Softening agent for paper and paper

Abstract

The purpose of the present invention is to provide: a softening agent for paper, which imparts excellent texture and little reduction in paper strength when added to a pulp slurry; and paper containing the softening agent for paper. The softening agent for paper contains a component (A) and a component (B), the component (A) is at least one compound selected from the group consisting of (a1) a polyoxyalkylene monoalkylamine or a polyoxyalkylene monoalkenyl amine and (a2) a polyoxyalkylene monoalkylpropane diamine or a polyoxyalkylene monoalkenyl propane diamine, and the number of carbon atoms of the compound is within a specific range; the component (A) is at least one compound selected from the group consisting of (a1) a polyoxyalkylene monoalkylamine or a polyoxyalkylene monoalkenyl amine and (a2) a polyoxyalkylene monoalkylpropane diamine or a polyoxyalkylene monoalkenyl propane diamine; the component (B) is at least one compound having carbon atoms in a specific range selected from the group consisting of (b1) a polyoxyalkylene monoalkyl ether or a polyoxyalkylene monoalkenyl ether, (b2) a polyoxyalkylene monoalkyl ester or a polyoxyalkylene monoalkenyl ester, and (b3) a polyoxyalkylene monoalkyl ether monoalkenyl ester or a polyoxyalkylene monoalkenyl ether monoalkenyl ester.

Description

Technical Field

[0001] The present invention relates to a paper softener that imparts excellent texture when added to pulp slurry and causes little reduction in paper strength, and paper containing the paper softener. Background Art

[0002] In recent years, for sanitary papers such as toilet paper, tissue paper, kitchen paper, and facial tissue, properties such as good texture and difficulty in breaking have been required. Generally, a paper softener adheres to the surface of cellulose fibers to improve the texture, but at the same time, it hinders the hydrogen bonds between cellulose fibers and reduces the paper strength. Therefore, a paper softener that imparts excellent texture and causes little reduction in paper strength is required.

[0003] As conventional paper softeners, quaternary ammonium salt type softeners represented by di-long-chain alkyl type quaternary ammonium salts (for example, refer to Patent Document 1), and nonionic surfactants such as polyalkylene alkyl ethers (for example, refer to Patent Documents 2 and 3) are known.

[0004] However, the quaternary ammonium salt type softener significantly reduces the paper strength, and its usage amount is limited. In addition, when a nonionic surfactant is added to pulp slurry, it is not easily fixed to the paper, and its softening effect cannot be fully satisfied.

[0005] In view of these problems, a paper softener that improves the fixation of a nonionic surfactant by pre-mixing a quaternary ammonium salt type softener and a nonionic surfactant and adding them to pulp slurry is known (for example, Patent Document 4).

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: Japanese Patent Laid-Open No. 63-165597

[0009] Patent Document 2: Japanese Patent Publication No. 41-9801

[0010] Patent Document 3: Japanese Patent Laid-Open No. 56-107072

[0011] Patent Document 4: Japanese Patent Laid-Open No. 2004-44058 Summary of the Invention

[0012] Problems to be Solved by the Invention

[0013] The texture of the paper produced using the softener shown in Patent Document 4 is not necessarily sufficient, and the reduction in paper strength is still large.

[0014] An object of the present invention is to provide a paper softener and paper that impart excellent texture to paper and cause little reduction in paper strength when added to pulp slurry.

[0015] Method for solving problems

[0016] The inventors have found that a paper softener obtained by premixing a tertiary amine compound having a specific structure and a nonionic surfactant exhibits excellent texture and little reduction in paper strength, and thus completed the present invention.

[0017] That is, the present invention as a method for solving the above problems is as follows.

[0018] <1>A paper softener containing component (A) and component (B);

[0019] Component (A) is at least one selected from (a1) and (a2), and is a compound in which the number of carbon atoms of the oxyalkylene group is 2 or 3 and the number of carbon atoms of the alkyl or alkenyl group is 8 to 18.

[0020] (a1) Polyoxyalkylene monoalkylamine or polyoxyalkylene monoalkenylamine

[0021] (a2) Polyoxyalkylene monoalkylpropylenediamine or polyoxyalkylene monoalkenylpropylenediamine;

[0022] Component (B) is at least one selected from (b1), (b2) and (b3), and is a compound in which the number of carbon atoms of the oxyalkylene group is 2 or 3 and the number of carbon atoms of the alkyl or alkenyl group is 10 to 18.

[0023] (b1) Polyoxyalkylene monoalkyl ether or polyoxyalkylene monoalkenyl ether

[0024] (b2) Polyoxyalkylene monoalkyl ester or polyoxyalkylene monoalkenyl ester

[0025] (b3) Polyoxyalkylene monoalkyl ether monoalkenyl ester or polyoxyalkylene monoalkenyl ether monoalkenyl ester.

[0026] <2>The paper softener according to <1> above, wherein the oxyalkylene group of component (A) is an ethyleneoxy group.

[0027] <3>The paper softener according to <1> above, wherein component (B) is at least one selected from (b1) and (b2).

[0028] <4>The paper softener according to <3> above, wherein component (B) is (b1) and contains an ethyleneoxy group and a propyleneoxy group as the oxyalkylene group.

[0029] <5>The paper softener according to <1> above, wherein the mass ratio of component (A) to component (B) is (A) / (B) = 80 / 20 to 20 / 80.

[0030] <6>A paper, characterized in that it contains 0.01 to 3% by mass of the paper softener described in any one of <1> to <5> above.

[0031] Advantages of the Invention

[0032] According to the present invention, it is possible to provide a paper softener that imparts excellent texture to paper and causes little reduction in paper strength. Detailed Embodiments

[0033] The present invention relates to a paper softener, characterized in that it contains the following component (A) and component (B). Component (A) and component (B) may each be used alone or two or more thereof may be mixed.

[0034] Component (A) in the present invention is at least one selected from (a1) and (a2), and is a compound in which the number of carbon atoms of the oxyalkylene group is 2 or 3 and the number of carbon atoms of the alkyl or alkenyl group is 8 to 18.

[0035] (a1) Polyoxyalkylene monoalkylamine or polyoxyalkylene monoalkenylamine,

[0036] (a2) Polyoxyalkylene monoalkylpropylenediamine or polyoxyalkylene monoalkenylpropylenediamine.

[0037] The compound (a1) used in the present invention has a tertiary amine structure in which two or more oxyalkylene groups are added to a primary amine containing an alkyl or alkenyl group having 8 to 18 carbon atoms. Compounds in which a specified number of oxyalkylene groups are added to 1 mole of diamine are commercially available and easily obtainable.

[0038] The oxyalkylene group of the compound (a1) is an oxyalkylene group having 2 carbon atoms (hereinafter, referred to as an ethyleneoxy group) or an oxyalkylene group having 3 carbon atoms (hereinafter, referred to as a propyleneoxy group), and they may be contained alone or in combination of two. In the case of containing two, the addition mode of the ethyleneoxy group and / or propyleneoxy group may be random or block. From the viewpoint of improving texture, the total number of added oxyalkylene groups is preferably 2 to 20, more preferably 2 to 10. In addition, the ethyleneoxy group is preferred.

[0039] From the viewpoints of dispersibility in water and imparting texture to paper, the number of carbon atoms of the alkyl and / or alkenyl group of the compound (a1) is 8 to 18. Examples of the primary amine having an alkyl and / or alkenyl group having 8 to 18 carbon atoms include octylamine (octane-1-amine), decylamine (decane-1-amine), laurylamine (dodecane-1-amine), myristylamine (tetradecane-1-amine), cetylamine (hexadecane-1-amine), stearylamine (octadecane-1-amine), oleylamine ((Z)-9-octadecen-1-amine), etc., and they may be used alone or in combination of two or more.

[0040] As commercially available products of the compound (a1), for example, "polyoxyethylene laurylamine, polyoxyethylene tallow alkylamine, polyoxyethylene stearylamine" manufactured by Aoki Yushi Kogyo Co., Ltd., "polyoxyethylene laurylamine, polyoxyethylene stearylamine" manufactured by Kao Corporation, "polyoxyethylene coconut alkylamine, polyoxyethylene laurylamine, polyoxyethylene tallow alkylamine, polyoxyethylene stearylamine" manufactured by Nippon Yushi Co., Ltd., "polyoxyethylene coconut alkylamine, polyoxyethylene polyoxypropylene coconut alkylamine, polyoxyethylene oleylamine" manufactured by Lion Corporation, and "aliphatic amine-based polyol" manufactured by Sanyo Chemical Industries, Ltd. can be cited.

[0041] The compound (a2) used in the present invention has a structure having two tertiary amines with three or more oxyalkylene groups added to propylenediamine having an alkyl or alkenyl group having 8 to 18 carbon atoms. Compounds having a specified number of oxyalkylene groups added to 1 mole of diamine are commercially available and easily obtainable.

[0042] The oxyalkylene group of the compound (a2) is an ethyleneoxy group or a propyleneoxy group, and they may be contained alone or in combination of two. In the case of containing two, the addition mode of the ethyleneoxy group and / or propyleneoxy group may be random or block. From the viewpoint of improving the texture, the total addition amount of each oxyalkylene group is preferably 3 to 20, more preferably 3 to 10. In addition, an ethyleneoxy group is preferred.

[0043] From the viewpoints of dispersibility in water and imparting texture to paper, the alkyl and / or alkenyl group of the compound (a2) has 14 to 18 carbon atoms. Examples of propylenediamine having an alkyl and / or alkenyl group having 14 to 18 carbon atoms include N-alkyl (C14 - C18)-propylenediamine, N-tall oil-propylenediamine, N-stearyl-propylenediamine, etc., and they may be used alone or in combination of two or more.

[0044] As commercially available products of the compound (a2), for example, "polyoxyethylene tallow propylenediamine, polyoxyethylene stearyl propylenediamine" manufactured by Aoki Yushi Kogyo Co., Ltd., "polyoxyethylene alkyl propylenediamine" manufactured by Nippon Yushi Co., Ltd., and "polyoxyethylene tallow alkyl propylenediamine" manufactured by Lion Corporation can be cited.

[0045] The component (B) in the present invention is at least one selected from (b1), (b2), and (b3), and is a compound having 2 or 3 carbon atoms in the oxyalkylene group and 10 to 18 carbon atoms in the alkyl or alkenyl group.

[0046] (b1) Polyoxyalkylene monoalkyl ether or polyoxyalkylene monoalkenyl ether,

[0047] (b2) Polyoxyalkylene monoalkyl ester or polyoxyalkylene monoalkenyl ester,

[0048] (b3) Polyoxyalkylene monoalkyl ether monoalkenyl ester or polyoxyalkylene monoalkenyl ether monoalkenyl ester.

[0049] The compound (b1) used in the present invention has a structure in which an oxyalkylene group is added to an alcohol having 10 to 18 carbon atoms. Compounds in which a specified amount of oxyalkylene groups are added to 1 mole of alcohol are commercially available and easily obtainable.

[0050] The oxyalkylene group of the compound (b1) is an ethyleneoxy group or a propyleneoxy group. They may be contained alone or in combination of two, and preferably both an ethyleneoxy group and a propyleneoxy group are contained. The addition mode of the ethyleneoxy group and / or propyleneoxy group may be random or block.

[0051] The alcohol having 10 to 18 carbon atoms may be any of a straight-chain alcohol, a branched-chain alcohol, a saturated alcohol, and an unsaturated alcohol. Among these various alcohols, decanol (decan-1-ol), lauryl alcohol (dodecan-1-ol), tridecanol (tridecan-1-ol), myristyl alcohol (tetradecan-1-ol), cetyl alcohol (hexadecan-1-ol), stearyl alcohol (octadecan-1-ol), and oleyl alcohol ((Z)-9-octadecen-1-ol) are preferred. They may be used alone or in combination of two or more.

[0052] As commercially available products of the compound (b1), there can be mentioned "FINESURF (registered trademark)" series, "BLAUNON (registered trademark)" series, "WONDERSURF (registered trademark)" series manufactured by Aoki Yushi Industry Co., Ltd., "EMULGEN (registered trademark)" series manufactured by Kao Corporation, "NONION" series, "UNILUBE (registered trademark)" series manufactured by Nippon Oil & Fats Co., Ltd., "PELETEX (registered trademark)" series manufactured by Miyoshi Oil & Fat Co., Ltd., "LEOX (registered trademark)" series, "LEOCOL (registered trademark)" series, "LIONOL (registered trademark)" series manufactured by Lion Corporation.

[0053] The compound (b2) used in the present invention has a structure in which an oxyalkylene group is added to a fatty acid having 10 to 18 carbon atoms. Compounds in which a specified amount of oxyalkylene groups are added to 1 mole of fatty acid are commercially available and easily obtainable.

[0054] The oxyalkylene group of the compound (b2) is an ethyleneoxy group or a propyleneoxy group. They may be contained alone or in combination of two, and preferably both an ethyleneoxy group and a propyleneoxy group are contained. The addition mode of the ethyleneoxy group and / or propyleneoxy group may be random or block.

[0055] The fatty acid having 10 to 18 carbon atoms may be any one of a straight-chain fatty acid, a branched-chain fatty acid, a saturated fatty acid, and an unsaturated fatty acid. Among these various fatty acids, lauric acid (dodecanoic acid), stearic acid (octadecanoic acid), and oleic acid (octadecenoic acid) are preferred. They may be used alone or in combination of two or more.

[0056] Examples of commercially available products of the compound (b2) include "FINESURF (registered trademark)" series manufactured by Aoki Oil & Fat Industry Co., Ltd., "BLAUNON (registered trademark)" series, "EMANON" series manufactured by Kao Corporation, "NONION" series, "UNILUBE (registered trademark)" series manufactured by Nippon Oil Corporation, "PELETEX (registered trademark)" series manufactured by Miyoshi Oil & Fat Co., Ltd., and "LEOFAT (registered trademark)" series manufactured by Lion Corporation.

[0057] The compound (b3) used in the present invention is a compound obtained by adding a specified number of epoxyalkyl groups to an alcohol compound having an alkyl and / or alkenyl group with 10 to 18 carbon atoms and then reacting a fatty acid having 10 to 18 carbon atoms. It is commercially available and easily obtainable.

[0058] The oxyalkylene group of the compound (b3) is an epoxyethyl group or an epoxypropyl group. They may be contained alone or in combination of two, and preferably both an epoxyethyl group and an epoxypropyl group are contained. The addition mode of the epoxyethyl group and / or epoxypropyl group may be random or block.

[0059] The alcohol having 10 to 18 carbon atoms may be any one of a straight-chain alcohol, a branched-chain alcohol, a saturated alcohol, and an unsaturated alcohol. Among them, myristyl alcohol (tetradecan-1-ol) and oleyl alcohol ((Z)-9-octadecen-1-ol) are preferred. They may be used alone or in combination of two or more.

[0060] The fatty acid having 10 to 18 carbon atoms may be any one of a straight-chain fatty acid, a branched-chain fatty acid, a saturated fatty acid, and an unsaturated fatty acid, and preferably oleic acid (octadecenoic acid).

[0061] As the component (B) in the present invention, considering the texture of the obtained paper, it is preferably at least contained the compound (b1) and / or the compound (b2).

[0062] The mass ratio (%) of the component A to the component B in the present invention is preferably A / B = 80 / 20 to 20 / 80, and more preferably A / B = 60 / 40 to 40 / 60. When the proportion of the component A is 80 or less, the texture of the paper is good and the decrease in paper strength is small. When it is 20 or more, sufficient softness can be obtained while the texture is good.

[0063] The softener for paper of the present invention contains the above-mentioned component (A) and the above-mentioned component (B) without solvent or in a solvent. Examples of the solvent include water, alcohols such as isopropyl alcohol, etc.

[0064] When water is used as the solvent of the softener for paper of the present invention, in order to improve the storage stability, a pH regulator can be used to adjust the pH. Examples of the pH regulator include inorganic acids such as hydrochloric acid and sulfuric acid, organic acids such as citric acid and acetic acid; inorganic bases such as sodium hydroxide, potassium hydroxide, sodium carbonate, and potassium carbonate; monoamine compounds such as ammonia.

[0065] The softener for paper of the present invention can obtain a more preferable softener for paper by mixing component (A) and component (B) in the above-mentioned ratio. By adding this softener for paper to paper stock (pulp slurry) for use, the texture and softness of the paper can be improved. If component (A) and component (B) are added to the paper stock separately, the object of the present invention cannot be achieved. It is considered that the above-mentioned softener for paper of the present invention forms micelles composed of component (A) and component (B) because the hydrophobic parts in component (A) and the hydrophobic parts in component (B) are slowly combined by van der Waals forces, so the technical effects of the present invention that cannot be obtained when component (A) and component (B) are added separately can be achieved.

[0066] In the present invention, the softener for paper used is usually added in a proportion such that the total of component (A) and component (B) is 0.01 to 3% by mass, preferably 0.02 to 1.5% by mass, based on the absolute dry weight of the pulp. When it is less than 0.02% by mass, it may not be possible to obtain a sufficient effect of improving the texture, and when it is more than 1.5% by mass, the decrease in paper strength may become larger.

[0067] In this way, by adding the obtained softener for paper of the present invention to the paper stock, excellent texture can be imparted to the paper, and paper with a small decrease in paper strength can be obtained.

[0068] The paper containing the softener for paper of the present invention is not particularly limited, and various papers and paperboards can be cited. Examples of the types of paper include recording papers such as PPC paper, inkjet printing paper, laser printer paper, foam paper, thermal transfer paper, thermal recording base paper, and pressure-sensitive recording base paper, photographic paper and its base paper, art paper, cast-coated paper, coated base paper such as high-quality coated paper, packaging papers such as kraft paper and pure white reel paper, hygienic papers such as tissue paper, toilet paper, facial tissue paper, and kitchen paper, other notebook papers, book papers, various printing papers, newspaper papers, etc. (Western papers), manila board, white board, chip board, etc. for paper containers, linerboard, and gypsum board base paper, etc. Among them, hygienic paper is particularly preferred.

[0069] The paper containing the paper softener of the present invention may contain bleached or unbleached chemical pulps such as kraft pulp or sulfite pulp, bleached or unbleached high-yield pulps such as groundwood pulp, mechanical pulp or thermomechanical pulp, waste paper pulps such as newspaper waste paper, magazine waste paper, corrugated waste paper or deinked waste paper as pulp raw materials. In addition, a mixture of the above pulp raw materials and synthetic fibers such as polyamide, polyimide, polyester, polyolefin and polyvinyl alcohol may also be contained.

[0070] When manufacturing the paper of the present invention, additives such as fillers, sizing agents, dry paper strength enhancers, wet paper strength enhancers, retention aids, bulking agents, paper thickness increasing agents, opacifying agents and filtering aids may also be used as needed to exhibit the physical properties required for each paper type. They can be used alone or in combination of two or more. In addition, they can be premixed with the paper softener of the present invention and then added to the paper stock for use, and the mixing method is not particularly limited.

[0071] Examples of the filler include clay, talc and calcium carbonate, etc. They can be used alone or in combination of two or more.

[0072] Examples of the sizing agent include fatty acid soap sizing agents such as sodium stearate, rosin, reinforced rosin and rosin ester sizing agents, aqueous emulsions of alkenyl succinic anhydride, aqueous emulsions of 2-oxetanone, aqueous emulsions of paraffin, cationic sizing agents obtained by the reaction of carboxylic acids and polyamines, and aqueous emulsions of reactants of aliphatic oxyacids and aliphatic amines or aliphatic alcohols, cationic styrene sizing agents, etc. They can be used alone or in combination of two or more.

[0073] Examples of the dry paper strength enhancer include anionic polyacrylamide, cationic polyacrylamide, amphoteric polyacrylamide, cationized starch and amphoteric starch, etc. They can be used alone or in combination of two or more.

[0074] Examples of the wet paper strength enhancer include polyamide-epichlorohydrin resin, melamine formaldehyde resin and urea-formaldehyde resin, etc. They can be used alone or in combination of two or more. In addition, the wet paper strength enhancer can be added before, after or simultaneously with the addition of the paper softener of the present invention.

[0075] Examples of the retention aid include anionic, cationic or amphoteric high molecular weight polyacrylamide, the combination of silica sol and cationized starch, and the combination of bentonite and cationic high molecular weight polyacrylamide, etc. They can be used alone or in combination of two or more.

[0076] Examples of the filtering aid include polyethyleneimine or cationic, amphoteric or anionic polyacrylamide, etc. They can be used alone or in combination of two or more.

[0077] In addition, sizing presses, horizontal roll coaters, Billblade coaters, calenders, etc. can be used as needed to apply surface paper strength enhancers such as starch, polyvinyl alcohol, and acrylamide-based polymers, dyes, coatings, surface sizing agents, anti-slip agents, and polyol-based humectants. They can be used alone or in combination of two or more.

[0078] Examples

[0079] Hereinafter, examples and comparative examples will be listed to specifically illustrate the present invention, but the present invention is not limited to these examples. It should be noted that in each example, % is by mass unless otherwise specified.

[0080] (Example 1)

[0081] Bleached kraft pulp (hardwood / softwood = 7 / 3) was beaten with a Niagara Beater to prepare a pulp slurry with a Canadian Standard Freeness (CSF) of 550 and a concentration of 2.4%. While stirring the pulp slurry, a 1% dilution of the paper softener described in Example 1 of Table 1 was added at a total of 0.3% of components (A) and (B) relative to the absolute dry weight of the pulp. After stirring for 1 minute, sheet forming was carried out using a square sheet former to obtain a hand sheet with a basis weight of 40 g / m 2 The obtained hand sheet was conditioned at 23°C and 50% humidity for 24 hours.

[0082] <Evaluation of paper>

[0083] (Evaluation of texture)

[0084] Two obtained conditioned hand sheets were overlapped with both sides as the surface, and a sensory evaluation of the texture was carried out by holding them by hand.

[0085] Ten people were used for the evaluation. Papers that were felt to have a good touch by 8 or more out of 10 people were evaluated as ◎, papers that were felt to have a good touch by 5 or more and less than 8 out of 10 people were evaluated as ○, papers that were felt to have a poor touch by 5 or more out of 10 people were evaluated as ×, and others were evaluated as △. The texture was evaluated in 4 grades. The results are shown in Table 1.

[0086] Evaluation: Excellent texture ◎←○←△←× Poor texture.

[0087] (Evaluation of dry strength and softness)

[0088] For the obtained conditioned hand sheet, as an index of dry tensile strength and softness, the Young's modulus was measured by the following method. The results are shown in Table 1.

[0089] Dry tensile strength: According to JIS P8113

[0090] Young's modulus: The ultrasonic wave propagation velocity V is measured by the orientation measuring instrument SST-2500 manufactured by Nomura Shoji Co., Ltd., and the Young's modulus is calculated from the following formula. The lower the value, the softer the paper becomes.

[0091] Young's modulus ∝ ρV2 (ρ: density)

[0092] <Evaluation of paper softener>

[0093] (Evaluation of dilution dispersibility)

[0094] Add 30 ml of water to a 50-ml beaker, stir at a rotation speed of 300 rpm (rotor 30 mm × 7 mm), and keep the temperature of the liquid being used at 25 °C. Stir under this condition, and at the same time add 0.3 ml of the paper softener described in Example 1, and measure the time until it becomes visually uniform.

[0095] The shorter the time, the more excellent the dispersibility. The results are shown in Table 1.

[0096] ◎: Dispersed in less than 30 seconds

[0097] : Dispersed in 30 seconds or more and less than 60 seconds

[0098] △: Dispersed in 60 seconds or more and less than 120 seconds

[0099] ×: Requiring more than 120 seconds

[0100] (Evaluation of static stability)

[0101] Investigate the stability of the paper softener described in Example 1 of Table 1 when left standing at 25 °C for 1 month. In the evaluation, when the paper softener shows no multi-layer separation visually after standing at 25 °C for 1 month, it is evaluated as ○, and when multi-layer separation is considered to occur, it is evaluated as ×. The results are shown in Table 1.

[0102] (Examples 2 to 10), (Comparative Examples 1 to 7)

[0103] Except that the paper softener used in Example 1 was changed to the paper softeners of Examples 2 to 10 and Comparative Examples 2 to 7 in Table 1, the same operations as in Example 1 were performed to obtain a hand sheet with a basis weight of 40 g / m 2 In Comparative Example 1, except that no paper softener was used, the same operations as in Example 1 above were performed to obtain a hand sheet with a basis weight of 40 g / m 2The handmade paper obtained was conditioned at 23°C and 50% humidity for 24 hours. The texture, dry tensile strength, and Young's modulus of the conditioned handmade paper were measured by the same method as in Example 1 above. In addition, the dispersibility and static stability of the paper softeners in Examples 2 to 10 and Comparative Examples 2 to 7 in Table 1 were evaluated by the same method as the method described in Example 1 above. However, for the paper softener in Comparative Example 7, a commercially available 28% aqueous solution was diluted to the same concentration as the method described in Example 1 for measurement. The measurement results are shown in Table 1.

[0104] [Table 1]

[0105]

[0106] <Explanation of the statements in the table>

[0107] Aliphatic amine-based polyol: "SANNIX (registered trademark) AP-470" manufactured by Sanyo Chemical Industries, Ltd.

[0108] Polyoxypropylene polyoxyethylene coconut alkylamine (8EO)(8PO): "LIPONOL (registered trademark) C / 18-18" manufactured by Lion Specialty Chemicals Co., Ltd.

[0109] Polyoxyethylene stearylamine: "NYMEEN (registered trademark) S-204" manufactured by NOF Corporation

[0110] N,N′,N′-Polyoxyethylene-N-alkyl(tallow)-1,3-diaminopropane (15EO): "LIPONOL (registered trademark) DA-T / 25" manufactured by Lion Specialty Chemical Co., Ltd.

[0111] Polyoxyethylene laurylamine: "BLAUNON (registered trademark) L-202" manufactured by Aoki Yushi Kogyo Co., Ltd.

[0112] N,N-bis(2-hydroxyethyl)oleylamine: "LIPONOL (registered trademark) O / 12" manufactured by Lion Specialty Chemical Co., Ltd.

[0113] Polyoxyethylene alkyl propylenediamine: "NYMEEN (registered trademark) DT-208" manufactured by NOF Corporation

[0114] Polyoxyethylene oleylamine (5EO): "LIPONOL (registered trademark) O / 15" manufactured by Lion Specialty Chemical Co., Ltd.

[0115] N,N′,N′-Tris(2-hydroxyethyl)-N-alkyl(tallow)1,3-diaminopropane: "LIPONOL (registered trademark) DA-T / 13" manufactured by Lion Specialty Chemical Co., Ltd.

[0116] Stearylamine: "FARMIN (registered trademark) 80S" manufactured by Kao Corporation

[0117] Laurylamine: "FARMIN (registered trademark) 20D" manufactured by Kao Corporation

[0118] Oleylamine: "LIPOMIN (registered trademark) OD" manufactured by Lion Specialty Chemicals Co., Ltd.

[0119] Stearyl trimethyl ammonium chloride: "QUARTAMIN86W" (28% aqueous solution) manufactured by Kao Corporation

[0120] POEPOPMSEO: Abbreviation for oleic acid ester of polyoxyethylene polyoxypropylene myristyl ether

[0121] POEPOPOEO: Abbreviation for oleic acid ester of polyoxyethylene polyoxypropylene oleyl ether

[0122] Polyoxyethylene decyl ether: "FINESURF (registered trademark) D - 1303" manufactured by Aoki Yushi Kogyo Co., Ltd.

[0123] Polyoxypropylene stearyl ether: "UNILUBE (registered trademark) MS - 70K" manufactured by Nippon Oil & Fats Co., Ltd.

[0124] Polyoxyethylene oleyl ester: "BLAUNON (registered trademark) O - 200SA" manufactured by Aoki Yushi Kogyo Co., Ltd.

[0125] Polyoxyethylene polyoxypropylene tridecyl ether: "WONDERSURF (registered trademark) S - 1000" manufactured by Aoki Yushi Kogyo Co., Ltd.

[0126] Polyoxyethylene polyoxypropylene stearyl ether: "BLAUNON (registered trademark) SA - 30 / 702000R" manufactured by Aoki Yushi Kogyo Co., Ltd.

[0127] (Example 11)

[0128] The bleached kraft pulp (hardwood / softwood = 7 / 3) was beaten with a Niagara beater to prepare a pulp slurry with a Canadian Standard Freeness (CSF) of 550 and a concentration of 2.4%. While stirring the pulp slurry, 0.05% of polyamide-epichlorohydrin resin (WS4020: manufactured by Starlight PMC) was added. Then, a 1% dilution of the paper softener described in Example 11 of Table 2 was added in such a way that the total of components (A) and (B) was 0.3% based on the absolute dry weight of the pulp. After stirring for 1 minute, sheet forming was carried out using a square sheet former to obtain a hand sheet with a basis weight of 40 g / m2. The obtained hand sheet was conditioned at 23°C and 50% humidity for 24 hours. The texture, dry tensile strength, and Young's modulus of the conditioned hand sheet were evaluated by the same method as in Example 1 above. In addition, the dispersibility and static stability of the paper softener described in Example 11 of Table 2 were evaluated by the same method as in Example 1 above. The measurement results are shown in Table 2.

[0129] (Examples 12 - 17), (Comparative Examples 8 - 10))

[0130] Except that the paper softener used in Example 11 was changed to the paper softeners of Examples 12 - 17 and Comparative Examples 9 and 10 in Table 2, the same operations as in Example 11 were carried out to obtain a hand sheet with a basis weight of 40 g / m 2 In Comparative Example 8, except that no paper softener was used, the same operations as in Example 1 above were carried out to obtain a hand sheet with a basis weight of 40 g / m 2 The obtained hand sheet was conditioned at 23°C and 50% humidity for 24 hours. The texture, dry tensile strength, and Young's modulus of the conditioned hand sheet were evaluated by the same method as in Example 1 above. In addition, the dispersibility and static stability of the paper softeners of Examples 12 - 17 and Comparative Examples 9 and 10 in Table 2 were evaluated by the same method as in Example 1 above. The measurement results are shown in Table 2.

[0131] [Table 2]

[0132]

[0133] <Explanation of the statements in the table>

[0134] Polyoxypropylene polyoxyethylene coconut alkylamine (8EO)(8PO): "LIPONOL (registered trademark) C / 18 - 18" manufactured by Lion Specialty Chemical Co., Ltd.

[0135] Polyoxyethylene stearylamine: "NYMEEN (registered trademark) S - 204" manufactured by NOF Corporation

[0136] N,N-Bis(2-hydroxyethyl)oleylamine (EO2): "LIPONOL (registered trademark) O / 12" manufactured by Lion Specialty Chemical Co., Ltd.

[0137] Polyoxyethylene oleylamine (5EO): "LIPONOL (registered trademark) O / 15" manufactured by Lion Specialty Chemical Co., Ltd.

[0138] N,N′,N′-Tris(2-hydroxyethyl)-N-alkyl(tallow) 1,3-diaminopropane: "LIPONOL (registered trademark) DA-T / 13" manufactured by Lion Specialty Chemical Co., Ltd.

[0139] POEPOPMSEO: Abbreviation for oleic acid ester of polyoxyethylene polyoxypropylene myristyl ether

[0140] POEPOPOEO: Abbreviation for oleic acid ester of polyoxyethylene polyoxypropylene oleyl ether

[0141] Polyoxypropylene stearyl ether: "UNILUBE (registered trademark) MS-70K" manufactured by NOF Corporation

[0142] Polyoxyethylene polyoxypropylene tridecyl ether: "WONDERSURF (registered trademark) S-1000" manufactured by Aoki Oil & Fat Industry Co., Ltd.

[0143] As shown in Table 1 and Table 2, the internal addition paper of the paper softener of Examples 1 to 17 containing the composition satisfying the present invention can obtain paper with excellent softness and texture compared to Comparative Examples 2 to 10 lacking any one of the specific A component and B component in the present invention.

Claims

1. A paper softener comprising component (A) and component (B); The component (A) is at least one selected from (a1) and (a2), and is a compound having 2 or 3 carbon atoms in the oxyalkylene group and 8 to 18 carbon atoms in the alkyl or alkenyl group. (a1) a polyoxyalkylene monoalkylamine or a polyoxyalkylene monoalkenylamine, (a2) polyoxyalkylene monoalkylpropylenediamine or polyoxyalkylene monoalkenylpropylenediamine; The component (B) is at least one selected from (b1), (b2) and (b3), and is a compound having 2 or 3 carbon atoms in the oxyalkylene group and 10 to 18 carbon atoms in the alkyl or alkenyl group. (b1) polyoxyalkylene monoalkyl ether or polyoxyalkylene monoalkenyl ether, (b2) a polyoxyalkylene monoalkyl ester or a polyoxyalkylene monoalkenyl ester, (b3) Polyoxyalkylene monoalkyl ether monoalkenyl ester or polyoxyalkylene monoalkenyl ether monoalkenyl ester.

2. The paper softener according to claim 1, characterized in that: The oxyalkylene group of the component (A) is an ethylene oxide group.

3. The paper softener according to claim 1, characterized in that: The component (B) is at least one selected from (b1) and (b2).

4. The paper softener according to claim 3, characterized in that: The component (B) is (b1) and contains an ethylene oxide group and a propylene oxide group as oxyalkylene groups.

5. The paper softener according to claim 1, characterized in that: The mass ratio of the component (A) to the component (B) is (A) / (B)=80 / 20 to 20 / 80.

6. A paper, characterized in that: The paper softening agent according to any one of claims 1 to 5 is contained in an amount of 0.01 to 3% by mass.

Images