Paper softener and paper

Abstract

To provide a paper softener imparting an excellent touch to paper while causing slight paper strength reduction when added to pulp slurry, and paper containing the paper softener.SOLUTION: The paper softener includes: a compound having a carbon number in a specified range, i.e., at least one species selected from (a1) polyoxyalkylene monoalkyl (or alkenyl) amine and (a2) polyoxyalkylene monoalkyl (or alkenyl) propylenediamine, as a component (A); and a compound having a carbon number in a specified range, i.e., at least one species selected from (b1) polyoxyalkylene monoalkyl (or alkenyl) ether, (b2) polyoxyalkylene monoalkyl (or alkenyl) ester and (b3) polyoxyalkylene monoalkyl (or alkenyl) ether monoalkenyl ester, as a component (B).SELECTED DRAWING: None

Description

Technical Field

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

Background Art

[0002] In recent years, sanitary papers such as toilet paper, tissue paper, kitchen paper, and towel paper have been required to have characteristics such as good texture and resistance to tearing. Generally, paper softeners fix on the surface of cellulose fibers to improve the texture, but at the same time inhibit hydrogen bonds between cellulose fibers and reduce paper strength. Therefore, there is a demand for a paper softener that imparts excellent texture and causes little reduction in paper strength.

[0003] Conventional paper softeners include quaternary ammonium salt type softeners typified by di-long-chain alkyl type quaternary ammonium salts (see, for example, Patent Document 1), and nonionic surfactants such as polyalkylene alkyl ethers (see, for example, Patent Documents 2 and 3).

[0004] However, the quaternary ammonium salt type softener causes a large reduction in paper strength and has a limitation on its usage amount. In addition, when a nonionic surfactant is added to a pulp slurry, its fixing to paper is poor, and its softening effect has not been sufficiently satisfactory.

[0005] In response to these problems, a paper softener (for example, Patent Document 4) that improves the fixing of a nonionic surfactant by premixing a quaternary ammonium salt type softener and a nonionic surfactant and adding the mixture to a pulp slurry is known.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

[0007] Even the paper produced using the softener disclosed in Patent Document 4 did not always have sufficient texture, and the reduction in paper strength was still significant.

[0008] An object of the present invention is to provide a paper softener and paper that, when added to a pulp slurry, impart excellent texture to the paper and cause little reduction in paper strength. [Means for Solving the Problems]

[0009] The inventors of the present invention 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 causes little reduction in paper strength, leading to the completion of the present invention.

[0010] That is, the present invention, which is the means for solving the above problems, is (A) As a component, (a1) Polyoxyalkylene monoalkylamine or polyoxyalkylene monoalkenylamine (a2) Polyoxyalkylene monoalkylpropylenediamine or polyoxyalkylene monoalkenylpropylenediamine At least one selected from the group consisting of compounds in which the oxyalkylene group has 2 or 3 carbon atoms and the alkyl or alkenyl group has 8 to 18 carbon atoms and (B) As a component, (b1) Polyoxyalkylene monoalkyl ether or polyoxyalkylene monoalkenyl ether (b2) Polyoxyalkylene monoalkyl ester, or polyoxyalkylene monoalkenyl ester (b3) Polyoxyalkylene monoalkyl ether monoalkenyl ester, or polyoxyalkylene monoalkenyl ether monoalkenyl ester, At least one selected from the group consisting of compounds in which the oxyalkylene group has 2 or 3 carbon atoms and the alkyl or alkenyl group has 10 to 18 carbon atoms A paper softener containing <2> The paper softener according to <1>, wherein the oxyalkylene group of the component (A) is an ethylene oxide group <3> The paper softener according to <1>, wherein the component (B) is at least one selected from (b1) and (b2) <4> The component (B) is (b1), and the oxyalkylene group contains an ethylene oxide group and a propylene oxide group The paper softener according to <3> <5> The paper softener according to <1>, wherein the mass ratio of the component (A) to the component (B) is (A) / (B)=80 / 20 to 20 / 80 <6> A paper characterized by containing 0.01 to 3% by mass of the paper softener according to any one of <1> to <5> is.

Advantages of the Invention

[0011] 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.

Embodiments for Carrying Out the Invention

[0012] The present invention is a paper softener characterized by containing the following components (A) and (B). As the components (A) and (B), only one type may be used, or two or more types may be mixed.

[0013] Component (A) in the present invention is (a1) Polyoxyalkylene monoalkylamine, or polyoxyalkylene monoalkenylamine (a2) Polyoxyalkylene monoalkylpropylenediamine, or polyoxyalkylene monoalkenylpropylenediamine At least one selected from the group consisting of compounds in which the oxyalkylene group has 2 or 3 carbon atoms and the alkyl or alkenyl group has 8 to 18 carbon atoms.

[0014] 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 having an alkyl or alkenyl group having 8 to 18 carbon atoms. Compounds in which a predetermined number of oxyalkylene groups are added per mole of amine are commercially available and are easily available.

[0015] The oxyalkylene group of compound (a1) is a oxyalkylene group having 2 carbon atoms (hereinafter referred to as an ethylene oxide group) or a oxyalkylene group having 3 carbon atoms (hereinafter referred to as a propylene oxide group). These may be contained alone or in combination of two. When two kinds are contained, the addition form of the ethylene oxide group and / or the propylene oxide group may be random or block. From the viewpoint of improving the texture, the total number of added oxyalkylene groups is preferably 2 to 20, more preferably 2 to 10. Also, an ethylene oxide group is preferred.

[0016] The number of carbon atoms in the alkyl group and / or alkenyl group of compound (a1) is 8 to 18 from the viewpoints of dispersibility in water and imparting texture to paper. Examples of the primary amine having an alkyl group and / or alkenyl group with 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-octadecene-1-amine), etc. These may be used alone or in combination of two or more.

[0017] Examples of commercially available products of compound (a1) include "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 polyol" manufactured by Sanyo Chemical Industries, Ltd.

[0018] Compound (a2) used in the present invention has a structure having two tertiary amines in which three or more oxyalkylene groups are added to propylenediamine having an alkyl or alkenyl group with 8 to 18 carbon atoms. Compounds in which a predetermined number of oxyalkylene groups are added per 1 mol of diamine are commercially available and are easily obtainable.

[0019] The oxyalkylene group of the compound (a2) is an ethylene oxide group or a propylene oxide group, and these may be contained alone or in combination of two kinds. When two kinds are contained, the addition form of the ethylene oxide group and / or the propylene oxide group may be random or block. From the viewpoint of improving the texture, the total number of added oxyalkylene groups is preferably 3 to 20, more preferably 3 to 10. Also, it is preferably an ethylene oxide group.

[0020] From the viewpoints of dispersibility in water and imparting texture to paper, the number of carbon atoms of the alkyl group and / or alkenyl group of the compound (a2) is 14 to 18. Examples of the propylenediamine having an alkyl group and / or alkenyl group with 14 to 18 carbon atoms include N-alkyl (C14-C18)-propylenediamine, N-tallow-propylenediamine, N-stearyl-propylenediamine, etc., and these may be used alone or in combination of two or more.

[0021] Examples of commercially available products of the compound (a2) include "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.

[0022] Component (B) in the present invention is (b1) polyoxyalkylene monoalkyl ether, or polyoxyalkylene monoalkenyl ether (b2) polyoxyalkylene monoalkyl ester, or polyoxyalkylene monoalkenyl ester (b3) polyoxyalkylene monoalkyl ether monoalkenyl ester, or polyoxyalkylene monoalkenyl ether monoalkenyl ester It is at least one selected from the group consisting of compounds having 2 or 3 carbon atoms in the oxyalkylene group and 10 to 18 carbon atoms in the alkyl or alkenyl group.

[0023] 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 predetermined number of oxyalkylene groups are added to 1 mole of the alcohol are commercially available and easily obtainable.

[0024] The oxyalkylene group of the compound (b1) is an ethylene oxide group or a propylene oxide group, and these may be contained alone or in two kinds. However, those containing both an ethylene oxide group and a propylene oxide group are preferred. The addition form of the ethylene oxide group and / or the propylene oxide group may be random or block.

[0025] The alcohol having 10 to 18 carbon atoms may be any of a linear alcohol, a branched alcohol, a saturated alcohol, and an unsaturated alcohol. Among these various alcohols, decyl alcohol (decan-1-ol), lauryl alcohol (dodecan-1-ol), tridecyl alcohol (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. These may be used alone or in combination of two or more.

[0026] Examples of commercially available products of the compound (b1) include the "Fine Surf (registered trademark)" series, "Brownon (registered trademark)" series, "Wonder Surf (registered trademark)" series manufactured by Aoki Yushi Kogyo Co., Ltd., the "Emulgen (registered trademark)" series manufactured by Kao Corporation, the "Nonion" series, "Unilube (registered trademark)" series manufactured by Nippon Yushi Co., Ltd., the "Paretex (registered trademark)" series manufactured by Miyoshi Oil & Fat Co., Ltd., the "Leox (registered trademark)" series, "Leocol (registered trademark)" series, "Lionol (registered trademark)" series manufactured by Lion Corporation.

[0027] 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. A compound in which a predetermined number of oxyalkylene groups are added to 1 mole of the fatty acid is commercially available and can be easily obtained.

[0028] The oxyalkylene group of the compound (b2) is an ethylene oxide group or a propylene oxide group, and these may be contained alone or in combination of two kinds. However, those containing both an ethylene oxide group and a propylene oxide group are preferred. The addition form of the ethylene oxide group and / or the propylene oxide group may be random or block.

[0029] The fatty acid having 10 to 18 carbon atoms may be any of a straight-chain fatty acid, a branched 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. These may be used alone or in combination of two or more.

[0030] Examples of commercially available products of the compound (b2) include the "Fine Surf (registered trademark)" series and the "Brownon (registered trademark)" series manufactured by Aoki Yushi Kogyo Co., Ltd., the "Ematon series" manufactured by Kao Corporation, the "Nonion" series manufactured by Nippon Yushi Co., Ltd., the "Unilube (registered trademark)" series, the "PereTex (registered trademark)" series manufactured by Miyoshi Yushi Co., Ltd., and the "Leo Fat (registered trademark)" series manufactured by Lion Corporation.

[0031] The compound (b3) used in the present invention is a compound obtained by adding a predetermined number of alkylene oxide groups to an alcohol compound having an alkyl group and / or an alkenyl group having 10 to 18 carbon atoms and then reacting with a fatty acid having 10 to 18 carbon atoms. It is commercially available and can be easily obtained.

[0032] The oxyalkylene group of the compound (b3) is an ethylene oxide group or a propylene oxide group, and these may be contained alone or in combination of two kinds, but those containing both an ethylene oxide group and a propylene oxide group are preferred. The addition form of the ethylene oxide group and / or propylene oxide group may be random or block.

[0033] The alcohol having 10 to 18 carbon atoms may be any of a linear alcohol, a branched alcohol, a saturated alcohol, and an unsaturated alcohol, and among them, myristyl alcohol (tetradecan-1-ol) and oleyl alcohol ((Z)-9-octadecen-1-ol) are preferred. These may be used alone or in combination of two or more.

[0034] The fatty acid having 10 to 18 carbon atoms may be any of a linear fatty acid, a branched fatty acid, a saturated fatty acid, and an unsaturated fatty acid, and oleic acid (octadecenoic acid) is preferred.

[0035] As the component (B) in the present invention, it is preferable to contain at least the compound (b1) and / or the compound (b2) from the viewpoint of the texture of the resulting paper.

[0036] The mass ratio (%) of the component A and the component B in the present invention is preferably A / B = 80 / 20 to 20 / 80, more preferably A / B = 60 / 40 to 40 / 60. By setting the proportion of the component A to 80 or less, the texture is good and the decrease in paper strength is small, and by setting it to 20 or more, sufficient flexibility can be obtained together with a good texture.

[0037] The paper softener of the present invention contains the component A and the component B in the absence of a solvent or in a solvent. Examples of the solvent include water, alcohols such as isopropyl alcohol, and the like.

[0038] When water is used as a solvent for the paper softener of the present invention, the pH can be adjusted using a pH adjuster in order to improve storage stability. Examples of the pH adjuster 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; and monoamine compounds such as ammonia.

[0039] The paper softener of the present invention can obtain a more preferable paper softener by mixing the component (A) and the component (B) at the above-mentioned ratio. By adding this paper softener to a paper stock (pulp slurry), the texture and flexibility of the paper can be improved. If the component (A) and the component (B) are added separately to the paper stock, the object of the present invention cannot be achieved. Thus, in the paper softener according to the present invention, the hydrophobic part in the component (A) and the hydrophobic part in the component (B) are gently bonded by van der Waals forces, and micelles composed of the component (A) and the component (B) are formed. Therefore, it is considered that the technical effect of the present invention, which cannot be obtained when the component (A) and the component (B) are added separately, is exhibited.

[0040] The paper softener used in the present invention is usually added at a usage ratio of 0.01 to 3% by mass, preferably 0.02 to 1.5% by mass, in total of the component (A) and the component (B) based on the absolute dry weight of the pulp. If it is less than 0.02% by mass, a sufficient texture improvement effect may not be obtained, and if it exceeds 1.5% by mass, the reduction in paper strength may be large.

[0041] Thus, the obtained paper softener of the present invention can be added to a paper stock to impart excellent texture to the paper and obtain a paper with a small reduction in paper strength.

[0042] The paper containing the fabric softener for paper of the present invention is not particularly limited, and examples include various papers and paperboards. Examples of the type 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 roll paper, sanitary papers such as tissue paper, toilet paper, towel paper, and kitchen paper, and other various papers (wood-free papers) such as notebook paper, book paper, various printing papers, and newsprint, paperboards for paper containers such as manila board, white board, and chip board, liners, and paperboards such as gypsum board base paper. Among these, sanitary paper is particularly preferred.

[0043] The paper containing the fabric softener for paper of the present invention can contain bleached or unbleached chemical pulp such as kraft pulp or sulfite pulp as pulp raw materials, groundwood pulp, bleached or unbleached high-yield pulp such as mechanical pulp or thermomechanical pulp, waste newsprint, waste magazines, waste corrugated cardboard or deinked waste paper as waste paper pulp. Further, a mixture of the above pulp raw materials and synthetic fibers such as polyamide, polyimide, polyester, polyolefin, and polyvinyl alcohol may be contained.

[0044] In producing the paper of the present invention, additives such as fillers, sizing agents, dry paper strength improvers, wet paper strength improvers, yield improvers, bulking agents, paper thickness improvers, opacifying agents, and drainage improvers may also be used as required to exhibit the physical properties required for each paper type. These may be used alone or in combination of two or more. Further, these can be premixed with the fabric softener for paper of the present invention and added to the paper stock for use, and the mixing method is not particularly limited.

[0045] Examples of the filler include clay, talc, and calcium carbonate, etc., and these may be used alone or in combination of two or more.

[0046] Examples of sizing agents include sizing agents of fatty acid soaps such as sodium stearate, rosin, fortified rosin, and rosin ester sizing agents, aqueous emulsions of alkenyl succinic anhydride, aqueous emulsions of 2-oxetanone, aqueous emulsions of paraffin wax, cationic sizing agents obtained by the reaction of carboxylic acids and polyvalent amines, and aqueous emulsions of reaction products of aliphatic oxyacids and aliphatic amines or aliphatic alcohols, cationic styrene sizing agents, and the like. These may be used alone or in combination of two or more.

[0047] Examples of dry paper strength improvers include anionic polyacrylamide, cationic polyacrylamide, amphoteric polyacrylamide, cationized starch, and amphoteric starch, etc. These may be used alone or in combination of two or more.

[0048] Examples of wet paper strength improvers include polyamide-epichlorohydrin resins, melamine-formaldehyde resins, and urea-formaldehyde resins, etc. These may be used alone or in combination of two or more. Also, the wet paper strength improver may be used before, after, or simultaneously with the addition of the paper softener of the present invention.

[0049] Examples of yield improvers include anionic, cationic, or amphoteric high molecular weight polyacrylamide, the combined use of silica sol and cationized starch, and the combined use of bentonite and cationic high molecular weight polyacrylamide, etc. These may be used alone or in combination of two or more.

[0050] Examples of drainage improvers include polyethyleneimine, or cationic, amphoteric or anionic polyacrylamide, etc. These may be used alone or in combination of two or more.

[0051] Also, surface sizing agents such as starch, polyvinyl alcohol, and acrylamide-based polymers, dyes, coating colors, surface sizing agents, anti-slip agents, and polyhydric alcohol-based humectants may be applied as necessary using a size press, gate roll coater, blade coater, calendar, or the like. These may be used alone or in combination of two or more kinds.

Examples

[0052] Hereinafter, the present invention will be specifically described with reference to examples and comparative examples, but the present invention is not limited to these examples. In each example, % is mass % unless otherwise specified.

[0053] (Example 1) Sun-dried kraft pulp (hardwood / softwood = 7 / 3) was beaten in a Niagara beater to adjust a pulp slurry with a Canadian Standard Freeness (CSF) of 550 and a concentration of 2.4%. While stirring the pulp slurry, a 1% diluted solution of the paper softener described in Example 1 of Table 1 was added so that the total of components (A) and (B) was 0.3% with respect to the absolute dry weight of the pulp. After stirring for 1 minute, paper was made using a square sheet machine to obtain a hand-made paper with a basis weight of 40 g / m 2 The obtained hand-made paper was conditioned for 24 hours under the conditions of 23°C and 50% humidity.

[0054] <Evaluation of paper> (Evaluation of texture) Two sheets of the conditioned hand-made paper obtained were overlapped so that both sides were the surfaces, and the texture was evaluated by feeling them with hands. Evaluation was conducted by 10 people, and the paper that 8 or more out of 10 people felt good in touch was rated as ◎, the paper that 5 or more and less than 8 out of 10 people felt good in touch was rated as ○, the paper that 5 or more out of 10 people felt bad in touch was rated as ×, and the others were rated as △, and the texture was evaluated in three grades. The results are shown in Table 1. Evaluation: Excellent texture ◎←○←△←×Poor texture.

[0055] (Evaluation of dry strength and flexibility) For the obtained hand-made paper after humidity conditioning, the Young's modulus was measured as an index of dry tensile strength and flexibility by the following method. The results are shown in Table 1. Dry tensile strength: Conforming to JIS P8113 Young's modulus: The ultrasonic propagation velocity V was measured using an orientation measuring instrument SST - 2500 manufactured by Nomura Shoji Co., Ltd., and the Young's modulus was determined from the following formula. A lower numerical value indicates that the paper became softer. Young's modulus ∝ ρV2 (ρ: density)

[0056] <Evaluation of Paper Softener> (Evaluation of Dilution Dispersibility) 30 milliliters of water was placed in a 50 - milliliter beaker, and while stirring at a rotation speed of 300 rpm (rotor 30 mm × 7 mm), the temperature of the working solution was adjusted to 25°C. While continuing the stirring, 0.3 milliliters of the paper softener described in Example 1 was added, and the time required to become visually uniform was measured. The shorter the time, the better the dispersibility. The results are shown in Table 1. ◎: Those that dispersed in less than 30 seconds ○: Those that dispersed in 30 seconds or more and less than 60 seconds △: Those that dispersed in 60 seconds or more and less than 120 seconds ×: Those that required 120 seconds or more

[0057] (Evaluation of Static Stability) The stability of the paper softener described in Example 1 of Table 1 when left standing at 25°C for 1 month was examined. The evaluation was as follows: ○ when the paper softener did not visually show multi - layer separation when left standing at 25°C for 1 month, and × when multi - layer separation was recognized. The results are shown in Table 1.

[0058] (Examples 2 - 10), (Comparative Examples 1 - 7) Except for changing the paper softener used in Example 1 to the paper softeners of Examples 2 - 10 and Comparative Examples 2 - 7 in Table 1, in the same manner as in Example 1, a hand - made paper with a basis weight of 40 g / m 2 was obtained. In Comparative Example 1, except for not using a paper softener, in the same manner as in Example 1 above, a hand - made paper with a basis weight of 40 g / m 2Handmade paper was obtained. The obtained handmade paper was conditioned for 24 hours under the conditions of 23°C and 50% humidity. The texture, dry tensile strength, and Young's modulus of the conditioned handmade paper were measured in the same manner as in Example 1 above. Also, the dispersibility and static stability of the paper softeners in Examples 2 to 10 and Comparative Examples 2 to 7 in Table 1 were measured in the same manner 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 and measured. The measurement results are shown in Table 1.

[0059]

Table 1

[0060] (Example 11) Sun-dried kraft pulp (hardwood / softwood = 7 / 3) was beaten in a Niagara beater to adjust 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, and then a 1% dilution of the paper softener described in Example 11 of Table 2 was added so that the total of component (A) and component (B) was 0.3% based on the absolute dry weight of the pulp. After stirring for 1 minute, paper was made using a rectangular sheet machine to obtain a hand-sheeted paper with a basis weight of 40 g / m 2 2. The obtained hand-sheeted paper was conditioned at 23 °C and 50% humidity for 24 hours. The texture, dry tensile strength, and Young's modulus of the conditioned hand-sheeted paper were measured by the same method as in Example 1 above. Also, the dispersibility and static stability of the paper softener described in Example 11 of Table 2 were measured by the same method as in Example 1 above. The measurement results are shown in Table 2.

[0061] (Examples 12 - 17), (Comparative Examples 8 - 10) 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, in the same manner as in Example 11, a hand-sheeted paper with a basis weight of 40 g / m 2 2 was obtained. In Comparative Example 8, except for not using a paper softener, in the same manner as in Example 1 above, a hand-sheeted paper with a basis weight of 40 g / m 2 2 was obtained. The obtained hand-sheeted paper was conditioned at 23 °C and 50% humidity for 24 hours. The texture, dry tensile strength, and Young's modulus of the conditioned hand-sheeted paper were measured by the same method as in Example 1 above. Also, the dispersibility and static stability of the paper softeners of Examples 12 - 17 and Comparative Examples 9 and 10 in Table 2 were measured by the same method as in Example 1 above. The measurement results are shown in Table 2.

[0062]

Table 2

[0063] As shown in Table 1 and Table 2, the internal addition paper containing the paper softeners of Examples 1 to 17 that satisfy the configuration of the present invention can obtain paper with excellent flexibility and texture compared to Comparative Examples 2 to 10 that lack either one of the Component A and Component B specified in the present invention.

Claims

1. As component (A), (a1) Polyoxyalkylene monoalkylamine or polyoxyalkylene monoalkenylamine (a2) Polyoxyalkylene monoalkylpropylenediamine or polyoxyalkylene monoalkenylpropylenediamine At least one selected therefrom, wherein the oxyalkylene group has 2 or 3 carbon atoms and the alkyl or alkenyl group has 8 to 18 carbon atoms and As component (B), (b1) Polyoxyalkylene monoalkyl ether or polyoxyalkylene monoalkenyl ether (b2) Polyoxyalkylene monoalkyl ester or polyoxyalkylene monoalkenyl ester (b3) Polyoxyalkylene monoalkyl ether monoalkenyl ester or polyoxyalkylene monoalkenyl ether monoalkenyl ester At least one selected therefrom, wherein the oxyalkylene group has 2 or 3 carbon atoms and the alkyl or alkenyl group has 10 to 18 carbon atoms A paper softener containing the same.

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

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

4. The paper softener according to claim 3, wherein component (B) is (b1) and contains an ethylene oxide group and a propylene oxide group as the oxyalkylene group. The paper softener according to claim 3.

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

6. A paper characterized by containing 0.01 to 3% by mass of the paper softener according to any one of claims 1 to 5.

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