JPH05161566A - Unwoven cloth - Google Patents

Abstract

PURPOSE:To prevent discoloration of a cellulose based unwoven cloth even when the cloth is left alone at a high temperature in the air or under a wet condition for a long time by adding an amine salt to the unwoven cloth exceeding a specified weight. CONSTITUTION:In an unwoven cloth containing a cellulose based fiber, one kind or more of amine salts are contained at a rate of 0.015wt.% per the cloth. The discoloration of the unwoven cloth can be prevented as the cationic amine salts are adsorbed by an anionic cellulose active part to make an obstacle to an oxidizing substance such as molecular oxygen in the air so that the oxidation of cellulose can be checked remarkably. Any unwoven cloth is applicable only if it contains the cellulose fiber. Lysine hydrochloride is preferably selected as a primary amine, an alkyl diaminoethylglycine hydrochloride or the like as a secondary amine and cetylpyridinium chloride as a tertiary amine. The upper limit of the amount of addition determined optionally viewed from the safety and costs of the amine salts.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a nonwoven fabric containing cellulosic fibers. More specifically, the present invention relates to a non-woven fabric which is less likely to be colored and denatured with the passage of time and is useful as a cleaning material for wet tissues and wet towels for objectives or personal use.

[0002]

2. Description of the Related Art Cellulose fibers have a property that when left at high temperature for a long time, a part of the cellulose is transformed and colored yellow, and there is a drawback that coloring is more likely in a wet state. Traditionally, colored cellulosic fiber materials are
It is known to be decolorized by oxidative bleaching. For example, Japanese Examined Patent Publication (Kokoku) No. 3-35428 proposes a method of oxidatively bleaching a cellulosic material such as woven cloth at various processing stages with a hydrogen peroxide aqueous solution containing a stabilizer.

According to this proposal, a woven fabric after bleaching is sufficiently rinsed with hot water or cold water and then dried to obtain a woven fabric from which coloring substances or coloring-causing substances are washed and removed. Also regarding cellulosic fibers used for cleaning agents,
Bleaching is performed in the processing stage. However, when the cellulosic fiber, especially the processed fiber product, is left in a place where it is likely to become hot, such as in summer stores, in cars, and in outdoor warehouses, a part of it is denatured and gradually colored. There are no suggestions to prevent them from coming.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to include a cellulosic fiber which is difficult to be color-modified even when left in the air for a long time, particularly when exposed to a high temperature in a wet state for a long time. To provide a non-woven fabric.

[0005]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the inventors of the present invention have added an amine salt in an amount of 0.015% by weight or more to the nonwoven fabric, thereby producing a cellulose-based nonwoven fabric. It has been found that the coloring modification of the above can be prevented even when left for a long time under a high temperature in a wet state.

That is, the present invention is a nonwoven fabric containing cellulosic fibers, wherein one or more amine salts are contained in an amount of 0.015% by weight or more based on the above nonwoven fabric. This color modification can be prevented because the cationic amine salt is adsorbed by the anionic cellulose active part, which serves as a barrier against oxidative substances such as molecular oxygen in the air, resulting in the oxidation of cellulose. It is presumed that this is because it is significantly suppressed.

The non-woven fabric in the present invention may be any non-woven fabric containing cellulosic fibers. Further, the cellulosic fiber used in the present invention is preferably selected from viscose rayon, cuprammonium rayon and pulp, and either long fiber or short fiber can be used. The amine salt used in the present invention is highly safe even when it comes into contact with a human body, for example, a hand or skin when the nonwoven fabric according to the present invention is used as a cleaning material for a wet tissue or a wet towel for an object or a person. It is selected from primary amine, secondary amine and tertiary amine.

More specifically, the primary amine is lysine hydrochloride, the secondary amine is alkyldiaminoethylglycine hydrochloride, chlorhexidine hydrochloride, chlorhexidine gluconate, and the tertiary amine is cetylpyridinium chloride, benzethonium chloride, benzalcochloride. It is preferable to be selected from the group consisting of aluminum, distearyldimethylammonium chloride, stearyldimethylbenzylammonium chloride, stearyltrimethylammonium chloride, diphenhydramine hydrochloride, pyridoxine hydrochloride, alkylisoquinolinium bromide, domiphen bromide and the like.

[0009] As a method for adding the cleaning material such as wet tissue or wet towel in the step of impregnating the non-woven fabric with various aqueous solutions, that is, an aqueous solution (1 to 4 times the weight of the non-woven fabric) It is preferable to dissolve one or more of the above amine salts and to impregnate the nonwoven fabric with the aqueous solution thereof. When using this method, it goes without saying that extra steps such as bleaching and washing are not required.

The amount of the amine salt added is 0.015% (wt%) or more, preferably 0.1% to the weight of the nonwoven fabric.
It may be 05% (wt%) or more. The upper limit of the added amount is
It can be arbitrarily determined from the viewpoint of safety and cost of the amine salt to be added.

[0011]

[Embodiment] The evaluation method was carried out using a high temperature dryer at 80 ° C.
The sample left for one day was left at room temperature for 1 hour, then opened and taken out, and compared with that before the high temperature standing test. When 5 panelists made a visual judgment, and when 3 or more people did not change their color, it was judged that they were not colored.

[0012]

EXAMPLE 1, COMPARATIVE EXAMPLE 1 The composition of the aqueous solution was as follows (hereinafter, all% means% by weight) Cetylpyridinium chloride 0.05% Ion-exchanged water 99.95% This aqueous solution was Rayon yarn (75 denier yarn manufactured from viscose rayon fiber, manufactured by Asahi Kasei Kogyo Co., Ltd.) was impregnated with 8 times the yarn weight (cetylpyridinium chloride 0.15% of the yarn weight). Example 1). The rayon yarn impregnated with this aqueous solution was put on a commercially available polybag (made of polyethylene, with a thickness of 0.0
(3 mm), heat-sealed, and allowed to stand in a thermostatic dryer at 80 ° C. for 2 days, but no coloring occurred.

On the other hand, rayon yarn is impregnated only with ion-exchanged water without cetylpyridinium chloride, placed in a commercially available plastic bag (made of polyethylene and having a thickness of 0.03 mm), heat-sealed, and a high temperature dryer at 80 ° C. What was left for 2 days was colored yellow (Comparative Example 1).

[0014]

Example 2 and Comparative Example 2 A non-woven fabric prepared by using the same aqueous solution as in Example 1 from rayon fibers made of copper-ammonia, (Benlyze, a trademark of Asahi Kasei Kogyo Co., Ltd.) was added to the non-woven fabric in an amount 3 times the weight of the non-woven fabric (cetylpyridinium chloride, 0.
15%) to produce an aluminum-sealed wet tissue (Example 1).

The obtained product was left in a constant temperature oven at 80 ° C. for 2 days, but the product was not colored. On the other hand, the product (Comparative Example 2) obtained by impregnating the non-woven fabric with ion-exchanged water without cetylpyridinium chloride was colored yellow.

[0016]

Example 3, Comparative Example 3 The composition of the aqueous solution was as follows. Chlorhexidine gluconate 0.02% Ion-exchanged water 99.98% This aqueous solution was added to the non-woven fabric used in Example 2, Benlyze in an amount of 3 times the non-woven fabric weight (chlorhexidine gluconate was 0.06% to the non-woven fabric weight. ) An impregnated, aluminum-sealed wet tissue was produced (Example 3).

The product obtained was left in a thermostatic oven at 80 ° C. for 2 days, but the product was not colored. On the other hand, the product obtained by impregnating the non-woven fabric with ion-exchanged water without chlorhexidine gluconate was colored yellow.

[0018]

Example 4, Comparative Example 4 The composition of the aqueous solution was as follows. Alkyldiaminoethylglycine hydrochloride 0.05% Ion-exchanged water 99.95% This aqueous solution is 3 times the weight of kraft pulp that has not been exposed to hardwood (0.15% of alkyldiaminoethylglycine hydrochloride based on the weight of pulp). It was impregnated (Example 4).
The kraft pulp impregnated with this aqueous solution was placed in a commercially available polybag (made of polyethylene and having a thickness of 0.03 mm) to prevent water evaporation, heat-sealed, and left in a thermostatic dryer at 80 ° C. for 2 days. However, it was not colored.

On the other hand, kraft pulp was impregnated only with ion-exchanged water from which alkyldiaminoethylglycine hydrochloride had been removed (Comparative Example 4), placed in a commercially available plastic bag (made of polyethylene and having a thickness of 0.03 mm), and heat-sealed. After being left in a high temperature dryer at 80 ° C. for 2 days, it was colored yellow.

[0020]

Comparative Example 5 The composition of the aqueous solution was as follows. Chlorhexidine gluconate 0.004% Ion-exchanged water 99.996% This aqueous solution was added to the non-woven fabric and benrise used in Example 2 in an amount three times the weight of the non-woven fabric (chlorhexidine gluconate was 0.012% based on the weight of the non-woven fabric). 3.) Impregnated to produce an aluminum sealed wet tissue.

When the obtained product was allowed to stand in a constant temperature dryer at 80 ° C. for 2 days, the product was colored yellow, and this addition amount had no effect.

[0022]

INDUSTRIAL APPLICABILITY The non-woven fabric of the present invention is longer than the conventional non-woven fabric containing cellulosic fibers even after being left in the air for a long time, and particularly when exposed to a high temperature in a wet state for a long time. A non-woven fabric containing a cellulosic fiber that is difficult to be colored and modified. INDUSTRIAL APPLICABILITY The nonwoven fabric of the present invention is useful for applications such as a cleaning cloth, wet tissue and wet towel.

Claims (1)

[Claims] 1. A non-woven fabric containing cellulosic fibers, wherein one or more amine salts are contained in an amount of 0.0
A non-woven fabric containing 15% by weight or more.