JP2002275792A - Bulk softener and bulky soft paper containing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing paper having sufficient bulkiness and softness. SOLUTION: This printing paper is obtained by incorporating a paper stock with a bulk softener of the general formula (1): R1 COO(AO)n R2 (wherein, R1 is H, a 1C, 2C, or 12-22C straight-chain or branched alkyl, or straight-chain or branched unsaturated hydrocarbon group, and may be substituted with an aromatic ring; AO denotes an alkylene oxide addition polymer, being at least one kind selected from ethylene oxide, propylene oxide, and butylene oxide; n is an integer of 0-50; and R2 is a 8-22C straight-chain or branched alkyl or straight-chain or branched unsaturated hydrocarbon group, and may be substituted with an aromatic ring).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulky softener and a paper which is bulky and excellent in flexibility.

[0002]

2. Description of the Related Art Comic books and paperbacks have rapidly become widespread, reflecting the recent divergence in printing. Along with this,
Paper is also required to be lightweight and flexible. here,
The term “weight reduction of paper” refers to weight reduction while maintaining the thickness of the paper, that is, bulking (low density). At present, environmental issues are being raised, and light weight of paper is an unavoidable issue for the effective use of paper pulp produced from forest resources. In addition, flexibility is the stiffness of the paper while maintaining the thickness of the paper, that is, the suppleness of the paper that can keep the open state sufficiently without opening naturally when the book is opened. Point to.

[0003] As a method for increasing the bulk of paper, a method using crosslinked pulp (Japanese Patent Application Laid-Open No. 4-185792), a method by mixing with synthetic fibers (Japanese Patent Application Laid-Open No. 3-269199, etc.), inorganic substances between pulp, etc. (Japanese Unexamined Patent Publication No. 3-269199) and a method using expandable particles (Japanese Unexamined Patent Publication No. 5-230798, Japanese Unexamined Patent Publication No. 11-200282). However, the use of crosslinked pulp, synthetic fibers and the like makes paper recycling impossible. Also, the method of filling the filling material between the pulp and the method using the expandable particles significantly reduces the paper strength. Also, a method using a surfactant (WO098 / 03730)
JP, JP-A-11-200283, JP-A-11-200284, JP-A-11-200285, JP-A-11-269799,
JP-A No. 11-350380) has also been reported.

On the other hand, it is considered that the flexibility of paper is expressed by many factors such as fiber type, paper density, and paper moisture. Household paper products, for example, toilet paper, tissue paper, etc., require moderate softness for their applications, and many softeners have been developed so far, such as glycerin, polyethylene glycol, urea, and paraffin. It is known that emulsions, quaternary ammonium salts and the like have the effect of giving paper flexibility. In addition, a softener containing a di-long-chain alkyl type quaternary ammonium salt (JP-A-63-165597, JP-A-8-165597)
JP-A-296197), a softener containing di-long-chain alkyl-type quaternary ammonium salt and glycerin, and water or an aliphatic alcohol having 4 or less carbon atoms (JP-A-4-100995).
Softeners containing lanolin and lanolin derivatives
53-147803), a softener containing urethane alcohol or a quaternary compound thereof (JP-A-60-139897), and a softener containing a cationic oligomer (JP-A-63-251049)
Japanese Patent Application Laid-Open (JP-A) no.
51-38600), pyrrolidonecarboxylic acid or a salt thereof (JP-A-7-189170) and the like have also been reported.

[0005] In recent years, with the increase in environmental problems and the increase in the recycling rate of waste paper, the tendency of actively blending waste paper pulp into high-quality paper has been increasing. Is increasing. However, when the amount is too large, problems such as a decrease in whiteness and opacity occur, and it is necessary to solve these problems. As a method to make paper including waste paper bulky,
Method using surfactant (JP-A-2000-282398, etc.)
Have been reported.

However, even when these bulking agents and softening agents are used in the actual papermaking process, the effects of bulking and softening may not be sufficiently exerted, or the effect of softening may be obtained although the effect of bulking is provided. Was inadequate.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a printing paper exhibiting sufficient bulkiness and having excellent flexibility.

[0008]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, the following general formula (1)
It has been found that by using the bulky softener represented by the formula (1), a paper exhibiting sufficient bulkiness and having excellent flexibility can be obtained, and the present invention has been completed.

R ₁ COO (AO) _n R ₂ (1)

(R ₁ is hydrogen or has ₁ , 2, 12 to
22 linear or branched alkyl groups or unsaturated hydrocarbons. Further, R ₁ may be substituted with an aromatic ring. A
O represents an alkylene oxide addition polymer, and is at least one selected from ethylene oxide, propylene oxide, and butylene oxide. n is an integer from 0 to 50. R ₂ is a linear or branched alkyl group having 8 to 22 carbon atoms, or an unsaturated hydrocarbon. In R _2, the alkyl group may be substituted with an aromatic ring. )

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

Although the mechanism of the expression of the bulky softening agent is not clearly understood, the bulky softening agent is fixed to the pulp fiber during papermaking, and the surface of the pulp fiber having extremely high hydrophilicity is hydrophobized. It is considered that bulkiness and flexibility are expressed by increasing the bonding distance between the fibers by repelling. In order for the bulky softener to be efficiently fixed on the pulp fiber surface, a bulky softener needs a hydrophilic group having a high affinity for pulp fibers having extremely high hydrophilicity. In order to make the surface of pulp fibers having extremely high hydrophilicity hydrophobic, it is indispensable to have a structure with considerably high hydrophobicity. From the above, the bulky softener is a compound having both a hydrophilic group and a hydrophobic group in the molecule, that is, a surfactant is one of the candidate compounds.

Representative examples thereof include nonionic surfactants such as alkylene oxide adducts of higher alcohols and higher fatty acids. Specifically, as an alkylene oxide adduct of a higher alcohol, Emulgen 109P (trade name) of Kao Corporation, Emulmin (trade name) of Sanyo Chemical Industry Co., Ltd., and Newcol 704 (trade name of Nippon Emulsifier Co., Ltd.) ) And the like,
Ionnet MS-1000 (trade name) of Sanyo Chemical Industries, Ltd. as an alkylene oxide adduct of a higher fatty acid;
Newcol 170 (trade name) of Nippon Emulsifier Co., Ltd. and the like.

However, these surfactants are obtained by adding ethylene oxide to a higher alcohol or higher fatty acid, and are advantageous in terms of cost or reactivity as compared with other alkylene oxides. Has higher hydrophilicity than higher alcohols and higher fatty acids as raw materials. Therefore, the affinity for water is higher than the affinity for pulp fibers, and even if a cationic fixing agent or the like is used, the yield to pulp fibers is poor, and the expected bulkiness and flexibility are hardly exhibited.

The present inventors have found that a bulky softening agent has a sufficient effect.
Ethylene of higher alcohols and higher fatty acids without fruit
Esterification of hydroxyl (OH) residue of oxide adduct
Further, the compound represented by the above general formula (1) is remarkable.
It has been found that it exhibits a high bulky softening effect. In general formula (1)
R₁Represents hydrogen or a straight chain having 1, 2, 12 to 22 carbon atoms.
Or a branched alkyl group or unsaturated hydrocarbon.
And preferably a straight-chain alkyl group having 12 to 22 carbon atoms.
Also, R₁May be substituted with an aromatic ring,
You may mix and use two or more types. AO is alkylene
Oxide addition polymer, ethylene oxide,
Selected from propylene oxide and butylene oxide
At least one of ethylene oxide and propylene
It is preferably an oxide. n is from 0 to 50
Indicates an integer. In addition, two or more alkylene oxides
The polymerization method used is block polymerization or random polymerization.
Either may be used. R₂Is a straight or branched chain having 8 to 22 carbon atoms
Alkyl group or unsaturated hydrocarbon, preferably
Is a linear alkyl group having 12 to 22 carbon atoms. Also, R ₂Is
It may be substituted with an aromatic ring.

Although the bulky softener of the present invention has an esterified OH residue at the terminal, it does not become completely hydrophobic, and has an alkylene oxide moiety present at the center of the molecule to be used as a surfactant. Maintains some properties. Therefore, it is considered that the balance between the hydrophilicity and the hydrophobicity is only inclined toward the more hydrophobic side, the adsorption to the pulp fiber is higher than the affinity for water, and the bulky and softening effect is efficiently exhibited. Further, it is considered that the oxygen atom in the alkylene oxide portion forms chelation with the aluminum ion, and the chelate composite exhibits an extremely strong binding force with the pulp fiber.

The bulky softener of the present invention is usually liquid at ordinary temperature, but when it has a large number of carbon atoms of R ₁ and R ₂ , it tends to become a solid or gel, and even if it is a liquid, it has a high viscosity. Is obtained. Further, when R ₁ and R ₂ have an unsaturated bond or a branched structure, the properties of the liquid are easily exhibited. Also,
For the repeating unit of the alkylene oxide moiety,
When the number of ethylene oxide units increases, it tends to become solid, and when the number of propylene oxide units increases, it tends to become liquid.

Specific examples of the bulky softener of the present invention include the compounds shown in Table 1, but are not limited thereto.

[0019]

[Table 1] The method for producing the bulky softener of the present invention is not particularly limited. (A) After reacting an alcohol compound with an alkylene oxide, a carboxylic acid, a carboxylic acid chloride or a carboxylic anhydride is reacted. (B) an alkyl etherification reaction is carried out after reacting the carboxylic acid with the alkylene oxide; (C) an alkyl etherification reaction is carried out on one of the hydroxyl groups of the polyalkylene glycol compound, and then the other hydroxyl group is given a carboxylic acid or a carboxylic acid. Reacting an acid chloride or a carboxylic anhydride with (D) an esterification reaction of one of the hydroxyl groups of the polyalkylene glycol compound using a carboxylic acid, a carboxylic acid chloride or a carboxylic anhydride, followed by the other one; Four types of methods, such as performing an etherification reaction on a hydroxyl group, are preferable, and in particular, (A) Is preferred in terms of yield and operability.

The reaction between the alcohol and the alkylene oxide is carried out in a solvent or without solvent by heating under reflux or heating in an autoclave. A catalyst may be added to obtain a compound having a high degree of polymerization.

The esterification reaction in the above-mentioned methods (A), (C) and (D) is not particularly limited.
(E) A reaction of dehydrating and condensing an alcohol compound or a polyalkylene glycol compound with a carboxylic acid using a mineral acid, an organic acid, a Lewis acid, an acidic ion exchange resin, DCC, etc. as a catalyst, and (F) a pyridine compound as a base An aromatic and aliphatic amine compound, a urea compound, a reaction of condensing an alcohol compound or a polyalkylene glycol compound with a carboxylic acid chloride by using a metallic magnesium or alkali aqueous solution (Schotten-Baumann method), or the like;
(G) Reaction of condensing an alcohol compound or a polyalkylene glycol compound with a carboxylic anhydride using a mineral acid, an organic acid, a Lewis acid, a pyridine compound, an aromatic or aliphatic amine compound, calcium carbide, or the like as a catalyst. , (H) a reaction of condensing an alcohol compound or a polyalkylene glycol compound with a carboxylic acid ester using a mineral acid, an organic acid, potassium alkoxide, potassium cyanide or the like as a catalyst (reaction when the carboxylic acid ester is a methyl ester) When molecular sieves 5A coexist in the system, the reaction is further promoted).
Different methods are preferred, and methods (E) and (F) are particularly preferred in terms of yield and operability.

A bulky softening agent having a high HLB value and not having sufficient hydrophobicity cannot hydrophobize the fiber, and may not exhibit the desired bulky softening effect. Therefore, in order to impart sufficient hydrophobicity to the fiber, the HLB value is preferably 10 or less, particularly preferably 6 or less.

On the other hand, if the hydrophobicity is too high, it is difficult to efficiently emulsify in water, and it is not possible to uniformly adsorb the fibers, and as a result, sufficient bulkiness and flexibility cannot be obtained. Therefore, when a bulky softener having high hydrophobicity is used, it is important to form a uniform emulsion by using a surfactant having an excellent emulsifying ability in order to sufficiently emulsify in water. Some bulky softeners have self-emulsifying properties,
When using a bulky softener having high hydrophobicity, it is preferable to add an emulsifier in the range of 0.1% by weight or more and 30% by weight or less with respect to the bulky softener. In order to achieve this, it is more preferable to add it in the range of 0.5% by weight to 10% by weight.

As the emulsifier, anionic, cationic,
Various surfactants such as nonionic and amphoteric are used.Especially, the use of one or more cationic emulsifiers such as cationized starch and quaternary ammonium salt reduces the generation of bubbles and improves workability. Very good. In particular, among quaternary ammonium salts, at least a long-chain alkyl group
Use of a quaternary ammonium salt having one promotes a bulky and softening effect. Further, the cationized starch has a function of improving the emulsion stability of the bulky softener of the present invention, which is a nonionic compound, and increasing the yield to pulp fibers. Further, the long-chain alkyl quaternary ammonium salt which is a softener for fibers has a bulky softening action itself, but has an action of enhancing the emulsion stability and the yield of the bulky softener of the present invention, A sufficient effect is shown even with a small addition amount.

Specific examples of the surfactant used for emulsifying the bulky softener of the present invention include the following compounds. That is, Rex OT-P (Kao Corporation)
Demol EP (manufactured by Kao Corporation), Disper TL
Anionic surfactants such as (Aseisei Chemical Co., Ltd.), Goseilan L-3266 (Nippon Synthetic Chemical Co., Ltd.), Alon T-40 (Toa Gosei Chemical Co., Ltd.), Emulgen (Kao Corp.) ), Emulmin (Sanyo Chemical), Span # 2
Nonionic surfactants such as 0,40,60,80,83,85 and Tween20,40,60,80,85, Cation DS (Sanyo Chemical Co., Ltd.)
, Coatamine 86W (manufactured by Kao Corporation), Coatamine D86P (manufactured by Kao Corporation), and the like, but are not limited thereto.

Since the bulky softening agent is a factor inhibiting the bonding between the pulp fibers, the strength of the paper is generally reduced, and the bulky softness of the paper is exhibited. However, even if the amount of addition is increased beyond a certain level, the effect will level out. Generally, it is preferable to add a bulk softening agent to the raw pulp in an amount of 0.1% by weight or more and 20% by weight or less. However, if the amount is too large, the friction coefficient of the paper may be extremely changed, which may affect the general paper quality. On the other hand, if the amount is too small, the bulky softening effect may not be sufficiently exhibited depending on the type of the bulky softener or pulp.
More preferably, it is added in the range of 0.2% by weight or more and 5% by weight or less.

The bulky flexible paper of the present invention is produced from various types of pulp by a usual papermaking process. Raw pulp includes chemical pulp (bleached or unbleached kraft pulp of softwood, bleached or unbleached kraft pulp of hardwood, etc.), mechanical pulp (ground pulp, thermomechanical pulp, chemithermomechanical pulp, etc.), deinked pulp, etc. They can be used alone or mixed in an arbitrary ratio. In addition, even when mechanical pulp or waste paper is included in the pulp used as a raw material for paper, the bulk softening agent of the present invention exhibits good bulk softness. The pH at the time of papermaking may be acidic, neutral or alkaline.

The bulky flexible paper of the present invention may contain a filler. As the filler, commonly used fillers can be used and are not particularly limited. For example, clay,
Calcined clay, diatomaceous earth, talc, kaolin, calcined kaolin, delamikaolin, heavy calcium carbonate, light calcium carbonate, magnesium carbonate, barium carbonate, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, aluminum hydroxide, water Inorganic fillers such as calcium oxide, magnesium hydroxide, and zinc hydroxide, and organic fillers such as urea-formalin resin, polystyrene resin, phenolic resin, and fine hollow particles are used alone or in appropriate combination of two or more kinds.

In order to produce the paper containing the bulky softener of the present invention, the bulky softener may be added as it is or an emulsion of the bulky softener may be added to the pulp slurry (so-called internal addition) in a usual papermaking process. . The place to be added is not particularly limited as long as it can be uniformly mixed with the pulp slurry.

In producing the bulky flexible paper of the present invention, papermaking such as various nonionic and cationic retention agents, freeness improving agents, paper strength improving agents, internal sizing agents and the like conventionally used. An internal additive is appropriately selected and used as needed.

Examples of the internal additive for papermaking include basic aluminum compounds such as a sulfuric acid band, aluminum chloride, sodium aluminate, basic aluminum chloride and basic polyaluminum hydroxide, and alumina sol which is easily decomposed in water. And polyvalent metal compounds such as ferrous sulfate and ferric sulfate, and silica sol.

Next, examples of the sizing agent include alkyl ketene dimer compounds, alkenyl succinic anhydride compounds, styrene-acrylic compounds, higher fatty acid compounds, petroleum resin sizing agents and rosin sizing agents.

Other auxiliaries for papermaking include starches, polyacrylamides, urea resins, melamine resins, epoxy resins,
Examples thereof include various compounds such as polyamide resin, polyamide, polyamine resin, polyamine, polyethyleneimine, vegetable gum, polyvinyl alcohol, latex, polyethylene oxide, dispersion of hydrophilic crosslinked polymer particles, and derivatives or modified products thereof.

Further, papermaking internal additives such as dyes, fluorescent brighteners, pH adjusters, defoamers, pitch control agents, slime control agents and the like can be appropriately added according to applications. In addition, the method for producing a bulky flexible paper of the present invention is based on papermaking p
H is about 4.5 by acidic papermaking, or contains an alkaline filler such as calcium carbonate as a main component,
There is no particular limitation on whether or not the papermaking pH is a weak acidity of about 6 to a weak alkalinity of about 9, so-called neutral papermaking, and paper obtained by any papermaking method is targeted.
As the paper machine, a fourdrinier paper machine, a twin wire machine, a Yankee paper machine or the like can be used as appropriate.

The bulky flexible paper of the present invention is suitable as, for example, offset printing paper. In addition, letterpress printing paper,
It can also be used as base paper for information recording paper such as electrophotographic paper or ink jet recording paper, thermal recording paper, pressure-sensitive recording paper, PPC paper, foam paper, and the like. Also,
Use as a base paper for coated paper is also a preferred embodiment. In recent years, with the increase in environmental problems, a tendency to use a high amount of waste paper pulp has been observed everywhere. The bulky soft material of the present invention shows remarkable bulkiness regardless of the amount of waste paper pulp. Therefore, it is effective not only for newsprint but also for paperboard and white paperboard.

[0036]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples. The following items were measured and evaluated for the handmade papers manufactured in Examples and Comparative Examples. The results are shown in Table 2. -Density: Based on JIS P8118. Clark stiffness: based on JIS P 8143.

Example 1 10.0 g of the compound 6 shown in Table 1 was used as a bulking softener, and Emulgen 90 was used as an emulsifier.
5 (manufactured by Kao Corporation) and well added to 100 g of water.
The mixture was stirred for a minute to prepare an emulsion of a bulky softener.

LBKP (freeness CSF)
350 ml). To this, a stock was prepared by adding the above-mentioned emulsified liquid of the bulk softening agent so as to be 1.0% by weight per pulp. Then, using a round-shaped hand plow, the basis weight is 60 g /
Papermaking such that m ^2, and pressed at an effective pressing pressure of 4.18kg / cm ^2, environmental testing machine (paper surface temperature 70 ° C., the heating temperature
(105 ° C.) for 1 hour to obtain a handmade paper.

Example 2 10.0 g of the compound 7 shown in Table 1 was used as a bulking softener, and Emulgen 90 was used as an emulsifier.
Hand-made paper was obtained in the same manner as in Example 1 except that 0.15 g of 5 (manufactured by Kao Corporation) was used to prepare an emulsified liquid of a bulky softener.

Example 3 10.0 g of the compound shown in Table 1 was used as a bulking softener, and Perex OT was used as an emulsifier.
Hand-made paper was obtained in the same manner as in Example 1 except that 0.15 g of -P (manufactured by Kao Corporation) was used to prepare an emulsified liquid of a bulky softener.

Example 4 10.0 g of the compound shown in Table 1 was used as a bulking softener, and cationic DS was used as an emulsifier.
Hand-made paper was obtained in the same manner as in Example 1 except that 0.1 g of the product (manufactured by Sanyo Chemical Co., Ltd.) was used to prepare an emulsified liquid of a bulk softener.

Example 5 10.0 g of the compound shown in Table 1 was used as a bulking softener, and Span # 20 0.1 was used as an emulsifier.
g, and a handmade paper was obtained in the same manner as in Example 1 except that an emulsified liquid of a bulky softener was prepared using g.

Example 6 10.0 g of the compound shown in Table 1 was used as a bulking softener, and emulmin 5 was used as an emulsifier.
Hand-made paper was obtained in the same manner as in Example 1 except that 0.15 g of 0 (manufactured by Sanyo Chemical Industries, Ltd.) was used to prepare an emulsified solution of a bulky softener.

Example 7 10.0 g of the compound shown in Table 1 was used as a bulking softener, and Perex T was used as an emulsifier.
A hand-made paper was obtained in the same manner as in Example 1 except that 0.15 g of R (manufactured by Kao Corporation) was used to prepare an emulsion of a bulk softening agent.

Example 8 As a bulk softener, 10.0 g of the compound 17 shown in Table 1 was used, and Emulgen A was used as an emulsifier.
Hand-made paper was obtained in the same manner as in Example 1, except that 0.15 g of -60 (manufactured by Kao Corporation) was used to prepare an emulsified liquid of a bulk softener.

Example 9 A mixture of 7.0 g of the compound 14 and 3.0 g of the compound 15 shown in Table 1 as a bulking softener, and 0.1 g of Perex CS (manufactured by Kao Corporation) as an emulsifier
A handmade paper was obtained in the same manner as in Example 1 except that an emulsion of a bulky softener was prepared using

Example 10 A mixture of 3.0 g of compound 14 and 7.0 g of compound 15 shown in Table 1 was used as a bulking softener, and Newcol 170 (Nippon Emulsifier Co., Ltd.) was used as an emulsifier.
Hand-made paper was obtained in the same manner as in Example 1 except that an emulsified solution of a bulky softener was prepared using 0.2 g of the same.

Comparative Example 1 Hand-made paper was obtained in the same manner as in Example 1 except that 10.0 g of Emulgen 109P (manufactured by Kao Corporation) was added instead of compound 6 shown in Table 1.

Comparative Example 2 A hand-made paper was obtained in the same manner as in Example 1 except that 10.0 g of Newcol 704 (manufactured by Nippon Emulsifier Co., Ltd.) was added instead of compound 6 shown in Table 1. .

Comparative Example 3 In place of compound 6 shown in Table 1, 10.0 g of ionet MS-1000 (manufactured by Sanyo Chemical Industries, Ltd.)
A hand-made paper was obtained in the same manner as in Example 1 except that was added.

Comparative Example 4 A hand-made paper was obtained in the same manner as in Example 1 except that 10.0 g of Newcol 170 (manufactured by Nippon Emulsifier Co., Ltd.) was added instead of compound 6 shown in Table 1. .

Comparative Example 5 Hand-made paper was obtained in the same manner as in Example 1 except that Compound 6 shown in Table 1 was not added.

[0053]

[Table 2] As shown in Table 2, when Examples 1 to 10 and Comparative Example 5 are compared, it is found that the use of the compound represented by the general formula (1) as the bulking softener improves the bulkiness and the flexibility. Was. In addition, the compounds having a hydroxyl group in the molecule of Comparative Examples 1 to 4 could not sufficiently impart hydrophobicity to paper because of low hydrophobicity. As a result, the bulky softening effect was lower than in Examples 1 to 10.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mitsutoshi Nakamura 5-2-1-1, Oji, Kita-ku, Tokyo Nippon Paper Industries Co., Ltd. (72) Inventor Masafumi Ishida 5-2-1-1, Oji, Kita-ku, Tokyo No. Nippon Paper Industries Co., Ltd. (72) Inventor Yasunori Minamisato 5-21-1, Oji, Kita-ku, Tokyo Nippon Paper Industries Co., Ltd. F-term (reference) 4L055 AC06 AG34 AH50 EA30 EA32 FA16 GA08 GA15

Claims (2)

[Claims] 1. A bulky softener represented by the following general formula (1). R ₁ COO (AO) _n R ₂ (1) (wherein, R ₁ is hydrogen, or a linear or branched alkyl group having ₁ to 2, 12 to 22 carbon atoms, or a linear or branched unsaturated carbon atom) A hydrogen group, R ₁ may be substituted with an aromatic ring, AO represents an alkylene oxide addition polymer, and ethylene oxide, propylene oxide,
It is at least one selected from butylene oxide. n is an integer from 0 to 50. R ₂ is a linear or branched alkyl group having 8 to 22 carbon atoms, or a linear or branched unsaturated hydrocarbon group. R ₂ may be substituted with an aromatic ring. ) 2. A bulky soft paper comprising the bulk softener according to claim 1 in an amount of 0.1% by weight or more and 20% by weight or less based on the absolute dry weight of pulp.