to 1D into a beaker and mixed under stirring at a temperature at which each raw material dissolved to prepare a paper treatment agent. The amounts of each component shown in Tables 1A to 1D indicate the effective amount excluding moisture when the apparent amount contains moisture. The amount of moisture in the apparent amount is included in the amount of water added in the tables.

(2) Preparation of Coated Paper The paper treatment agent obtained by the above method was evenly applied to both sides of a dry tissue (ply number 2, basis weight 12-14 g/ ^m2 ) so that the mass of the paper treatment agent was 25% by mass ±3% of the mass of the base paper, and then it was air-dried for 3 hours.

(3) Evaluation The paper treatment agents and coated papers of the respective Examples and Comparative Examples prepared above were evaluated as follows.
[Gel-specific smooth slippery feel (sensory evaluation)]
For the sensory evaluation, the coated papers prepared by the procedure in (2) above were evaluated by 10 experienced panelists using a score of 1 to 3 based on the following evaluation points, and the smooth slippery feel characteristic of the gel was evaluated based on the average value according to the following criteria.
Rating: 3 points: A smooth, slippery feel characteristic of gel is felt.
2 points: A slightly smooth, slippery feeling characteristic of gel is felt.
1 point: The smooth slippery feeling characteristic of gel is not felt.
Evaluation criteria: ◎++: The average score of the 10 panelists is 2.7 points or more. ◎+: The average score of the 10 panelists is 2.3 points or more and less than 2.7 points. ◎: The average score of the 10 panelists is 2.0 points or more and less than 2.3 points. ○: The average score of the 10 panelists is 1.8 points or more and less than 2.0 points. △: The average score of the 10 panelists is 1.5 points or more and less than 1.8 points. ×: The average score of the 10 panelists is less than 1.5 points.

[Gel-specific smooth slippery feel (tan δ value)]
In order to simulate the treatment agent on coated paper, the moisture content in the treatment agent on the coated paper was calculated from the following formula, and a treatment agent having the calculated moisture content was prepared.
Moisture content (mass %) in the treatment agent on the coated paper = (amount of moisture derived from the treatment agent) / {(amount of moisture derived from the treatment agent) + (amount of adhesion)}.
The moisture content derived from the treatment agent was determined by measuring the moisture content of uncoated paper and coated paper according to the evaluation of [Moisture content of coated paper], and calculating the moisture content derived from the treatment agent on the coated paper using the following formula.
Amount of moisture derived from treatment agent (mass%) = (amount of moisture in coated paper) - (amount of moisture in uncoated paper)
The amount of adhesion was calculated by the following formula after measuring the amount of extractable material by Soxhlet extraction of the coated paper.
Adhesion amount (mass%)=[(mass of extract)/(mass of test paper)-(mass of extract))]×100
Using a rheometer MCR102 (manufactured by Anton Paar) as a testing device, strain dispersion measurement (temperature 25°C, frequency 1 Hz) of the sample prepared above was performed to measure the loss modulus and storage modulus at a strain of 1%, and the loss tangent was calculated by the following formula.
Loss tangent (tan δ value) = loss modulus (G') / storage modulus (G'')
The larger the tan δ value, the more viscous the material (liquid-like properties), and the smaller the tan δ value, the more elastic the material (solid-like properties). There is a correlation between the tan δ value and the smooth slippery feel that is characteristic of gels, and the smaller the tan δ value, the smoother the texture. However, when the tan δ value exceeds a certain value, the material becomes solid-like, and the applied paper becomes hard, resulting in a poor texture.
From the viewpoint of forming a gel with an appropriate hardness, the tan δ value is preferably 10,000 or less, more preferably 100 or less, even more preferably 50 or less, and even more preferably 1 or less. From the viewpoint of forming a gel with an appropriate softness, the tan δ value is preferably 0.01 or more, more preferably 0.1 or more. Also, it is preferably 0.1 or more and 10,000 or less, and more preferably 0.1 or more and 100 or less.

Tables 1A to 1D confirm that there is a correlation between tan δ and the "smooth slipperiness characteristic of gel" in the sensory evaluation.
The following evaluation was carried out regarding the difference between the above-mentioned "smooth slippery feeling characteristic of gel" and a normal "slippery feeling." For Example 5, Example 3, Comparative Example 1, and Comparative Example 2 in Table 1, the latter "slippery feeling" was evaluated according to the following criteria and compared with the former "smooth slippery feeling characteristic of gel."
[Smoothness (sensory evaluation)]
For the sensory evaluation, the coated papers prepared by the procedure in (2) above were evaluated by 10 experienced panelists on a scale of 1 to 3 based on the following evaluation criteria, and the slipperiness was evaluated based on the average score according to the following criteria.
Evaluation score: 3 points: Slippery feeling.
2 points: A slight slippery feeling is felt.
1 point: No slippery feeling.
Evaluation criteria: ⊚: The average score of the 10 panelists is 2.5 points or more. ○: The average score of the 10 panelists is 1.5 points or more and less than 2.5 points. ×: The average score of the 10 panelists is less than 1.5 points.

The results of the above evaluation are shown in Table 2. For Example 5, Example 3, Comparative Example 1, and Comparative Example 2, the results of "smooth slipperiness characteristic of gel" and tan δ in Table 1 are also shown for "smooth slipperiness". It can be seen that while no particular difference is seen in "smooth slipperiness characteristic of gel" between Example 5 and Example 3 and Comparative Examples 1 and 2, there is a notable difference in "smooth slipperiness characteristic of gel".

[Moisturizing sensation (sensory evaluation)]
For the sensory evaluation, the coated papers prepared by the procedure in (2) above were evaluated by 10 experienced panelists on a scale of 1 to 3 based on the following evaluation points, and the moist feeling was evaluated based on the average value according to the following criteria.
Rating: 3 points: Feels moist.
2 points: Feels slightly moist.
1 point: No moist feeling.
Evaluation criteria: ◎+: The average score of the 10 panelists is 2.5 points or more. ◎: The average score of the 10 panelists is 2.0 points or more and less than 2.5 points. ○: The average score of the 10 panelists is 1.5 points or more and less than 2.0 points. ×: The average score of the 10 panelists is less than 1.5 points.

[Moisture content of coated paper]
The coated paper was prepared by coating the treatment agent at 25% by weight relative to the weight of the dry tissue. The moisture content of the coated paper was measured by measuring the weight of five samples (10 sheets) at 25°C and 40% humidity for 24 hours. The samples were then weighed to a constant weight in a dryer at 80°C, and the weight of the bone-dry paper was measured and calculated using the following formula:
Moisture content (mass%)={(mass of moisture-conditioned paper)-(mass of bone-dry paper)}/(mass of bone-dry paper)×100

[Viscosity of paper treatment agent]
The viscosity of the paper treating agent prepared by the above procedure (1) was measured at 60 rpm and 40° C. using a Brookfield viscometer, and evaluated according to the following criteria.
Evaluation criteria: ◯: Viscosity of the paper treatment agent is less than 500 mPa·s; △: Viscosity of the paper treatment agent is 500 mPa·s or more and less than 2000 mPa·s; ×: Viscosity of the paper treatment agent is 2000 mPa·s or more or cannot be measured (unable to maintain a uniform state)

The formulations of the examples and comparative examples and the evaluation results of each item are shown in Tables 1A to 1D. In Tables 1A to 1D, the formulation amount of each component is shown in parts by mass.
In the evaluation of each item in Tables 1A to 1D, in the evaluation of the smooth slippery feel characteristic of the gel (sensory evaluation), ◯, ◎, ◎+, and ◎++ indicate good solutions to the problems of the invention, with the order of better. In addition, in this evaluation, if it was △ or lower, it was determined that it did not solve the problems of the invention. The overall evaluation of each evaluation is also shown in Table 1, with a scale of ◎+, ◎, ◯, △, and ×. The results regarding the difference between the above-mentioned "smooth slippery feel characteristic of the gel" and "slippery feel" are shown in Table 2.
In the table, C in (B) alkyl phosphate ester salt or polyoxyalkylene alkyl ether phosphate ester salt indicates the number of carbon atoms in the alkyl group.

Claims (7)

1. (A) a polyhydric alcohol, (B) at least one selected from an alkyl phosphate salt and a polyoxyalkylene alkyl ether phosphate salt, the alkyl group of which has 6 to 28 carbon atoms, and (C) water,
   (C) A paper treatment agent having a water content of more than 10% by mass and less than 40% by mass.
2. The paper treatment agent according to claim 1, which forms a gel on the treated paper.
3. The paper treatment agent according to claim 1 or 2, which is substantially free of emulsion-type cosmetics.
4. The paper treatment agent according to any one of claims 1 to 3, in which the content of component (B) is more than 0.5 mass%.
5. Paper treated with the paper treatment agent according to any one of claims 1 to 4.
6. A method for improving the texture of paper by treating the paper with the paper treating agent according to any one of claims 1 to 4.
7. The method for producing the paper treatment agent according to any one of claims 1 to 4, comprising the step of adding the components (A) to (C).