JPH07189170A - Softener for paper - Google Patents

Abstract

PURPOSE:To obtain a softener for papers containing pyrrolidonecarboxylic acid or its salt and/or a specific betaine and capable of imparting softness and moisture retention to papers. CONSTITUTION:A softener for papers capable of imparting softness and elasticity to papers is obtained by compounding 1-100 pts.wt. of pyrrolidonecarboxylic acid or its salt (a sodium or potassium salt) and/or a betaine of the formula optionally in combination with e.g. a known tertiary ammonium salt. The obtained softener is added to a pulp slurry e.g. during a paper making process to obtain a paper product exhibiting moisture retention and soft feeling while keeping hygroscopicity and strength of papers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a toilet paper,
The present invention relates to a softening agent for paper which imparts flexibility and elasticity (puffiness) to sanitary thin paper such as dust paper, facial tissue, Kyohana paper, paper napkin, paper towel, wiper, sanitary paper, diaper paper and the like.

[0002]

2. Description of the Related Art Household paper products such as toilet paper, tissue paper, disposable diaper paper towels, etc. are required to have appropriate softness for their use. It is considered that the flexibility of paper is expressed by complicatedly involving many factors such as the type of fiber, the density of paper, and the water content of paper.
Glycerin, fatty acid esters, paraffin emulsions, quaternary ammonium salts and the like have been used as agents for imparting flexibility to paper.

However, the softening agent using such a compound can surely impart flexibility to the paper, but on the other hand, it has a drawback that it reduces the water absorption and strength of the paper.

As a softening agent for solving this problem, a softening agent containing a dilong-chain alkyl quaternary ammonium salt (Japanese Patent Laid-Open No. 63-165597), a dialkyl type quaternary ammonium salt and glycerin, and water or carbon. A softening agent containing an aliphatic alcohol having a number of 4 or less (JP-A-4-10099).
5), a softener containing lanolin and a lanolin derivative (JP-A-53-147803), a softener containing urethane alcohol or a quaternary compound thereof (JP-A-60-13).
No. 9897), a softener containing a cationic oligomer (JP-A-63-251409), a softener containing a polyamide derivative (JP-A-51-38600), and the like.

[0005]

However, since the types of paper, the uses of paper, the demands of consumers, etc. are diversified today, it is difficult to sufficiently deal with the above-mentioned softening agents. In addition to imparting good flexibility and water absorbency to a softening agent, it is desired to provide a softening agent having further superior performance in that it can provide a moisturizing property to paper and provide a product with a moist feel. .

[0006]

As a result of intensive studies to solve the above problems, the present inventors found that pyrrolidonecarboxylic acid or a salt thereof and / or a specific betaine has not only flexibility but also moisturizing property on paper. They have found that they can be imparted, and have completed the present invention.

That is, the present invention provides a softening agent for paper containing 1 to 100% by weight of pyrrolidonecarboxylic acid or a salt thereof and / or betaine represented by the following formula (I). .

[0008]

[Chemical 2]

The softener for paper of the present invention contains 1 to 100% by weight, preferably 1 to 70% by weight, more preferably 5% by weight of pyrrolidonecarboxylic acid or a salt thereof and / or betaine represented by the formula (I). ˜50% by weight. As the salt of pyrrolidonecarboxylic acid, alkali metal salts such as sodium salt and potassium salt are preferable.

The softening agent of the present invention may be a solid form consisting of pyrrolidonecarboxylic acid or a salt thereof and / or 100% by weight of betaine represented by the above formula (I), or, if necessary, this. Even if it is in a solid state consisting of other components to be blended, these are further added in an amount of 10 to 50.
It may be in a liquid form such as an aqueous solution containing wt%. In the case of a solid softener, it is generally used as an aqueous solution containing a desired concentration at the time of use, for example, about 10 to 50% by weight of pyrrolidonecarboxylic acid or a salt thereof and / or betaine represented by the above formula (I). However, when it is added to the pulp slurry, it can be used as it is.
In the case of a liquid softener such as an aqueous solution, it can be diluted to a desired concentration before use.

The known softening agents for paper of the present invention include
A quaternary ammonium salt, a silicone-based softening agent, or an optional component used in this field can be used in combination. When the optional components are blended, the pyrrolidonecarboxylic acid or salt thereof and / or the betaine represented by the formula (I) is 1 to 9
5% by weight, preferably 5-40% by weight, the total amount of optional components is 1-80% by weight, preferably 5-60% by weight, and water is 0%.
~ 98% by weight. Also in this case, the blending amount of water is 0.
Weight%, that is, even when water is not blended, it is generally used by diluting with water during actual use.

The softening agent for paper of the present invention can be used by directly adding it to pulp slurry during paper making, or
A wire part that obtains wet paper by a Fourdrinier paper machine or a cylinder paper machine by diluting with 1000 times water to prepare a treatment liquid, a press part that presses this wet paper for dehydration, and a dry that heat-drys subsequently. A coating part containing a coater for coating the paper after the part or the dry part,
In any process such as rewind part manufacturing toilet paper etc., impregnation with an impregnating machine,
It is possible to spray with a sprayer or to apply with a coater. In any case, the added amount of softness (solid content) is 0.01 to 1 with respect to pulp or paper.
It is 0% by weight, preferably 0.01 to 5% by weight. If the amount added is less than 0.01% by weight, the distribution state on the paper becomes non-uniform, and a sufficient effect cannot be obtained. 10% by weight
If it exceeds the range, stickiness may occur, paper strength may be reduced, or operability may be poor.

[0013]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

Example 1 A raw pulp slurry consisting of 40% deinked pulp obtained by deinking a milk carton and 60% bleached hardwood kraft pulp was beaten to a freeness of 620 to 630 ml (CSF), and the concentration of the slurry was 1%. Adjusted to. To this pulp slurry, the softening agents shown in Tables 1 and 2 were added to the pulp.
After adding the amount shown in 2 and stirring sufficiently, a thin paper of 13 g / cm ² was made into paper by a conventional method. For the performance evaluation, five test papers were gripped with one hand, and a sensory evaluation of flexibility and moisture retention was performed. The results are shown in Tables 1 and 2. The evaluation criteria are the following five-level evaluation, and the numerical values in the table are average values of 10 persons. [Flexibility] 1: Not soft 2: Same as when no softener is used 3: Slightly soft 4: Soft 5: Very soft [Moisturizing] 1: Not moist 2: Same as when no softener is used 3: Slightly moist 4: Moist 5: Very moist

[0015]

[Table 1]

[0016]

[Table 2]

Claims (1)

[Claims] 1. 1 to 100 of pyrrolidonecarboxylic acid or a salt thereof and / or betaine represented by the following formula (I):
Softening agent for paper containing by weight%. [Chemical 1]