JPH01120234A - Excrement treating sheet for pet - Google Patents

Abstract

PURPOSE:To obtain the title excrement treating sheet absorbing water and an offensive smell of excrement of pet and reducing an unpleasant feeling of excrement treating operation, by sealing a water absorbing high polymer com plex and a deodorant between two sheets. CONSTITUTION:A water absorbing high polymer complex obtained by impregnating or coating a fibrous substrate or spongy substrate with an ethylenic unsaturated monomer as an aqueous solution and polymerizing and a deodorant (e.g. active carbon) are sealed between a heat-sealable water-permeable sheet and a water-impermeable sheet (e.g. air cup processed sheet) to give the aimed excrement treating sheet preventing pollution and an offensive smell on a floor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Background of the Invention] Technical Field The present invention relates to an excrement disposal sheet. More specifically, the present invention relates to an excrement disposal sheet that absorbs moisture and odor of pet excrement and reduces discomfort during excrement disposal work.

BACKGROUND ART When keeping pets such as dogs and cats, especially when keeping pets indoors, how to dispose of their excrement is often a big problem. That is, excrement not only contaminates the floor but also causes unpleasant odors. Conventionally, therefore, floor contamination and odors have been suppressed by preparing sand, paper, or sheets for excrement disposal and adsorbing or absorbing excreta. However, it has been reported that cat litter is easily scattered around, and conventional sheets for disposing of excrement are not necessarily satisfactory.

By the way, as a sheet for excrement treatment, (a) a powdered water-absorbing polymer is used as an absorbent for excrement such as urine, and this is spread in a thin layer on a supporting substrate such as paper or nonwoven fabric. (b) The dispersed powdered polymer is fixed on a supporting substrate with a glue, or (c) The water-absorbing polymer powder is dispersed between two substrates such as pulp paper, and then embossing is performed. The applied material constitutes the water absorption part, and furthermore,
Water-permeable base material on one side, water-impermeable sheet on the other side,
Mainly known are bag-like products made by laminating and heat-sealing thin layers of polyolefin films. however,
These excrement disposal sheets tend to have the following various problems.

(1) In the sheet (a) in which powdered water-absorbing polymer is sprinkled on the base material, the water-absorbing polymer easily separates from the supporting base during sheet transportation and handling, and the water-absorbing polymer is unevenly distributed in the corners of the sheet. There are times when it becomes.

(2) When a water-absorbing polymer is immobilized on a base material using a glue (b), the absorption performance of excrement (urine) may be reduced.

(3) In the product (c) in which a powdered water-absorbing polymer is fixed on a base material by embossing, the pressure bonding part and the water-absorbing polymer are not fixed to the sheet because the press processing is done in a certain pattern. Since there is a non-crimped part,
When the sheet is cut into a certain shape, the water-absorbing polymer tends to fall off from the sheet.

(4) Furthermore, the processed sheets of (b) and (c) have complicated sheet manufacturing processes, tend to be expensive to manufacture, and also tend to have problems such as variations in quality.

Furthermore, the following two problems are common to the treated sheets of (a) to (c) above.

(5) Dog, cat, etc. excrement has a much stronger odor than human excrement. Particularly when they are kept indoors, bad odors tend to fill the surrounding area, but conventional treatment sheets have poor odor-absorbing ability.

(8) The surface sheet is damaged due to sanding, scratching, and jabbing, which are the habits of dogs and cats, and the water-absorbing polymer inside is separated from the sheet and scattered around, resulting in an unsanitary condition. Something happened.

[Summary of the invention]

Abstract: Instead of using a powdered superabsorbent polymer as a pet excrement treatment sheet, the present inventors developed a superabsorbent polymer composite in which a superabsorbent polymer is attached to a fibrous substrate or a sponge-like substrate. This book was based on the discovery that the above-mentioned problems could be largely solved by covering one side of the deodorant with a water-impermeable sheet, preferably an air-cup treated sheet. The invention was completed.

That is, the pet excrement disposal sheet according to the present invention has a water-absorbing polymer composite and a deodorizer sealed between two heat-sealable sheets, one of which is water permeable and the other is water impermeable. This water-absorbing polymer composite is obtained by impregnating or applying the ethylenically unsaturated monomer that is to form the water-absorbing polymer to a fibrous substrate or sponge-like substrate as an aqueous solution, and polymerizing it. It is characterized by certain things.

Effects The pet excrement disposal sheet according to the present invention has the water-absorbing polymer securely fixed to the polymer support base material, so that
There is no uneven distribution of water-absorbing polymer before use, and during use,
There is no longer any separation of the water-absorbing polymer from the support base material due to movement of the pet after use. Furthermore, by adding a deodorizing agent, preferably activated carbon, it is possible to reduce the odor of pet excrement, which has a stronger odor than that of humans.

In addition, if an air cup processed sheet is used as the water-impermeable sheet, you will not feel the warm or cold sensation of excrement on your fingers, so you can reduce the feeling of uncleanness when disposing of the sheet after excretion. .

[Detailed description of the invention]

Fibrous Substrate or Sponge-like Substrate The fibrous substrate to which the water-absorbing polymer is attached and held is specifically formed by loosely forming fibers, such as a pad, carded or air-laid web, tissue paper, or cotton gauze. It is made of soft cloth, knitted fabric, or non-woven fabric.

A "formed" fibrous substrate is defined as a fibrous substrate that has already been formed into a web and that is used to incorporate the fibrous substrate into an article.
This means that there is no need for further web forming operations, although cutting, joining, shaping, etc. may be required.

It is generally preferred to use absorbent fibers, such as wood bulb, rayon, cotton, other cellulosic fibers, and/or polyester fibers as the main component in the fibrous substrate. However, other types of fibers, such as polyethylene, polypropylene, polystyrene, polyamide, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polyurea, polyurethane, polyfluoroethylene The molded fibrous substrate may include fibers such as polycyanide, vinylidene polycyanide, and the like.

The spongy substrate used in the present invention is a molecular foam such as polyvinyl acetal sponge, rubber sponge, polyethylene foam, polypropylene foam, urethane foam, etc., and has a continuous network porous structure. Any item is fine.

The main role of these fibrous substrates or sponge-like substrates is to retain the adhesion of water-absorbing polymers, but when this substrate is made of water-absorbing fibers as described above, they also function as water-retaining materials in the same way as water-absorbing polymers. also fulfill.

Water-absorbing polymer composite The water-absorbing polymer composite of the present invention is obtained by impregnating a fibrous substrate or a sponge-like substrate with an ethylenically unsaturated monomer to form a water-absorbing polymer as an aqueous solution and polymerizing it. It is something.

As the water-soluble ethylenically unsaturated material to be impregnated or applied to a fibrous substrate or a sponge-like substrate, any material may be used as long as it can be converted into a water-absorbing polymer and provides good water-absorbing performance after polymerization and drying. .

Water-soluble monomers that provide such performance include carboxylic acids or (and) salts thereof, phosphoric acids or (and) as functional groups.
and) salts thereof, water-soluble ethylenically unsaturated monomers having groups derived from sulfonic acids or (and) salts thereof. Specific examples include (meth)acrylic acid or a salt thereof, vinylsulfonic acid or a salt thereof, vinylphosphonic acid or a salt thereof, and the like. Among these, (meth)acrylic acid or a salt thereof is particularly preferred. The resulting polymer may be a homopolymer or copolymer of these monomers, or a graft polymer to starch or cellulose.

Furthermore, it is also possible to add crosslinking agents and additives to these monomers to improve absorption performance. As the crosslinking agent, water-soluble polyfunctional ethylenically unsaturated monomers such as methylene bisacrylamide, ethylene glycol di(meth)acrylate, and polyethylene fluoride di(meth)acrylate, ethylene glycol diglycidyl ether,
Polyglycidyl ethers such as polyethylene glycol diglycidyl ether, polyols such as glycerin and pentaerythritol, and polyamines such as ethylenediamine, which have two or more functional groups that can react with functional groups such as carboxylic acid, phosphoric acid, and sulfonic acid. Water-soluble compounds can be suitably used.

Application of such aqueous solutions of monomers to fibrous or sponge-like substrates may be accomplished by any convenient means or manner, as long as the monomers remain uniformly dispersed and polymerized on the fibrous substrate. be able to. One typical means for this purpose is to impregnate the fibrous substrate or the like with an aqueous monomer solution or to spray the monomer aqueous solution onto the fibrous substrate or the like.

Note that the monomer aqueous solution may contain a small amount of a water-soluble 6-solvent dissolved therein, if desired.

Further, the step of polymerizing the 7-mer particles uniformly dispersed on the fibrous substrate or the spongy substrate may be optional. A typical such method is through the action of a water-soluble radical polymerization initiator, specifically, adding the radical polymerization initiator to an aqueous monomer solution and allowing it to decompose on the fibrous substrate. Alternatively, the radical polymerization initiator can be applied as a solution separate from the monomer evenly by spraying onto the fibrous substrate after the monomer aqueous solution has been applied, and the radical polymerization initiator can be decomposed on the fibrous substrate. is applied as a separate solution to the fibrous substrate, and the aqueous solution of Hemotsuma is sprayed thereon.
It is applied uniformly by coating or the like. Another means of initiating polymerization is irradiation with high energy radiation.

The water-absorbing polymer composite thus obtained is usually dried by means such as hot air, microwaves, and infrared rays. If unreacted monomers, etc. remain in the composite, it is preferable to wash the composite with water or warm water prior to drying.

Water-permeable sheet and water-impermeable sheet The water-permeable sheet used in the present invention is, for example, a sufficiently fine nonwoven fabric made of a thermoplastic material, or a thermoplastic sheet that has been made water-impermeable by electron beam irradiation, etc. There are various kinds of materials, such as those with fine communication holes, and any material may be used as long as it is water permeable and can be heat-sealed. In the pet excrement disposal sheet of the present invention, the water permeable portion is on one side of the sheet and is the side that comes into contact with pet excrement. The other side (back side) may be a water-impermeable film such as a normal polyolefin, but it is preferable to use a sheet made of the same base material with air force and stubble processing (Kokojin sheet).

In the present invention, the superabsorbent polymer composite and a deodorant appropriately sprinkled thereon are sandwiched between these two heat-sealable sheets, and then the above-mentioned two sheets are sandwiched. is heat-sealed to produce the desired pet excrement disposal sheet.

[Experiment example]

Example 1 A 70 mol% neutralized aqueous potassium acrylate solution with a solid content of 63% by weight was prepared. . This solution contained 1% by weight and 500 ppm of N based on the potassium acrylate monomer.
-N' methylenebisacrylamide was dissolved and then this aqueous solution was polymer coated onto a polyester fiber web having a basis weight of 35 g/rrf m 100 g/rr?
The product was sprayed uniformly with 1 streak. The web coated with this monomer was placed in an oven purged with nitrogen for 10 minutes.
The mixture was allowed to stand for a minute to polymerize, and then the composite was dried under reduced pressure at 100° C. to obtain a superabsorbent polymer composite.

Cut this into the desired size (30 x 50 cm), sprinkle activated carbon (2 g/rf) on it, and insert it between a water-permeable polyester nonwoven fabric and an air cup sheet made of water-impermeable polyolefin film. and heat-sealed to produce the desired pet excrement disposal sheet.

(Test 1) Using this sheet (30x'50cm), use physiological saline (
The water absorption amount of 0,996 NaCl (1 water) was determined to be 400 g (physiological saline)/1 sheet.

(Test 2) This sheet was used to absorb approximately 50 cc of cat urine. After absorption, there was almost no bad odor from the sheet.

Applicant's representative: Mr. Sato

Claims (1)

[Claims] 1. A water-absorbing polymer composite and a deodorant are sealed between two heat-sealable sheets, one of which is water permeable and the other is water impermeable; The water-absorbing polymer composite is obtained by impregnating or applying an ethylenically unsaturated monomer to form a water-absorbing polymer onto a fibrous substrate or sponge-like substrate as an aqueous solution, and polymerizing it. Pet excrement disposal sheet. 2. The pet excrement disposal sheet according to claim 1, wherein the water-impermeable heat-sealable sheet is an air cup processed sheet. 3. The pet excrement disposal sheet according to claim 1, wherein the deodorant is activated carbon.