JP7169691B2 - pad - Google Patents

Description

The present technology relates to a pad that is attached to, for example, a toilet bowl and absorbs water such as flush water or shower water.

Conventionally, water-soluble (water-disintegratable) toilet sheets have been proposed. Since the toilet seat is decomposed in water, even if it is flushed down the toilet, the drain pipe will not be clogged. Therefore, the user can flush the toilet seat after use (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2003-210359

BACKGROUND ART If a large object enters equipment for domestic wastewater or sewage treatment, such as a pump or pipe, there is a risk that the equipment will be overloaded.

The present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a pad that has water disintegrability (disintegratability in water) and allows drainage without clogging.

A pad according to an embodiment of the present disclosure includes a water-absorbing layer and surface materials disposed on both sides of the water-absorbing layer, wherein the water-absorbing layer and surface material are water-decomposable.

In one embodiment of the present disclosure, for example, the pad disintegrates in water even if the user peels off the release paper, attaches the pad to the toilet bowl, and then flushes the pad down the toilet.

In a pad according to an embodiment of the present disclosure, the water absorbing layer and the surface material are composed of biodegradable members.

In one embodiment of the present disclosure, the residue of the collapsed pad is biodegraded by, for example, microorganisms and bacteria.

In the pad according to one embodiment of the present disclosure, the water-absorbing layer is a biodegradable plastic containing at least one of natural pulp fiber, polylactic acid fiber, polyhydroxyalkanoic acid fiber, polylactic acid resin powder, or polyhydroxyalkane resin powder. It is a nonwoven fabric having a material.

In one embodiment of the present disclosure, the absorbent layer is hydrolyzed and biodegradable because it is composed of natural pulp fibers and biodegradable plastic materials.

In a pad according to an embodiment of the present disclosure, the water absorbent layer contains 90 to 99 weight percent of the natural pulp fiber and 1 to 10 weight percent of the biodegradable plastic material.

In one embodiment of the present disclosure, natural pulp is used to form low density nonwoven fabrics to enhance water absorbency. In order to form a low-density nonwoven fabric, a biodegradable polylactic acid resin material or polyhydroxyalkane resin material, for example, is used as a heat-sealable binder for bonding natural pulp fibers. For adhesion between natural pulp fibers, for example, heat fusion of polylactic acid fibers or polyhydroxyalkanoic acid fibers can be used. For bonding with the surface material, for example, polylactic acid resin powder or polyhydroxyalkane resin powder can be used. Since polylactic acid fiber, polylactic acid resin powder, polyhydroxyalkanoic acid fiber, or polyhydroxyalkane resin powder is relatively expensive, it is required to use it in a small amount. On the other hand, if the content is too small, it becomes difficult to maintain the shape of the nonwoven fabric, and the amount of paper powder generated increases. Therefore, the natural pulp fiber and the biodegradable plastic material can be adjusted to the weight percentages as described above to achieve both reduction in manufacturing cost and retention of molding.

In a pad according to an embodiment of the present disclosure, the water absorption layer contains 5 weight percent or less of an olefinic resin material or a cyclic olefinic resin material.

In one embodiment of the present disclosure, fibers and resin powders made of olefinic resins or cyclic olefinic resins are used as binders. The olefinic resin or cyclic olefinic resin is not biodegradable and may increase the amount of scum. By making it 5% by weight or less, there is almost no effect on the disintegratability and flowability in water.

In the pad according to one embodiment of the present disclosure, the density of the water absorbing layer and the surface material is 0.03-0.08 g/cm ³ .

In one embodiment of the present disclosure, both sufficient water absorbency and strength of the water absorbing layer are achieved. On the other hand, if the density is too low, it will be difficult to maintain the shape of the product, and if it is too high, disintegration in water will be hindered. By setting the density within the above range, it is possible to achieve both retention of product shape and disintegration in water.

A pad according to an embodiment of the present disclosure includes an adhesive disposed on one of the surface materials, and the weight of the water absorbing layer, the surface material and the adhesive is 10 g or less.

In one embodiment of the present disclosure, the flowability of the pad is ensured within the drainpipe. In addition, by making it 10 g or less, the pad collapses even with a small amount of flush water, for example, 3.8 liters/time flush water in a water-saving toilet, and is easily discharged from the toilet bowl and easily circulated in the drain pipe. . Also, in a waste water treatment machine or a waste water treatment plant, entanglement of the impeller of the drain pump or clogging of the gaps of the case is less likely to occur.

A pad according to an embodiment of the present disclosure includes an adhesive disposed on one of the surface materials, and a peelable release paper covering the adhesive.

In one embodiment of the present disclosure, the user can attach the pad to the object by simply peeling off the release paper. In addition, when the release paper does not have water decomposability and biodegradability, the release paper alone can be disposed of by a method different from the method of disposing of the water absorbing layer and surface material without throwing it into the waste water. .

A pad according to an embodiment of the present disclosure is attached to the upper or peripheral surface of a toilet bowl.

In one embodiment of the present disclosure, it is attached to the upper surface or the peripheral surface of the toilet to prevent small water or shower water from leaking from between the toilet bowl and the toilet seat and to adhere to the floor along the peripheral surface. prevent.

In the pad according to one embodiment of the present disclosure, for example, even if the user peels off the release paper, attaches the pad to the toilet bowl, and then flushes the pad down the toilet, the pad will collapse in water and the water pipe clogging can be prevented. That is, it is possible to prevent clogging of facilities for domestic wastewater or sewage treatment, such as pumps or pipes, and to reduce the load on the facilities.

1 is a schematic perspective view of a pad according to an embodiment; FIG. FIG. 2 is a schematic cross-sectional view in which the II-II line shown in FIG. 1 is taken as a cutting line; It is a schematic diagram which briefly shows the structure of a water absorption layer. Fig. 3 is a schematic perspective view of the pad attached to the toilet; 1 is a schematic diagram schematically showing the configuration of a flowability testing apparatus according to the Tosa method used at the Kochi Prefectural Paper Industry Technology Center. FIG. FIG. 10 is a table showing the total number of tests N, the DC value for each of the specimens with different weights; FIG. It is a graph which shows the DC value with respect to the weight of a test piece.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the drawings showing pads according to embodiments. 1 is a schematic perspective view of the pad, FIG. 2 is a schematic cross-sectional view taken along line II-II shown in FIG. 1, and FIG. 3 is a schematic diagram schematically illustrating the structure of the water absorbing layer. In the following description, up, down, front, back, left, and right shown in the drawings are appropriately used.

As shown in FIG. 1, the pad 1 is arcuate and belt-shaped in plan view. The length of the pad 1 (horizontal dimension in FIG. 1) is, for example, 50 to 200 mm, the width of the pad 1 (front and rear dimension in FIG. 1) is, for example, 20 to 60 mm, and the thickness of the pad 1 (vertical dimension in FIG. dimension) is, for example, 3 to 15 mm. The pad 1 may be formed in a rectangular shape in plan view.

As shown in FIG. 2, the pad 1 comprises a water absorbing layer 10, two surface materials 11, an adhesive 12, and a release paper 13. As shown in FIG. The water absorbing layer 10 is a nonwoven fabric having natural pulp fibers and a biodegradable plastic material containing polylactic acid fibers and polylactic acid resin powder. The absorbent layer 10 comprises 90-99 weight percent natural pulp fibers and 1-10 weight percent biodegradable plastic material. For example, as shown in FIG. 3, the water absorbing layer 10 is a nonwoven fabric comprising natural pulp fibers 10a, polylactic acid fibers 10b, and polylactic acid resin powder 10c. The polylactic acid fiber 10b is designed so that the average length of the polylactic acid fiber 10b is longer than that of the natural pulp fiber 10a, forming a very rough skeleton. A biodegradable plastic material containing polyhydroxyalkanoic acid fiber or polyhydroxyalkane resin powder may be used instead of polylactic acid fiber 10b or polylactic acid resin powder 10c.

Natural pulp fibers 10a are arranged inside the skeleton. The density of the natural pulp fibers 10a is coarse. Polylactic acid connects the polylactic acid fibers 10b, the polylactic acid fibers 10b and the natural pulp fibers 10a, or the natural pulp fibers 10a. A soft cotton-like non-woven fabric is formed from the natural pulp fibers 10a, the polylactic acid fibers 10b, and the polylactic acid resin powder 10c. All of the natural pulp fibers 10a, the polylactic acid fibers 10b, and the polylactic acid resin powder 10c are water-degradable and biodegradable. Here, the term "water disintegratability" refers to the property of disintegrating in water. Henceforth, water-disintegratability is also called disintegratability. Biodegradability refers to the ability of a compound to be broken down by bacteria, fungi, and other organisms.

As the thermal adhesive (binder), an olefinic resin material or a cyclic olefinic resin material may be used within 5% by weight that does not impede the biodegradability of the pad 1 .

A surface material 11 is provided on each of both surfaces of the water absorbing layer 10 . The surface material 11 has water decomposability. The surface material 11 is, for example, a non-woven fabric comprising natural pulp fibers and rayon fibers. Natural pulp fibers and rayon fibers are biodegradable.

When one surface of the water absorbing layer 10 faces upward and the other surface faces downward, an adhesive 12 is provided on the surface material 11 arranged on the lower side. The adhesive 12 is arranged discontinuously on the surface material 11, for example, in dots. Examples of the adhesive 12 include acrylic adhesives and polyvinyl acetate adhesives. As the adhesive 12, for example, a biodegradable adhesive containing polylactic acid as a main raw material, or a biodegradable adhesive obtained by blending a biodegradable substance with an elastomer derived from natural rubber may be used. . Note that the adhesive 12 may be continuously provided on the surface material 11 .

The adhesive 12 is covered with a release paper 13 . The release paper 13 is made of paper, for example, and is surface-treated so that it can be separated from the adhesive 12 .

The pad 1 is manufactured as follows using a dry nonwoven fabric manufacturing method such as an airlaid method. Crushed natural pulp fibers 10a, polylactic acid fibers 10b, and polylactic acid resin powder 10c are mixed on the raw material of one surface material 11, laminated and molded, and the raw material of the other surface material 11 is placed on the upper surface. The rolls are piled up and heat-molded to form the pad 1 . Next, a release paper 13 pre-coated with an adhesive 12 is press-bonded to one of the surface members 11 via the adhesive 12, and cut into a product shape. The manufacturing method of the pad 1 is not limited to the airlaid method. Also, the adhesive 12 and the release paper 13 may be omitted.

From the viewpoint of water absorption, strength, thickness, etc. of the water absorbing layer 10 and the surface material 11, the density of the water absorbing layer 10 and the two surface materials 11 is 0.03 in the state where the adhesive 12 and the release paper 13 are not provided. The pad 1 is manufactured to have a weight of ~0.08 g/cm ³ , preferably 0.04-0.06 g/cm ³ . The density was measured according to JIS L1913:2010 General nonwoven fabric test methods 6.1 (thickness) and 6.2 (weight per unit area). If the density is too low, it will be difficult to maintain the shape of the product, and if it is too high, disintegration in water will be hindered. By setting the density within the above range, it is possible to achieve both retention of product shape and disintegration in water. In addition, the water absorbing layer has both sufficient water absorption and strength.

From the viewpoint of flowability in the drainage pipe, the weight of the pad 1 after cutting (the weight of the water absorbing layer 10, the surface material 11 and the adhesive 12, in other words, the product weight excluding the release paper 13 covering the adhesive 12 (20 C., 65% relative humidity)) is 10 g or less. As will be described later, the weight of the pad 1 excluding the release paper 13 is preferably 8 g or less, more preferably 6 g or less, and even more preferably 4 g or less in consideration of flowability.

FIG. 4 is a schematic perspective view of the pad 1 attached to the toilet. The toilet 2 includes a toilet bowl 21 , a toilet seat 22 and a toilet lid 23 . The toilet bowl 21 is a Western-style toilet bowl and has an opening 2a at the top. An upper surface (toilet upper edge) 2b bordering the opening 2a forms a ring shape in plan view and forms a flat surface. The front portion of the upper edge 2b of the toilet bowl is arcuate and strip-shaped in plan view. A pivot shaft 210 is provided at the rear portion of the toilet bowl 21, with the left-right direction as the axial direction.

The toilet seat 22 is an O-shaped toilet seat. The toilet seat 22 has an annular plate shape. A hole 220 is provided in the central portion of the toilet seat 22 corresponding to the opening 2a. A rear portion of the toilet seat 22 is rotatably supported by the toilet bowl 21 via a pivot 210 . Therefore, the toilet seat 22 can swing around the pivot 210 by raising and lowering the front portion of the toilet seat 22 . When using the toilet 2 in a standing posture facing the toilet bowl 21, the toilet seat 22 is raised.

When sitting on the toilet seat 22 and using the toilet 2, the toilet seat 22 is lowered. When the toilet seat 22 is lowered, the upper surface of the toilet seat 22 is the seat surface, and the lower surface is the toilet seat back 22a. Four elastic projections 221 are provided on the toilet seat back 22a. Therefore, the seat back 22a of the lowered toilet seat 22 and the upper edge 2b of the toilet are arranged to face each other. At this time, the elastic protrusions 221 contact the upper edge 2b of the toilet bowl and support the toilet seat 22. As shown in FIG. Two elastic protrusions 221 are arranged on each of the left and right portions of the toilet seat back 22a, excluding the front and rear portions of the toilet seat back 22a.

The pad 1 is attached to, for example, the front part of the upper edge 2b of the toilet bowl with the adhesive 12 facing downward, with the release paper 13 removed. The pad 1 is adhered to the upper edge 2b of the toilet bowl with the curvature of the pad 1 corresponding to the curvature of the upper edge 2b of the toilet bowl. In FIG. 4, one pad 1 is attached to the upper edge 2b of the toilet bowl. The width of the pad 1 (dimension in the radial direction of the toilet) is substantially the same as the width of the upper edge 2b of the toilet (dimension in the radial direction of the toilet), and the pad 1 covers the entire upper edge 2b of the toilet in the width direction. It is preferable that the pad 1 is arranged at a place where it is not sandwiched between the elastic projection 221 and the upper edge 2b of the toilet bowl. The attachment position of the pad 1 is not limited to the upper edge 2b of the toilet bowl, and may be provided on the outer peripheral surface (side surface) of the toilet bowl 21, for example.

Since the elastic projection 221 is interposed between the toilet seat back 22a of the lowered toilet seat 22 and the upper edge 2b of the toilet bowl, a gap is generated. The thickness (vertical dimension) of the pad 1 is substantially the same as this gap or slightly thicker than this gap. Therefore, when the toilet seat 22 is lowered, the gap is closed by the pad 1 at the front portion of the upper edge 2b of the toilet bowl. In other words, the pad 1 is manufactured so as to have a thickness that can close the gap. By providing the pad 1 in the gap, small water or shower water can be prevented from leaking from between the toilet bowl 21 and the toilet seat 22 . Further, by providing the pad 1 on the outer peripheral surface of the toilet bowl 21, it is possible to prevent small water or shower water from running along the outer peripheral surface and adhering to the floor.

The toilet lid 23 has an oval plate shape that covers the toilet seat 22 . A rear portion of the toilet lid 23 is rotatably supported by the toilet bowl 21 via a pivot 210 . Therefore, when the front portion of the toilet lid 23 is lowered, the toilet seat 22 is covered by the downwardly swung toilet lid 23 . On the other hand, when the front portion of the toilet lid 23 is lifted, the toilet lid 23 swings upward and separates from the toilet seat 22 .

The water disintegratability (disintegratability) of the pad 1 will be described. The disintegrability of the pad 1 was confirmed based on the guidelines (Edition 4 of the Guidelines for Assessing the Flush ability of Disposable Nonwoven Products) established by EDANA (European Disposables And Nonwovens Association).

Specifically, a slosh box disintegration test was performed. In the slosh box disintegration test, 2 liters of water and a test piece are placed in a given box, and the box is rotated at a rotation speed of 26 rpm for 60 minutes. Thereafter, the residue remaining in the strainer is dried through a strainer having a plurality of holes with a diameter of 12.5 mm, and the ratio of the residue to the weight of the test piece before input is determined. If this ratio is less than 35%, it has sufficient disintegration properties and can be flushed down the drain. The test piece this time is the pad 1 excluding the release paper 13 . As will be described later, it was determined that the test piece had sufficiently disintegrated after 30 minutes had passed, so the rotation time was set to 30 minutes.

The above disintegration test was performed three times. The weight of each pad 1 before being put in is 3.94 g. The first test gave a dry weight of residue left on the strainer of 0.27 g, the second test gave a dry weight of residue left on the strainer of 0.27 g, the third test test, the dry weight of the residue left on the strainer was 0.08 g. When converted to the above ratio, the first ratio is 0.27/3.94 = 6.85%, the second ratio is 0.27/3.94 = 6.85%, and the third ratio is The ratio was 0.08/3.94=2.03%. In all tests, the ratio was less than 35%, indicating sufficient disintegration. According to the guideline, the box should be rotated for 60 minutes, but in the test for Pad 1 this time, it was possible to meet the above criteria by rotating it for only half, 30 minutes.

Next, the fluidity test of the pad 1 will be explained. FIG. 5 is a schematic diagram schematically showing the configuration of a flowability testing apparatus according to the Tosa method used at the Kochi Prefectural Paper Industry Technology Center. The fluidity of the pad 1 will be explained. The flowability of Pad 1 was confirmed based on the product evaluation system (Tosa method) that can be flushed down the toilet. Specifically, the test was conducted using the flowability testing apparatus shown in FIG.

The fluidity testing apparatus includes a water-saving type II toilet bowl C910S (hereinafter referred to as toilet bowl 3 ), a first drain pipe 4 , a second drain pipe 5 and a third drain pipe 6 . The amount of flushing water per flush of the toilet bowl 3 is 3.8 liters assuming the amount of flushing water of a super water-saving toilet. The first drain pipe 4 has a length of 30 cm and a nominal diameter of 75 mm, and extends vertically downward from the toilet bowl 3 . The second drain pipe 5 has a length of 1 m, a nominal diameter of 75 mm, and extends horizontally. The second drain pipe 5 is connected to the first drain pipe 4 via a right angle elbow with a slope of 1/100. The third drain pipe 6 is composed of a plurality of drain pipes and sockets. The third drain pipe 6 has a length of 10 m, a nominal diameter of 100 mm, and extends horizontally. The third drain pipe 6 is connected to the second drain pipe 5 at a slope of 1/100 via a right angle elbow and a VU reducing socket. The third drain pipe 6 may be composed of a single drain pipe.

The flowability test was conducted based on the Tosa method test method using a testing machine at the Paper Industry Technology Center. The washing operation is performed on the toilet bowl 3 continuously for a predetermined number of times. A given number of washes is counted as one test. This time, the maximum number of consecutive washings of four times was defined as one test number. If the test piece is discharged from the fluidity test device by washing less than 4 times, that is, if it is discharged from the third drain pipe 6, no further washing is necessary. was counted as one test. For example, when the test piece was ejected from the fluidity testing device by washing twice in succession, washing twice was counted as one test.

In the fluidity test, a DC (Drained or Clogged value) value (%) is determined. A DC value is calculated by the following formula.
DC value = (number of dwells/total number of tests) x 100
The number of stays refers to the number of times the test piece stays in the drainage pipe of the fluidity tester.

FIG. 6 is a table showing the total number of tests, N, and the DC value for each of the specimens with different weights. In FIG. 6, the weight indicates the weight (g) of the test piece, and the 1st to 4th washings indicate the order of the maximum number of consecutive 4 washings.

In the test using one specimen weighing 2.1 g, the total number of tests is 8, the DC value in the first wash is 37.5% and the DC value in the second wash is 0%. That is, a test piece with a weight of 2.1 g is discharged from the fluidity tester after washing twice or less.

In the test using one specimen weighing 2.8 g, the total number of tests is 6, the DC value in the first wash is 50% and the DC value in the second wash is 0%. That is, within two washes, a test piece with a weight of 2.8 g is discharged from the fluidity tester.

In the test using one specimen weighing 3.4 g, the total number of tests is 8, the DC value in the first wash is 75% and the DC value in the second wash is 0%. That is, a test piece with a weight of 3.4 g is discharged from the fluidity tester after washing two times or less.

In the test using one specimen weighing 4.2 g, the total number of tests was 50, the DC value in the 1st wash was 96%, the DC value in the 2nd wash was 18%, the 3rd wash DC value is 4% and DC value in the 4th wash is 2%.

In the tests using the 8.5 g weight specimens, two 4.2 g weight specimens were used. In this test, the total number of tests was 10, the 1st wash had a DC value of 100%, the 2nd wash had a DC value of 80%, the 3rd wash had a DC value of 20%, and the 4th wash had a DC value of 80%. The DC value at is 10%.

In the test using the 12.7 g weight specimen, three 4.2 g weight specimens were used. In this test, the total number of tests is 5, the DC value is 100% for the first 3 washes, and the DC value is 80% for the 4th wash.

The retention of the pad 1 shown in the above test results is all seen in the third drain pipe 6 in FIG. It was easily distributed and no retention was observed.

FIG. 7 is a graph showing the DC value against the weight of the test piece. In FIG. 7, white circles represent test results of a test piece weighing 2.1 g, white triangles represent test results of a test piece weighing 2.8 g, and white squares represent test results of a test piece weighing 3.4 g. , The black circles are the test results of the test piece weighing 4.2 g, the cross marks are the test results of the test piece weighing 8.5 g, and the black squares are the test results of the test piece weighing 12.7 g. It is. In addition, L1 represents a graph of an approximation formula of a linear function derived from the DC value in the first wash, L2 represents a graph of an approximation formula of a linear function derived from the DC value in the second wash, and L3 is A graph of a linear function approximation formula derived from the DC value in the third wash is shown, and L4 represents a graph of a linear function approximation formula derived from the DC value in the fourth wash.

It is preferable that the pad 1 is discharged quickly, and considering the number of washings acceptable to the user, the number of times of washing required for discharging is preferably 3 times or less, more preferably 2 times or less. According to the graph L3, the weight of the pad 1 (excluding the release paper 13) that can be discharged by washing within three times, that is, the weight of the pad 1 at which the DC value is 0% in the graph L3 is about 7.0 g. be. Also, the weight of the pad 1 that has a DC value of 20% or less after washing three times or less is about 8.2 g. Since the weight of the pad 1 at which the DC value is 0% is about 7.0 g, 7 g is a critical value, but considering the probability of rapid discharge, a smaller value of 6 g is preferable.

According to the graph L2, the weight of the pad 1 (excluding the release paper 13) that can be discharged by washing within two times, that is, the weight of the pad 1 at which the DC value is 0% in the graph L2 is about 3.5 g. be. Moreover, the weight of the pad 1 that has a DC value of 20% or less after washing twice or less is about 4.5 g. Therefore, from the viewpoint of ensuring fluidity, the weight of the pad 1 excluding the release paper 13 is desirably 8 g or less, more preferably 6 g or less, and more preferably 4 g or less.

In the pad 1 according to the embodiment, for example, even when the user peels off the release paper 13, attaches the pad 1 to the toilet bowl, and flushes the used pad 1 down the toilet, the pad 1 disintegrates in water, Clogging of water pipes can be prevented. Therefore, it is possible to reduce the load on facilities for domestic wastewater or sewage treatment, such as pumps or pipes. Moreover, the residue of the collapsed pad 1 is biodegraded into carbon, water, and the like by bacteria, for example, so that the burden on the environment can be reduced. The shape of the pad 1 is not limited as long as it has at least collapsibility.

The embodiments disclosed this time should be considered as examples in all respects and not restrictive. The technical features described in each embodiment can be combined with each other, and the scope of the present invention is intended to include all modifications within the scope of the claims and the scope of equivalents to the scope of the claims. be done.

REFERENCE SIGNS LIST 1 pad 10 water absorbing layer 11 surface material 12 adhesive 13 release paper 10a natural pulp fiber 10b polylactic acid fiber 10c polylactic acid resin powder

Claims (7)

a water absorbing layer;
and surface materials arranged on both sides of the water absorbing layer,
The water absorption layer and the surface material have water decomposability,
An adhesive disposed on one of the surface materials,
The weight of the water absorbing layer, the surface material and the adhesive is 8 g or less, and the DC value (Drained or Clogged value) is 20% or less after washing 3 times or less,
The density of the water absorbing layer and the surface material is 0.03-0.08 g/cm ³
pad. The water absorption layer is
natural pulp fibers;
The pad according to claim 1, which is a nonwoven fabric comprising: a biodegradable plastic material containing at least one of polylactic acid fiber, polyhydroxyalkanoic acid fiber, polylactic acid resin powder or polyhydroxyalkane resin powder. The water absorption layer is
90 to 99 weight percent of the natural pulp fiber;
3. The pad of claim 2 , comprising 1 to 10 weight percent of said biodegradable plastic material. 4. The pad according to claim 3 , wherein the water absorbing layer contains 5% by weight or less of the olefinic resin material or the cyclic olefinic resin material. The pad according to any one of claims 1 to 4 , wherein the water absorbing layer and the surface material are made of a biodegradable member. 6. The pad according to any one of claims 1 to 5 , comprising a peelable release paper covering the adhesive. 7. The pad according to any one of claims 1 to 6 , which is attached to the upper or peripheral surface of a toilet bowl.

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