JPH0724004A - Water-disintegrable medical supplies - Google Patents

Abstract

PURPOSE:To obtain medical supplies which are stable in use and disintegrable by water when discarded, by using printing faces and a water-disintegrable pulp sheet, a printing face having a specified value of opening ratio by a printing ink containing hydrophobic polymer as a permeable layer of liquid component, a printing face having a specified value of opening ratio by a printing ink containing water-soluble polymer, and a water-disintegrable pulp sheet. CONSTITUTION:As a permeable layer 1 for liquid component, there are used a printing face 6 having an opening ratio of 40-60% by a printing ink containing hydrophobic polymer, a printing face 7 having an opening ratio of 40-60% by a printing ink containing water-soluble polymer, and a water-disintegrable pulp or fibrous sheet 8, and as an absorptive layer 2 water-disintegrable pulp containing highly absorptive polymer 10 or a fibrous sheet 9 is used, as necessary. Also, as a leakage-proof layer 3, a water-disintegrable pulp or fibrous sheet where a water-soluble polymer film is laminated or where a water-soluble polymer is applied impregnated is used. Then, the peripheries of these are adhesively bonded. Further, as a removable paper 13 for a tacky adhesive, a water- disintegrable paper is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has been used as a sanitary material for sanitary tracts, disposable diapers, etc., which cannot be put into and discharged from a flush toilet after absorption of menstrual blood, urination and defecation. In addition to its function, it is stable when it is used, but when it is not needed, it can be put into a flush toilet with the entire absorbent material including release paper, and it can be discharged and released. Related to sanitary materials.

[0002]

2. Description of the Related Art As a basic structure common to sanitary materials such as sanitary belts and disposable diapers, pulp or an absorbent layer containing pulp as a main component is placed on a polyethylene film having a thickness of about 20 microns and polyethylene or Structures have been adopted in which porous sheets of fibers of other polymers are stacked. When the above-mentioned structure is adopted, since it is a non-disintegrating material provided above and below water, even if the intermediate absorbent layer is a water-disintegrating material such as pulp, sanitary materials such as sanitary belts, disposable diapers, etc. As a whole, it is non-disintegrating in water and cannot be put into a flush toilet after being used and discharged. Therefore, under the present circumstances, sanitary materials including menstrual blood, urine, stool, etc. are disposed of together with general household waste, which is becoming a major environmental sanitation problem.

[0003]

As described above, in order to maintain the sensation of the surface in contact with the body, the ability to permeate menstrual blood and urine, and the ability to prevent leakage, a porous material that is non-disintegrating with water as described above. See
However, the disposal of these sanitary materials has become a major social problem. Therefore, it is desired to develop a sanitary material that can replace the existing sanitary materials that have a harmful effect on the environment while maintaining the conventional function and being water-disintegratable at the time of disposal.

[0004]

SUMMARY OF THE INVENTION The present invention stops the use of non-disintegrating materials used for maintaining the functions of existing sanitary materials such as sanitary belts and disposable diapers, and achieves the same function. It uses an inexpensive system which has water-disintegration under certain conditions and which is superior in production efficiency to existing products. That is, the present invention is a water-disintegrating hygienic material having an absorbent sheet such as a sanitary band and a disposable diaper, which contains a hydrophobic polymer as a liquid component permeation layer (1) sequentially from the side in contact with the body. As a printing surface with an opening ratio of 40 to 60% by a printing ink, a printing surface with a printing ink containing a water-soluble polymer and a water-disintegratable pulp or fiber sheet, and an absorption layer (2) Accordingly, a water-disintegratable pulp or fiber sheet containing a super absorbent polymer, a water-disintegratable pulp or fiber sheet laminated with a water-soluble polymer film as a leak-proof layer (3) or coated or impregnated with a water-soluble polymer. -A water-disintegrating hygienic material that has a structure in which the layers consisting of (1) and (2) are overlapped and the periphery is adhered, and furthermore, the water-disintegrating release paper is used as the release paper for the adhesive used for adhering and fixing to clothes. And the hydrophobic polymer is an ethylene-vinyl acetate copolymer,
It relates to a water-disintegrating sanitary material, wherein the water-soluble polymer is polyvinyl alcohol.

That is, as described above, existing sanitary materials such as sanitary belts and disposable diapers have a porous sheet on the surface contacting the body and a leakproof film on the opposite surface. Although used, these materials are non-disintegrating to water, and as a result, after use, it is impossible to put them in a flush toilet and release them. Therefore, in the present invention,
When used, it has a water resistance that can withstand use under conditions where the amount of water is less than the saturated amount of water in the absorbent layer, and when it is put into a flush toilet with a large amount of water, it is a hydrophobic polymer that collapses into water and can be discharged. With a printing ink containing-as a raw material, a polyvinyl alcohol or the like is used to print, on the surface that comes into contact with the body, discrete, non-continuous figures with an aperture ratio of 40 to 60% that can absorb water as a permeation layer. The ink containing the water-soluble polymer described above is used to print a polyvinyl alcohol-based printing surface of a water-disintegratable sheet on which non-continuous separated figures having similar aperture ratios of 40 to 60% are printed.

FIG. 1 is a partially enlarged sectional view showing the concept of the water-disintegrating sanitary material of the present invention. In addition, in FIG.
Although the permeation layer (1), the absorption layer (2) and the leakproof layer (3) are shown as separated from each other, practically, the layers are manufactured in a state of being substantially stacked or close to each other. . Further, in the present invention, other layers can be combined if necessary. Further, as a leak-proof layer (3) on the surface that does not come into contact with the body, continuous printing or impregnation is performed on the entire surface of the water-disintegratable paper with a printing ink made of a water-soluble polymer such as polyvinyl alcohol, or a water-soluble resin. The film is laminated and the resulting water-disintegratable paper is used. The resin concentration of the printable polyvinyl alcohol printing ink or the like is 10 to 20% by weight, but in order to obtain practical leakproofness with the polyvinyl alcohol printing ink having such a concentration. , Water-disintegratable paper impregnated with the ink of 200-400 microns thickness.

Therefore, the purpose of preventing leakage can be achieved with a single sheet having a thickness of 400 microns, but a water-disintegratable paper impregnated with polyvinyl alcohol having an appropriate thickness, such as 100 microns or 200 microns, is used. Can be prepared and used by stacking a number of sheets according to the required leakproof performance. As the printing and coating methods, various methods such as gravure printing, silk screen printing, flexo printing and knife-coating method can be adopted. It should be noted that since existing physiological bands and disposable diapers usually use a film or porous sheet having a thickness of 20 to 100 μm, the thickness of the printed film can be determined based on these values.

The polyvinyl alcohol thin film on the surface of the water-disintegratable sheet (8) is dissolved in water when the raw material of the present invention is put into water, and the printed surface of the surface is separated to form the whole. Will collapse into water. Opening rate of permeation layer (1) 40
Although it is ˜60%, since this value is close to the opening ratio of existing sanitary materials, the absorption of liquid is performed at almost the same rate. The print figure is usually a separated figure as shown in FIG. 2, but may be continuous. The intermediate absorbent layer (2) has the same composition as that used in existing sanitary materials, and the superabsorbent polymer (10) is added if necessary, so that it is suitable for each purpose. Correspondingly, the absorption of the saturated water is substantially performed. As the super absorbent polymer (10) used for sanitary materials,
Mainly vinyl alcohol / acrylic acid copolymer is the main component, and when it comes into contact with water, it absorbs and swells in a short time and exhibits excellent gel strength. For example, a highly water-absorbent polymer that has absorbed water exhibits very little water release even under pressure and exhibits excellent water retention. It shows in Table 1.

[0009]

[Table 1]

Therefore, the absorption layer (2) which has absorbed water to the saturated state
Almost no absorbed water is released under pressure in normal daily life. As above
The permeation layer (1) of the present invention above and below the existing water-disintegratable absorption layer,
By stacking the leak preventive layer (3), a basic material of a sanitary material which is safe at the time of use and can be discharged into the flush toilet after being used by collapsing into water to be discharged can be obtained. Since the surface of the permeation layer (1) of the present invention that comes into contact with the body has a fairly thick printed film such as a hydrophobic ethylene / vinyl acetate copolymer, it wets with water when coming into contact with the user's body. You can avoid the situation. Also,
Since the ethylene / vinyl acetate copolymer serves as a hot melt adhesive, it is possible to form a product similar in shape to conventional products by heat-sealing the periphery of the material of the present invention as necessary when molding the material of the present invention. can do. Moreover, since the printed surface, which has become the hot melt adhesive, is a small, separated, independent figure, it collapses into small pieces of this printed figure when placed in water. The cross-sectional structure of the water-disintegrating sanitary material of the present invention is shown in FIG. FIG. 2 shows a plan view of the printing surface of the ethylene / vinyl acetate copolymer and the printing surface of the polyvinyl alcohol in the permeation layer. In FIG. 2, since the aperture ratio of both is 40 to 60% as described above, it shows almost the same absorption rate as existing products.

In FIG. 1, a pressure-sensitive adhesive layer (4) is provided on the outside of the leak-proof layer (3), which is used for fixing to the clothes when the absorbent material is used as a physiological band. Although it is used for many existing products, the conventional release paper (5) used here is non-disintegrating to water. That is, since the physiological belt as a conventional product is non-disintegrating in water, the release paper for the pressure-sensitive adhesive was also non-disintegrating in water. However,
In the present invention, since the sanitary material body can be made water-disintegratable, it is preferable to prepare and use a water-disintegratable release paper for the pressure-sensitive adhesive used here. The water-disintegratable release paper that can be used in the present invention is prepared as follows.

10 to 20% by weight of a water-soluble polymer (12) such as polyvinyl alcohol on the surface of the water-disintegratable paper (13)
Apply the solution and peel the surface of the silicone (11)
A water-disintegratable release paper (5) is obtained by coating and heating and polymerizing a 5 to 10 wt% solution. The water-soluble polymer used in the present invention may be used in several layers, but may be the same polymer or partially different polymers.

[0013]

The present invention will be described in detail with reference to the following examples.
It goes without saying that the present invention is not limited to these examples. Example 1 A 10% solution of polyvinyl alcohol having a degree of polymerization of 500 was used to form a circle having a diameter of about 2 mm as shown in 15 of FIG.
Prepared by silk screen printing on a water-disintegrating rayon sheet (8) with a thickness of 0.5 mm at intervals of 5 mm.
Furthermore, on this polyvinyl alcohol printed surface (7), ethylene / vinyl acetate copolymer (containing 40% vinyl acetate) 15
% Solution, circles having a diameter of about 5 mm were prepared by silk screen printing at intervals of 1 mm as shown at 14 in FIG. 2 to obtain a water-disintegratable permeation layer (1).

A water-disintegratable leak-proof layer (3) was obtained by impregnating the surface of a water-disintegratable paper having a thickness of 400 microns with the above polyvinyl alcohol 10% solution by printing using a knife coater. Was obtained. As shown in FIG. 1, the permeation layer (1) and the leak preventive layer (3) obtained as described above were superposed on the water-disintegratable absorption layer (2) having a thickness of 2 mm, and the periphery thereof was covered with heat. The sheet was tossed to obtain a physiological band of 7 cm × 15 cm. This product showed a complete leak-proofing function by stacking filter papers containing 3 ml of colored water and leaving it under a pressure of 5 kg for 1 hour.
The physiological zone sample of this example does not have an uncomfortable damp sensation even in a wet state on the surface which comes into contact with the body, maintains a stable state, and disintegrates in 10 minutes when left to stand in 300 ml of water and is flushed with a toilet bowl. It became possible to release it inside. Example 2 On water-disintegratable paper having a thickness of 100 and 200 microns,
A 10% by weight polyvinyl alcohol solution of Example 1 was impregnated by printing using a knife coater to obtain a water-disintegratable leak-proof layer (3). The leak preventive layer (3) of this example is used in Example 1
In order to obtain the sufficient leakproofness by performing the leakproofing test as shown in the above, it is possible to achieve the purpose by superimposing 100 microns x 3 sheets and 200 microns x 2 sheets as follows. It became clear.

In actual use, a water-disintegratable leakproof layer having a thickness of 100 to 400 μm as shown in the examples is prepared, and a combination is determined according to the required leakproof performance. Is desirable. Example 3 A 20% by weight solution of polyvinyl alcohol (12) having an average degree of polymerization of 500 was applied to the surface of a water-disintegratable paper (13) having a thickness of 50 μm using a knife coater and dried. A 10% by weight solution of silicone (11) for peeling was applied on the coated surface of the polyvinyl alcohol with a gravure coater, dried and polymerized by heating to obtain a water-disintegratable release paper. This product shows good releasability and stability as existing non-disintegrating release paper, and disintegrates in water in an extremely short time,
It was shown that it could be discharged into a flush toilet.

In use, the sanitary band obtained by combining Examples 1 and 3 is stripped of a release paper, thrown into a flush toilet and discharged, and the sanitary band is adhesively fixed to clothes. It has become possible to throw it into a flush toilet and release it. Example 4 In Example 1, a water-disintegrating pulp sheet having a thickness of about 5 mm was used as the absorbent layer (2) to make a trial diaper of 20 cm × 30 cm in size. This product showed a complete leak-proof function by stacking filter papers containing 200 ml of colored water and leaving it under a pressure of 5 kg for 1 hour. Furthermore, it was disintegrated easily in 100 ml of water, and it was shown that it can be thrown into a flush toilet.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a constitution of a sanitary material of the present invention.

FIG. 2 is a plan view showing an embodiment of a printed surface of a permeation layer of the present invention. The symbols in the figure are 1-permeation layer, 2-absorption layer, 3-leak-proof layer,
4-Adhesive, 5-Water disintegrating release paper, 6-Opening ratio 40-6
0% hydrophobic print surface, 7-water-soluble polymer print surface with 40-60% aperture ratio, 8-water disintegrating rayon sheet, 9-
Pulp sheet, 10-Super absorbent polymer, 11-Silicone printing surface, 12-Polyvinyl alcohol printing surface, 13
-Water disintegratable paper, 14-ethylene / vinyl acetate copolymer printed surface, and 15-water-soluble polymer printed surface are respectively shown.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location 2119-3B A41B 13/02 E 7108-4C A61F 13/18 330 (72) Inventor Shiro Kojima Tokyo Chuo-ku, Kyobashi 2-3-13 Toyo Ink Manufacturing Co., Ltd. (72) Inventor Fumio Tateshima Tokyo, Chuo-ku, Kyobashi Nichome 3-13 Toyo Inki Manufacturing Co., Ltd. (72) Inventor Mitsuru Endo Kanagawa Prefecture 6-5-19 Shimootachu, Nakahara-ku, Kawasaki-shi

Claims (3)

[Claims] 1. A water-disintegrating sanitary material having an absorbent sheet such as a menstrual band or a disposable diaper, which comprises a hydrophobic polymer as a liquid component permeation layer (1) sequentially from the side in contact with the body. Printed surface with an ink opening ratio of 40-60%, opening ratio with a printing ink containing a water-soluble polymer 40-60%
% Printing surface and water-disintegrating pulp or fiber sheet, absorbent layer (2) optionally containing a superabsorbent polymer, water-disintegrating pulp or fiber sheet, leakproof layer (3)
A water-disintegrating sanitary material having a structure in which a layer comprising a water-soluble polymer film as a laminate or a water-disintegrating pulp or fiber sheet coated or impregnated with a water-soluble polymer is superposed and the periphery is adhered. 2. The water-disintegrating hygienic material according to claim 1, wherein the water-disintegrating release paper is used as the release paper for the pressure-sensitive adhesive used for adhering and fixing to clothes. 3. The water-disintegrating sanitary material according to claim 1, wherein the hydrophobic polymer is an ethylene / vinyl acetate copolymer and the water-soluble polymer is polyvinyl alcohol.