JPH0819571A - Absorbent sanitary article - Google Patents

Abstract

PURPOSE:To enhance the absorbency and the retentivity of humor by laying a layer composed of a copolymer of vinyl acetate-vinyl chloride-methyl methacrylate, and a polymethyl methacrylate on the side where it makes contact with an absorbing layer composed of water-absorbing paper which is disposed in water and/or water-absorbing surface. CONSTITUTION:This absorbent sanitary article is composed of a water- permeable front surface layer 1, a waterproof rear surface layer 2 and an absorbing layer 3. The waterproof rear surface layer 2 is formed of a laminated film composed of a layer 2a formed of a copolymer of vinyl acetate-vinyl chloride- methyl methacrylate, and polymethacrylate, and a film layer 2b made of polyvinyl alcohol and laminated with the layer 2a, the layer 2a being set on the side where it makes contact with the absorbing layer 3. The water-permeable outer surface layer 1 and the waterproof rear surface layer 2 embraces the absorbing layer 3 therebetween, and are integrally incorporated at their ends 4, 4' with each other. Further, the layer 2a has a weight ratio between the copolymer of vinyl acetate-vinyl chloride-methyl methacrylate, and polymethyl methacrylate, which is preferably set in a range of 50:50 to 90:10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent hygiene article which can be discarded in a flush toilet or the like.

[0002]

2. Description of the Related Art Absorbent hygiene products such as sanitary napkins, disposable diapers, and incontinence pads quickly absorb body fluids such as blood and urine and water such as feces, and retain them for a long time without leaking. Required. Therefore, these absorbent hygiene products generally have a basic structure of a water-permeable surface layer, an absorbent layer, and a waterproof back surface layer. And
In order to maintain waterproofness, hydrophobic synthetic resins and fibers such as polyester, polypropylene and polyethylene are partially used as the waterproof back surface layer. When such hydrophobic synthetic resins and fibers are used, However, it was not possible to throw it away in a flush toilet after use, and there was a problem in disposal.

[0003]

The object of the present invention is to have good absorption and retention of body fluids when worn, and to be easily dissolved or dispersed as a whole by water in a flush toilet or the like when discarded. To provide possible absorbent hygiene products.

[0004]

Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the present inventors have found that when absorbent hygiene products have a specific structure as described below, they absorb and absorb body fluids when worn. The present invention has been achieved based on the finding that an absorbent hygiene article that has good retainability and the like, can be discarded in a flush toilet after use, and can be easily disposed of can be obtained. That is, the gist of the present invention is an absorbent hygiene article comprising a water permeable surface layer, an absorbent layer and a waterproof back surface layer, wherein the water permeable surface layer is made of a nonwoven fabric that disperses in water, and the absorbent layer disperses in water. And / or water-absorbent cotton, and the waterproof back layer is a laminated film in which a film made of water-soluble polyvinyl alcohol is laminated with a layer made of vinyl acetate / vinyl chloride / methyl methacrylate copolymer and polymethyl methacrylate. The absorbent hygiene article is characterized in that the layer made of a vinyl acetate / vinyl chloride / methyl methacrylate copolymer and polymethyl methacrylate is disposed on the side in contact with the absorbent layer.

The present invention will be described in detail below with reference to the drawings. 1 and 2 are sectional views showing examples of the absorbent hygiene article of the present invention. 1 and 2, the absorbent hygiene article comprises a water permeable front layer 1, a waterproof back layer 2 and an absorbent layer 3. The waterproof back surface layer 2 is made of a laminated film in which a layer 2a made of a vinyl acetate / vinyl chloride / methyl methacrylate copolymer and polymethylmethacrylate and a film layer 2b made of polyvinyl alcohol are laminated, and vinyl acetate / vinyl chloride / methyl methacrylate is used. The layer 2 a made of the copolymer and polymethylmethacrylate is arranged on the side in contact with the absorption layer 3. The water-permeable front surface layer 1 and the waterproof back surface layer 2 wrap the absorbent layer 3 inside to form the end portions 4, 4'of both layers.
However, the integration method is not limited to this. The size, length, thickness, shape, etc. of the absorbent hygiene article of the present invention can be arbitrarily determined according to the purpose of use.

The water-permeable surface layer 1 is made of a non-woven fabric that can be dispersed in water. For example, a fiber made of polyamide, polyester, polyethylene, polypropylene, rayon, cotton or the like is used as a non-woven fabric with water-soluble polyvinyl alcohol as a binder. To be It is more preferable to use an aliphatic polyester such as polycaprolactone or a biodegradable polymer fiber such as cellulose. The fiber length of these fibers can be arbitrarily determined according to need, but is 10 to 7
It is preferably 0 mm. If it is less than 10 mm, the fibers tend to fall out of the nonwoven fabric and the water resistance tends to decrease.
If it exceeds m, it tends to be difficult to disperse in water.

The water-soluble polyvinyl alcohol used as the binder preferably has a saponification degree of 60 to 98 mol% and is soluble, swelled or dispersed in water at about 40 ° C. or less, and particularly preferably dissolved or dispersed in water at 30 ° C. or less. And is insoluble in hot water of about 35 ° C. or higher. If the degree of saponification is less than 60 mol%, the water solubility decreases,
Organic solvent tends to be required, and saponification degree is 98 mol%
If it exceeds, it tends to be soluble in warm water and insoluble in water at 40 ° C or lower.

The proportion of the water-soluble polyvinyl alcohol used in the water-permeable surface layer can be arbitrarily determined as necessary, but it is preferably 3 to 70% by weight. If it is less than 3% by weight, the effect as a binder is low, and fibers such as polyamide and polyester tend to fall off.
If it exceeds 5% by weight, dissolution is promoted by a small amount of water or water, and the water resistance tends to deteriorate and discomfort tends to occur.

The main purpose of the water-permeable surface layer is to quickly transfer the body fluid to the absorbent layer to reduce the contact between the body fluid and the body, and to hold the absorbent layer together with the waterproof back layer inside. To do. Therefore, if the absorbent layer has a sufficient water-retaining function, it will not be exposed to a large amount of body fluid for a long time while being worn on the body, and the form of the nonwoven fabric and the required function can be maintained. Particularly, when polyvinyl alcohol, which is insoluble in hot water of about 35 ° C. or higher, is used as a binder, it is possible to impart dispersion resistance to a body fluid of relatively high temperature immediately after excretion. After use, it is dispersed by a large amount of water when it is desorbed from the body and dumped in a flush toilet or the like.

The absorbent layer is made of water-absorbent paper and / or water-absorbent cotton dispersed in water, for example, toilet paper or cotton-like pulp. Further, a mixture of these with a super absorbent polymer such as starch-acrylic acid copolymer, carboxymethylated cellulose, carboxymethylated rayon, chitin and chitosan can be used. The amount of these superabsorbent polymers to be mixed in the water-absorbent paper and / or the water-absorbent cotton can be arbitrarily determined as necessary.
It is preferably about 30% by weight. If the blending amount is less than 2% by weight, a large amount of water cannot be absorbed and may flow backward to the water permeable surface layer and the skin, and if it exceeds 30% by weight, the water permeable surface layer and the waterproof back layer due to volume swelling during water absorption. And the adhesive layer thereof may be destroyed. The super absorbent polymer is dispersed between the fibers constituting the absorbent paper and / or the absorbent cotton and is stably supported. With such a structure, body fluid is stably retained in the absorbent layer when worn, and dispersed by a large amount of water in the flush toilet when discarded.

The waterproof back layer is a laminated film in which a water impermeable polyvinyl alcohol film is laminated with a water impermeable vinyl acetate / vinyl chloride / methyl methacrylate copolymer and a polymethyl methacrylate layer. The polyvinyl alcohol used for the waterproof back surface layer preferably has a saponification degree of 70 to 98 mol% and is soluble, swelled or dispersed in water at about 40 ° C. or lower.
When the degree of saponification is less than 70 mol%, it tends to be insoluble in water, and when the degree of saponification exceeds 98 mol%, it becomes soluble in warm water.
It tends to be insoluble in water at 40 ° C or lower.

The copolymer used for the layer laminated on the polyvinyl alcohol film is a copolymer obtained from three components of vinyl acetate, vinyl chloride and methyl methacrylate, and has water resistance. The component ratio of vinyl acetate, vinyl chloride and methyl methacrylate in the copolymer is 1 to
It is preferably 70:15 to 65:15 to 34 (mol%). A more preferable component ratio is 6 to 10:
57-62: 27-32 (mol%). 1-70:
Outside the range of 15 to 65:15 to 34 (mol%), the adhesiveness with polyvinyl alcohol is impaired, and the laminated film tends to be brittle and the waterproof property tends to be lowered.

The polymethylmethacrylate used for the layer laminated on the polyvinyl alcohol film is a bulk polymerization, a liquid polymerization, an emulsion polymerization, a granular polymerization, etc., using methyl methacrylate as a monomer and a peroxide catalyst such as benzoyl peroxide. Manufactured by. The proportions of vinyl acetate / vinyl chloride / methyl methacrylate copolymer and polymethyl methacrylate are 50 to 90% by weight and 10 to 10%, respectively.
It is preferably 50% by weight. A more desirable ratio is 60 to 75% by weight and 25 to 40% by weight, respectively. When the amount of polymethylmethacrylate is less than 10% by weight, the water resistance of the laminated layer is not increased, and when the amount of polymethylmethacrylate is more than 50% by weight, the laminated layer becomes tough and disintegrates in water or Dispersibility may be impaired. Moreover, it is preferable to use a polymethyl methacrylate having a polymerization degree of 100 to 2000 in order to optimize the surface hardness and flexibility of the laminated layers.

The polyvinyl alcohol used in the waterproof back surface layer may contain a gelling accelerator of polyvinyl alcohol in order to enhance the film strength or the coating strength of the laminated surface. The polyvinyl alcohol gelation accelerator refers to salts having a coagulating effect on polyvinyl alcohol, substances capable of chemically binding polyvinyl alcohol and diol type, and the like. Salts preferably used in the present invention include sodium sulfate, magnesium sulfate,
Examples thereof include sulfates such as aluminum sulfate, ammonium sulfate and potassium sulfate, nitrates such as sodium nitrate, ammonium nitrate and aluminum nitrate, phosphates such as sodium phosphate and chromates such as potassium chromate.
Further, as the substance capable of chemically bonding with polyvinyl alcohol, boric acid, borate, borax, copper, aluminum,
Examples thereof include compounds such as titanium, zirconium, tin, vanadium.

The proportion of these gelling promoters mixed in polyvinyl alcohol varies depending on the gelling ability of each gelling promoter, but is 30 mol% or less, particularly 20 mol% with respect to the vinyl alcohol unit of polyvinyl alcohol. Those having a mol% or less are preferable. When the concentration of the gelling agent exceeds 30 mol%, the water solubility of the film cannot be sufficiently obtained,
It is difficult to obtain the desired film performance.

In order to improve the flexibility of the polyvinyl alcohol film, a plasticizer may be added to the extent that the film performance is not impaired. Examples of the plasticizer include ethylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol,
Hexamethylene glycol, propylene glycol, glycerin, 2,3-butanediol, 1,3-butanediol, diethylene glycol, triethylene glycol, dibutyl phthalate, dioctyl phthalate and the like can be mentioned.

The polyvinyl alcohol film for the waterproof back layer can be produced by a known method. For example, polyvinyl alcohol is dissolved in water at an appropriate temperature,
After swelling or dispersing, it can be manufactured through the steps of defoaming, casting and drying. A heat treatment step may be added to increase the film strength.

Although the thickness of the polyvinyl alcohol film used for the waterproof back layer is not particularly limited, it is usually 25-2.
It is preferably 50 μm. If the thickness is less than 25 μm, the film strength is low, and therefore the film may be damaged when the water absorbing layer contains a large amount of water or when it is subjected to abrasion due to vigorous movement or mechanical force such as pulling.
If it exceeds 50 μm, it tends to take a long time to dissolve or disperse when it is discarded in a flush toilet.
There is a tendency to increase inconvenience in use, such as exceeding the practical thickness as a sanitary product and impairing flexibility.

The waterproof backing layer is prepared by a known method using a solution of a copolymer of three components of vinyl acetate / vinyl chloride / methyl methacrylate and polymethyl methacrylate on one side of the polyvinyl alcohol film obtained under the above conditions. It is obtained by laminating with. For example, it can be obtained by mixing a solution in which a copolymer is dissolved and a solution in which polymethylmethacrylate is dissolved, coating the resulting solution on a polyvinyl alcohol film, and removing the solvent. As the solvent for the copolymer and polymethylmethacrylate, methanol, ethanol, methyl acetate, ethyl acetate, butyl acetate, amyl acetate, benzene, toluene, acetone,
Methyl ethyl ketone, trichloroethylene, dichloromethane and the like can be mentioned.

The thickness of the layer comprising the copolymer and polymethylmethacrylate is preferably about 0.05 to 20 .mu.m, below which sufficient water impermeability cannot be obtained, and above this range. Then adversely affects the solubility and dispersibility of the film as a whole in water.

Further, since the polyvinyl alcohol film layer of the waterproof back surface layer is colored, a coloring agent may be added to the extent that the performance and strength of the film are not impaired.
In addition, the surface opposite to the surface on which the layer consisting of the copolymer and polymethylmethacrylate is laminated is given temporary water resistance to prevent welding to the toilet bowl, etc., and even when flushed to the sewage or sewage treatment tank. Since it is made to flow down without being welded, a colorant may be laminated by a method such as coating so as not to impair the performance and strength of the film. Examples of the colorant include Benzopurpurine 4BX
KX), Nippon Orange GC (Nippon Orange G)
C), chrysophenine NS (chrysophenine NS), Direct Sky Blue 5B,
Nippon Fast Violet BB (Nippon Fast V
iolet BB), Direct Brown M (Direct Brown)
M), Nippon Deep Black Extra (Nippon D
eep Black Extra), Sulfur Indigo R (Sulphu
r Indigo R), Sulfur Black BC (Sulfur Bl)
ack BC), Mikethrene Blue RS (Mikethrene Blue)
RS), Naphtol AS, Fast Scarlet G Base, Rocceline NS, Acid Brilliant Scarlet 3R,
Chrome Green F (Chrome Green F), Chrome Black AC (Chrome Black AC), Rhodamin B (Rhodamin
e B), Celliton First Pink F3B (Celliton F
ast Pink F3B), Ceriton First Blue FFR
(Celliton Fast Blue FFR) and the like.

In order to further enhance the water resistance of the waterproof back surface layer, a water repellent agent may be further applied onto the layer composed of the above copolymer and polymethylmethacrylate. Typical examples of the water repellent include paraffin, aluminum stearate, zirconium stearate, a silicone resin or methylhydropolysiloxane as a main component, and a reactive silicone compound which is reticulated by a catalyst or a pyridinium salt type cationic interface. Activator, methylol stearamide, a long-chain saturated hydrocarbon compound having reactivity such as octadecyl ethylene urea, further, a compound containing acrylic acid polyfluoroalkyl ester having a perfluoroalkyl group as a side chain as a constituent unit, Examples thereof include compounds containing fluorine in the main chain. In particular, a water repellent comprising a compound having a perfluoroalkyl group having a property of repelling water and oil is preferably used, but other water repellents may be used depending on the use. Further, there is no limitation on the coating amount of the water repellent and the heat treatment method after coating. These water repellents are those in which a compound having water repellency is emulsified in water using a small amount of a surfactant,
Alternatively, those dispersed / dissolved in a solvent may be mentioned, and they may be applied by a known method, dried and heat-treated depending on the application.

In order to enhance the adhesiveness between the polyvinyl alcohol film layer and the layer of the waterproof backside copolymer and polymethylmethacrylate, a layer between the copolymer and polymethylmethacrylate layer and the polyvinylalcohol film layer is formed. Alternatively, a water-soluble polymer or the like may be laminated as an adhesive. Examples of the water-soluble polymer include polyethylene oxide, starch, hydroxyethyl cellulose, carboxymethyl cellulose, methyl cellulose, pullulan, xanthan gum, phthalic acid / ethylene glycol copolymer and the like. Examples of materials other than the water-soluble polymer include alginic acid.

The water-permeable front surface layer, the absorbent layer and the waterproof back surface layer are formed into a predetermined shape to obtain an absorbent hygiene article.
That is, the absorbent layer is wrapped inside the water-permeable front surface layer and the waterproof back surface layer to integrate the ends of the water-permeable front surface layer and the waterproof back surface layer. Examples of the method of integration include adhesion with an adhesive, fusion by heating, and adhesion with an adhesive tape or the like. At this time, the waterproof back surface layer on the side in contact with the absorbent layer is arranged so as to be a layer of vinyl acetate / vinyl chloride / methyl methacrylate copolymer. Further, in order to enhance the adhesiveness when the end portions of the water-permeable front surface layer and the waterproof back surface layer are integrated, on the layer composed of the copolymer and polymethylmethacrylate or on the layer composed of the copolymer and polymethylmethacrylate. A water-soluble polymer or the like may be laminated as an adhesive on the water repellent layer applied to. As the water-soluble polymer, for example, polyethylene oxide, starch, hydroxyethyl cellulose, carboxymethyl cellulose, methyl cellulose, pullulan, xanthan gum, phthalic acid /
Examples thereof include ethylene glycol copolymers. Examples of materials other than the water-soluble polymer include alginic acid.

With such a structure, an absorbent hygiene article having a function of absorbing and retaining body fluids well when worn and having an entire body easily dispersed by water such as a flush toilet at the time of disposal can be obtained.

[0026]

EXAMPLES The present invention will be specifically described below with reference to examples.

Example 1 A. Water-permeable surface layer Rayon fiber (fiber diameter 10 denier, fiber length 40 mm)
50% by weight and 50% by weight of polyethylene fiber (fiber diameter 3 denier, fiber length 40 mm) were uniformly mixed, and 4 g of the obtained fiber was used as a binder of polyvinyl alcohol "U".
P-200 "(manufactured by Unitika Ltd., saponification degree 87-89 mol%, polymerization degree 2000) was made into 10% water-soluble 30 l to make 4.5 g of a water-dispersible non-woven fabric having a basis weight of 7 g / m ² .

B. Absorption layer A weight ratio of a cotton-like pulp having a fiber length of about 3 mm and a highly water-absorbent polymer "Sumikagel SP-510" (manufactured by Sumitomo Chemical Co., Ltd.) made of an acrylic acid / vinyl alcohol copolymer is 10:
The mixture was mixed in No. 1 to obtain absorbent cotton in which the fibers of cotton-like pulp and the superabsorbent polymer were uniformly dispersed. On the other hand, commercially available toilet paper is cut into a width of 11 cm and a length of 20 cm, and the water absorbent cotton and the toilet paper are alternately laminated to obtain 100 g /
It was embossed with a pressure of cm ² to obtain a sheet-shaped absorption layer.

C. Waterproof back layer Water-soluble polyvinyl alcohol "UP-180" (manufactured by Unitika Ltd., saponification degree 87 to 89 mol%, polymerization degree 1850)
20 g was placed in a beaker, 113 ml of distilled water was added to swell it, and the mixture was dissolved by vigorously stirring in a water bath at 90 ° C. After removing bubbles in the solution, the solution was cast on a polyethylene terephthalate film, air-dried at room temperature overnight, and peeled to obtain a polyvinyl alcohol film having a thickness of about 80 μm. On the other hand, 3 components of vinyl acetate, vinyl chloride, and methyl methacrylate (component ratio of 8: 62: 3 each)
0) 20% toluene solution of copolymer "MC lacquer"
A 30% toluene solution of polymethylmethacrylate "Acrypet V" (manufactured by Mitsubishi Rayon Co., Ltd.) was mixed with (manufactured by Meisei Chemical Co., Ltd.) at a weight ratio of 60:40, and the resulting mixed solution was the polyvinyl alcohol film. Was roll-coated and dried at 90 ° C. for 5 minutes to obtain a laminated film. The thickness of the layer composed of the laminated copolymer and polymethylmethacrylate was about 7 μm. When a water drop was dropped on each surface of the laminated film, holes were opened from the polyvinyl alcohol layer side, but there was no change from the copolymer layer side.

D. Absorbent hygiene article The water-permeable surface layer, the absorbent layer, and the waterproof back surface layer obtained as described above are arranged so that the absorbent layer and the water-impermeable layer of the waterproof back surface layer are in contact with each other. An end portion with the waterproof back surface layer was adhered with a water-soluble adhesive double-sided tape “# 906” (manufactured by Sumitomo Three M Co., Ltd.) having a width of 5 mm and integrated to produce an absorbent hygiene article.

E. Results of Various Tests 50 ml of artificial urine having the composition shown in Table 1 was dropped on the water permeable surface layer of the absorbent hygiene article and left for 60 minutes, but no water leakage from the waterproof back surface layer was observed. Also, drop 50 g of artificial urine onto the absorbent hygiene article, place a filter paper on the water-permeable surface, and put a weight of the same shape as the absorbent hygiene article 35
After a pressure of g / cm ² was applied and the mixture was allowed to stand for 5 minutes, the amount of liquid exuded on the filter paper was measured. As a result, only 0.9 g was reversely transferred from the absorption layer. At the same time, when the water-permeable surface layer was observed, the morphology of the non-woven fabric was almost maintained. Also in this case, no water leakage was observed from the waterproof back surface layer.

After such a test, these absorbent hygiene products were thrown away in a Japanese style flush toilet bowl, left standing in water for 1 minute and flushed. Furthermore, as a result of observing what has flowed into the sewer pipe from the toilet,
Each layer was dispersed and did not retain its original morphology.

[0033]

[Table 1]

Example 2 A. Water-permeable surface layer Rayon fiber (fiber diameter 10 denier, fiber length 40 mm)
30% by weight and polyethylene fiber (fiber diameter 3 denier, fiber length 40 mm) 50% by weight and polyvinyl alcohol fiber (fiber diameter 10 denier, fiber length 30 mm) "UP-3
0M "(manufactured by Unitika Ltd., saponification degree 60 to 63 mol%, polymerization degree 320) 20 wt% are mixed and dispersed as a binder,
It was fused and integrated by hot pressing at 160 ° C. to obtain a water-dispersible nonwoven fabric having a basis weight of 7 g / m ² .

B. Absorption layer Super absorbent polymer "KI gel 2" consisting of a cotton-like pulp having a fiber length of about 3 mm and an isobutylene / maleic anhydride copolymer
01 K-F2 ”(manufactured by Kuraray Co., Ltd.) in a weight ratio of 10: 1 to uniformly disperse the superabsorbent polymer between pulp fibers, and to prepare an absorption layer in the same manner as in Example 1.

C. Waterproof Back Layer A water-soluble polyvinyl alcohol film was produced in the same manner as in Example 1. On the other hand, 3 components of vinyl acetate / vinyl chloride / methyl methacrylate (component ratio 8: 62: 3 each)
0) 20% toluene solution of copolymer "MC lacquer"
A 30% toluene solution of polymethylmethacrylate "Acrypet V" (manufactured by Mitsubishi Rayon Co., Ltd.) was mixed with (manufactured by Meisei Chemical Co., Ltd.) at a weight ratio of 70:30, and the resulting solution was rolled on the polyvinyl alcohol film. It was applied by coating and dried at 90 ° C for 5 minutes to obtain a laminated film. The thickness of the layer composed of the laminated copolymer and polymethylmethacrylate was about 7 μm. When a water drop was dropped on each surface of the laminated film, holes were opened from the polyvinyl alcohol surface side, but there was no change from the laminated surface side of the copolymer.

D. Absorbent hygiene article An absorbent hygiene article was prepared in the same manner as in Example 1 using the water-permeable surface layer, the absorbent layer and the waterproof back surface layer obtained as described above.

E. Results of Various Tests 50 ml of artificial urine shown in Table 1 was dropped on the water permeable surface layer of the absorbent hygiene article and left for 60 minutes, but no water leakage from the waterproof back surface side was observed. Also, add 50 g of artificial urine to the absorbent hygiene article, put a filter paper on the water-permeable surface, and put a weight of the same shape as the absorbent hygiene article at 35 g / c.
After applying a pressure of m ² for 5 minutes and allowing to stand for 5 minutes, the amount of the liquid leached on the filter paper was measured. As a result, only 0.9 g of the liquid reversely transferred from the absorption layer. At the same time, when the water-permeable surface layer was observed, the morphology of the non-woven fabric was almost maintained. Also in this case, no water leakage was observed from the waterproof back surface layer.

After such a test, these absorbent hygiene articles were thrown away in a style flush toilet, allowed to stand in water for 1 minute and flushed, and they could be treated without clogging the drain. Furthermore, as a result of observing what has flowed into the sewer pipe from the toilet,
Each layer was dispersed and did not retain its original morphology.

Comparative Example 1 A. Water-permeable surface layer In the same manner as in Example 2, a water-dispersible nonwoven fabric having a basis weight of 7 g / m ² was obtained. B. Absorption layer An absorption layer was prepared in the same manner as in Example 2.

C. Waterproof Back Layer A water-soluble polyvinyl alcohol film was produced in the same manner as in Example 1. On the other hand, 3 components of vinyl acetate / vinyl chloride / methyl methacrylate (component ratio 8: 62: 3 each)
0) 20% toluene solution of copolymer "MC lacquer"
(Manufactured by Meisei Chemical Co., Ltd.) was applied onto the polyvinyl alcohol film by roll coating and dried at 90 ° C. for 5 minutes to obtain a laminated film. The thickness of the laminated copolymer layer was about 7 μm. When a water drop was dropped on each surface of the laminated film, holes were opened from the polyvinyl alcohol surface side, but there was no change from the laminated surface side of the copolymer. D. Absorbent hygiene article An absorbent hygiene article was prepared in the same manner as in Example 1 using the water-permeable surface layer, the absorbent layer and the waterproof back surface layer obtained as described above.

E. Results of Various Tests 50 ml of artificial urine shown in Table 1 was dropped on the water permeable surface layer of the absorbent hygiene article and left for 60 minutes, but no water leakage from the waterproof back surface side was observed. Also, add 50 g of artificial urine to the absorbent hygiene article, put a filter paper on the water-permeable surface, and put a weight of the same shape as the absorbent hygiene article at 35 g / c.
After applying a pressure of m ² for 5 minutes and allowing to stand for 5 minutes, the amount of the liquid leached on the filter paper was measured. As a result, only 0.9 g of the liquid reversely transferred from the absorption layer. At the same time, when the water-permeable surface layer was observed, the morphology of the non-woven fabric was almost maintained. However, the waterproof back layer was slightly swollen. When the weight was set to 25 g / cm ² , water leakage from the waterproof back layer was not seen. After such a test, these absorbent hygiene products were thrown away in a Western-style flush toilet, left standing in water for 1 minute and flushed, and they could be treated without boring in the drain port. Furthermore, as a result of observing what flowed into the sewer pipe from the toilet bowl, the respective layers were dispersed and did not retain the original form.

Comparative Example 2 A. Water-permeable surface layer In the same manner as in Example 2, a water-dispersible nonwoven fabric having a basis weight of 7 g / m ² was obtained. B. Absorption layer An absorption layer was prepared in the same manner as in Example 2.

C. Waterproof Back Layer A water-soluble polyvinyl alcohol film was produced in the same manner as in Example 1. On the other hand, 3 components of vinyl acetate / vinyl chloride / methyl methacrylate (component ratio 8: 62: 3 each)
0) 20% toluene solution of copolymer "MC lacquer"
A 30% toluene solution of polymethylmethacrylate "Acrypet V" (manufactured by Mitsubishi Rayon Co., Ltd.) was mixed with (manufactured by Meisei Chemical Co., Ltd.) in a weight ratio of 30:60, and the resulting solution was rolled on the polyvinyl alcohol film. It was applied by coating and dried at 90 ° C for 5 minutes to obtain a laminated film. The thickness of the layer composed of the laminated copolymer and polymethylmethacrylate was about 7 μm. When a water drop was dropped on each surface of the laminated film, holes were opened from the polyvinyl alcohol surface side, but there was no change from the laminated surface side of the copolymer. D. Absorbent hygiene article An absorbent hygiene article was prepared in the same manner as in Example 1 using the water-permeable surface layer, the absorbent layer and the waterproof back surface layer obtained as described above.

E. Results of Various Tests 50 ml of artificial urine shown in Table 1 was dropped on the water permeable surface layer of the absorbent hygiene article and left for 60 minutes, but no water leakage from the waterproof back surface side was observed. Also, add 50 g of artificial urine to the absorbent hygiene article, put a filter paper on the water-permeable surface, and put a weight of the same shape as the absorbent hygiene article at 35 g / c.
After applying a pressure of m ² for 5 minutes and allowing to stand for 5 minutes, the amount of the liquid leached on the filter paper was measured. As a result, only 0.9 g of the liquid reversely transferred from the absorption layer. At the same time, when the water-permeable surface layer was observed, the morphology of the non-woven fabric was almost maintained. Also in this case, no water leakage was observed from the waterproof back surface layer.

After such a test, these absorbent hygiene products were thrown away in a Western style flush toilet, left to stand in water for 1 minute and flushed, but a single flush did not flow and it took several treatments. Furthermore, as a result of observing what has flowed into the sewer pipe or the like from the toilet bowl, it was found that only the waterproof back surface layer remained as a film without being dispersed.

From Example 1, Example 2, Comparative Example 1 and Comparative Example 2, the absorbent hygiene article of the present invention has functions required to absorb and retain body fluid when worn, and is used as a flush toilet when discarded. It is clear that the whole is easily dissolved or dispersed by water.

[0048]

EFFECT OF THE INVENTION The absorbent hygiene article of the present invention has good absorbability and retention of body fluid when worn, and has no leakage.
The whole is easily dissolved or dispersed by water and can be disposed of in a flush toilet. Therefore, when it is treated as a waste after use, it is possible to solve the problem of bagging, contamination, and odor.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of an absorbent hygiene article of the present invention.

FIG. 2 is a cross-sectional view showing another example of the absorbent hygiene article of the present invention.

[Explanation of symbols]

1 Water Permeable Surface Layer 2 Waterproof Back Layer 2a Layer Made of Vinyl Acetate / Vinyl Chloride Methyl Methacrylate Copolymer and Polymethyl Methacrylate 2b Film Layer Made of Polyvinyl Alcohol 3 Absorption Layer 4, 4'Ends

Claims (2)

[Claims] 1. An absorbent hygiene article comprising a water permeable surface layer, an absorbent layer and a waterproof back surface layer, wherein the water permeable surface layer is made of a non-woven fabric dispersed in water, and the absorbent layer is water-absorbent paper and / or dispersed in water. The waterproof back layer is made of water-absorbent cotton, and the waterproof back layer is made of a film made of water-soluble polyvinyl alcohol and a laminated film in which a layer made of vinyl acetate / vinyl chloride / methyl methacrylate copolymer and polymethyl methacrylate is laminated. -Absorptive hygiene article characterized in that a layer made of vinyl chloride / methyl methacrylate copolymer and polymethyl methacrylate is arranged on the side in contact with the absorption layer. 2. The weight ratio (% by weight) of the vinyl acetate / vinyl chloride / methyl methacrylate copolymer to the polymethyl methacrylate is 50:50 to 90:10.
Absorbent hygiene products as described.