JPS59903Y2 - Physiological absorption material - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a physiologically absorbing member that has a thin overall thickness and can be flushed into a flush toilet.

Recently, a polyvinyl alcohol film that is insoluble in hot water near the human body temperature and menstrual blood, but soluble or dispersible in water at a temperature lower than that, has been added under a layer of a required number of water-absorbing papers or a cotton-like pulp layer. Vacuum cotton, which is made by stacking layers (so-called leak-proof membranes) and wrapping the entire layer with non-woven fabric, has become popular.

However, in order to completely absorb menstrual blood and prevent leakage, it is necessary to make the absorbent layer thicker than a certain level, which means that the entire absorbent cotton is bulky, and when used, it cannot be worn. It has a big feel and is not necessarily comfortable to use.

The present invention solves these conventional problems and has a structural unit in which these are stacked in this order.

In the present invention, a polymer layer C that absorbs a large amount of menstrual blood and exhibits high swelling property is formed between the water-soluble polyvinyl alcohol film B and the leak-proof film mainly made of polyvinyl alcohol.
One of the important points is that the thickness of the menstrual blood absorbing layer A can be made significantly thinner than before, and there is no problem such as menstrual blood leakage. As a result, the overall design can be made more compact and the usability can be significantly improved.

Note that a configuration in which a highly swellable powder and a crushed short fiber aggregate are mixed to form a constant thickness, and both sides of the mixture are covered with thin paper to form a menstrual blood absorption layer, is known from Japanese Patent Publication No. 39-28940. In the present invention, even if the polymer layer C, which absorbs a large amount of menstrual blood and exhibits high swelling properties, is interspersed or interposed between the menstrual blood absorbing layers A, the menstrual blood that permeates from the upper part of the absorbent layer will not be absorbed. Blood absorbs a large amount of menstrual blood and is absorbed by high molecular weight C, which exhibits high swelling properties, but it is not retained or stored there, and further permeates into the lower part of the body through the absorbent layer that comes into contact with it. In the end, the menstrual blood absorbing layer A must be made quite thick, otherwise there is a risk of leakage, and compactness cannot be expected to be that great.

Next, the structure of the physiologically absorbing member of the present invention will be explained in order.

As the menstrual blood absorbing layer A, water-dispersible paper called water-absorbing paper with or without crepe, cotton-like crushed pulp, or a combination thereof is suitable.

The thickness of this menstrual blood absorbing layer A can be made 2/3 or less, or 1/2 or less of that of conventional products.

Water-soluble polyvinyl alcohol film B is a water-soluble polyvinyl alcohol film that dissolves in menstrual blood.

The film must have a composition with an average degree of polymerization of about 800 to 1,800, an average degree of saponification of about 80 to 95 (particularly around 88) mol %, and must not be subjected to heat treatment that would impair water solubility.

Water-soluble polyvinyl alcohol film B dissolves in or absorbs and passes menstrual blood exuding from menstrual blood absorption layer A during use, absorbs a large amount of menstrual blood, and has high swelling properties. It plays the role of being absorbed by the polymer layer C shown.

Next, the polymer used for the polymer layer C, which absorbs a large amount of menstrual blood and exhibits high swelling properties, absorbs a much larger amount of menstrual blood than the crepe paper, pulp waste, etc. used as conventional absorbent materials. It absorbs blood and swells.Specifically, carboxymethyl cellulose soda salt is partially replaced with calcium salt.Cross-linked starch.Copolymerized and modified with ethylenically unsaturated mono- or dicarboxylic acids or their salts. A crosslinked polyvinyl alcohol starch-polyacrylonitrile graft copolymer or a saponified product thereof, obtained by reacting polyvinyl alcohol with phosphoric acid in urea.

However, without being limited to the examples listed above, any material can be used as long as it absorbs a large amount of menstrual blood and exhibits high swelling properties.

These may be used in the form of particles, fibers, films, tapes, etc.

Highly swellable refers to scales that swell by absorbing more than ten times their own weight of water and about ten times more than their own weight of blood.

Those listed above have water swelling properties several tens to hundreds of times higher (for example, 300 times) and blood swelling properties several tens of times higher (for example, about 70 times).

If the polymer layer C, which absorbs a large amount of menstrual blood and exhibits high swelling properties, is in the form of particles, the particles are sprinkled on a leak-proof film mainly made of polyvinyl alcohol, which will be described later, and water-soluble polyvinyl A method of placing alcohol film B and then using an embossing roll to emboss and simultaneously perform embossed heat-pressure adhesion to fix the particles, applying adhesive on the leak-proof film mainly made of polyvinyl alcohol. Then, the particles are sprinkled on top of the film to fix the particles, and then a water-soluble polyvinyl alcohol film B is overlapped and partially adhered. Any method can be used, such as overlapping it with the main leak-proof film.

The point is that the particles need only be fixed between the water-soluble polyvinyl alcohol film B and the leak-proof film mainly composed of polyvinyl alcohol.

The same goes for the case of fibers, but in this case, unlike the case of particles, there is less risk of spillage, so the fibers are not necessarily fixed between the water-soluble polyvinyl alcohol film B and the leak-proof film mainly made of polyvinyl alcohol. You don't have to.

In the case of a film or a tape, it is sufficient if it is interposed between the water-soluble polyvinyl alcohol film B and the leak-proof film mainly composed of polyvinyl alcohol.

It is necessary to coat the water-soluble polyvinyl alcohol film B or the leak-proof membrane mainly made of polyvinyl alcohol with the polymer layer C, which absorbs a large amount of menstrual blood and exhibits high swelling properties, in the form of a solution, dispersion, or melt. It is dried and integrated into a layer on a water-soluble polyvinyl alcohol film B or a leak-proof film mainly composed of polyvinyl alcohol, and this is combined with a leak-proof film mainly composed of polyvinyl alcohol or a water-soluble polyvinyl alcohol film B. They may be overlapped.

The thickness of the polymer layer C that absorbs a large amount of menstrual blood and exhibits high swelling properties is as follows: When the polymer layer C that absorbs a large amount of menstrual blood and exhibits high swelling properties is in the form of particles, film, or tape, , several microns to about 100 microns or less are sufficient.

By adopting the polymer layer C that absorbs a large amount of menstrual blood and exhibits high swelling properties, the menstrual blood absorption layer A, which occupies the bulk of the physiologically absorbent material, can be reduced to less than 2/3 of the conventional amount, or The thickness can be reduced to 1/2 or less, or even to about 1/3, and the overall thickness can be significantly reduced.

Similarly, when the polymer layer C, which absorbs a large amount of menstrual blood and exhibits high swelling properties, is fibrous, the overall thickness can be significantly reduced.

Next, the leak-proof membrane mainly composed of polyvinyl alcohol is a leak-proof membrane mainly composed of polyvinyl alcohol, which is known from Japanese Utility Model Publication No. 15554/1983, that is, the average degree of polymerization is 1000 or more, and the average degree of saponification is 89. .5-98.5
(Especially around 97% by mole) It is composed of a polyvinyl alcohol leakproof membrane.

However, the average degree of saponification here refers to the average value when two or more types of polyvinyl alcohols having different degrees of saponification are used together.

If the average degree of polymerization and the average saponification degree are not within the above ranges, the desired leak prevention effect or dispersibility in water cannot be obtained, and the purpose of the present invention cannot be achieved.

It should be noted that the leak-proof membrane mainly composed of polyvinyl alcohol is not only a single film of the above-mentioned specific polyvinyl alcohol, but also contains polyvinyl alcohol and polyethylene glycol, carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose, starch, soluble starch,
The film may be formed from a blend with a water-soluble polymer such as dextrin.

It may also contain plasticizers such as polyhydric alcohols, sugars, surfactants, fillers, and the like.

However, the amount of the water-soluble polymer and other additives for these blends is limited to equal weight or less to the polyvinyl alcohol.

This leak-proof membrane, which is mainly made of polyvinyl alcohol, has moisture permeability and prevents stuffiness, but it also coagulates blood and exhibits leak-proof properties, and is dispersible in large amounts of water. .

The menstrual blood absorbing layer A described above, the water-soluble polyvinyl alcohol film B, the polymer layer C that absorbs a large amount of menstrual blood and exhibits high swelling properties, and the leak-proof film mainly made of polyvinyl alcohol are laminated in this order. The structure is preferably covered with weakly waterproof paper E (water-dispersible paper treated to size) as shown in the drawing, and the entire structure is covered with water-dispersible paper or rayon non-woven fabric as shown in the drawing. It can be made into a product by packaging it with F.

The product obtained in this way has significantly improved menstrual blood absorption and retention ability due to the presence of the polymer layer C that absorbs a large amount of menstrual blood and exhibits high swelling properties, so the overall thickness is significantly thinner than conventional products. ing.

In addition, the menstrual blood absorbing layer A, the water-soluble polyvinyl alcohol film B, the polymer layer C that absorbs a large amount of menstrual blood and exhibits high swelling properties, and the leak-proof membrane mainly made of polyvinyl alcohol are all resistant to large amounts of water. Since it can be dissolved or dispersed, it can be flushed directly into the flush toilet, which is extremely advantageous in terms of use.

[Brief explanation of the drawing]

The figure is a sectional view illustrating the physiologically absorbing member of the present invention. A: Menstrual blood absorption layer, B: Layer that dissolves in menstrual blood or absorbs and allows menstrual blood to pass through, C: Highly swellable layer, D: ...Leakproof membrane mainly made of polyvinyl alcohol, E...Weakly waterproof paper, F...
・Non-woven fabric.

Claims (1)

[Scope of utility model registration request] 1. Menstrual blood absorption layer A, water-soluble polyvinyl alcohol film B, polymer layer C that absorbs a large amount of menstrual blood and exhibits high swelling properties
A physiologically absorbent member having a structural unit in which leak-proof membranes mainly composed of polyvinyl alcohol and polyvinyl alcohol are laminated in this order. 2. The physiological absorbing member according to claim 1, wherein the menstrual blood absorbing layer A is a layer made by laminating a required number of absorbent papers or a layer combining this with cotton-like crushed pulp. 3. The physiologically absorbing member according to claim 1, wherein the water-soluble polyvinyl alcohol film B is a water-soluble polyvinyl alcohol film having an average degree of polymerization of 800 to 1800 and an average degree of saponification of 80 to 95 mol%. 4. The physiologically absorbing member according to claim 1, wherein the polymer layer C, which absorbs a large amount of menstrual blood and exhibits high swelling properties, is in the form of particles. 5. The physiologically absorbent member according to claim 1, wherein the polymer layer C, which absorbs a large amount of menstrual blood and exhibits high swelling properties, has a fibrous form. 6. The physiologically absorbing member according to claim 1, wherein the polymer layer C, which absorbs a large amount of menstrual blood and exhibits high swelling properties, is in the form of a film. 7. The leak-proof membrane mainly composed of polyvinyl alcohol has an average degree of polymerization of 1000 or more. 2. An average saponification degree of 89.5 to 98.
The physiologically absorbent member according to claim 1, which is a leak-proof membrane mainly composed of 5 mol% polyvinyl alcohol. 8. The physiologically absorbent member according to claim 1, which is a registered utility model, and has a structure in which the polymer layer C, which absorbs a large amount of menstrual blood and exhibits high swelling properties, is fixed to a leak-proof membrane mainly made of polyvinyl alcohol. . 9. A water-soluble polyvinyl alcohol film B and a leak-proof membrane mainly made of polyvinyl alcohol are partially bonded by heat and pressure with a polymer layer C interposed therebetween, which absorbs a large amount of menstrual blood and exhibits high swelling properties. 2. A physiologically absorbing member according to claim 1, which is characterized in that: 10. The water-soluble polyvinyl alcohol film B and the leak-proof membrane mainly composed of polyvinyl alcohol are partially adhered with an adhesive with a polymer layer C that absorbs a large amount of menstrual blood and exhibits high swelling property interposed therebetween. 2. A physiologically absorbing member according to claim 1, which is a utility model.