JPH11293208A - Foam coated with pressure-sensitive adhesive and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easily applicable and easily re-stickable foam provided with a weakly pressure-sensitive adhesive layer. SOLUTION: The pressure-sensitive-adhesive-coated foam 10 is prepared by laminating a weakly pressure-sensitive adhesive layer 12 on at least either surface of a sheety polyurethane foam 11. The surface of the foam 11 is self- skinning or open-cellular. The layer 12 is made from a liquid reactive polyurethane pressure-sensitive adhesive based on a polyol and isocyanate, and bonds to the foam 11 by reaction to establish a state in which a part of the layer 12 penetrates into the cells of the foam 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyurethane-based pressure-sensitive adhesive foam body suitable for use as, for example, a sealing material, a cushioning material, a gasket or a soundproofing material, and a method for producing the same.

[0002]

2. Description of the Related Art There has been known a foam with an adhesive in which an adhesive is provided on at least one surface of a foam (a foam) such as a polyurethane foam, a polyethylene foam, and a rubber foam. A so-called double-sided pressure-sensitive adhesive tape is used as a means for fixing this kind of foam body to a mating surface of various devices or the like.

When a double-sided pressure-sensitive adhesive tape is used, a double-sided pressure-sensitive adhesive tape with a release liner, such as origami paper, is laminated on urethane foam in advance, and the release liner is peeled off when fixing to a mating surface of various devices. The adhesive of the adhesive tape is stuck on the mating surface.

As another method for providing the pressure-sensitive adhesive layer on the foam body, a method called so-called straightening, that is, a method in which a pressure-sensitive adhesive solution is applied to a release liner such as origami paper and the pressure-sensitive adhesive is dried. A method of laminating a foam body such as urethane is also known.

[0005]

However, double-sided pressure-sensitive adhesive tapes have problems such as the need for coating a pressure-sensitive adhesive on both the front and back surfaces of a thin base material, which requires a relatively large number of steps in production, and is expensive. In addition, when performing re-attachment after construction or removal after use, the adhesive of the double-sided pressure-sensitive adhesive tape sometimes remains on the mating surface.

[0006] Considering cost and ease of construction, it is desirable not to use a release liner. However, when a foam with an adhesive is wound up without using a release liner, the foams are stuck together via the adhesive, and a phenomenon called so-called blocking occurs. In order to prevent this blocking to some extent, it is effective to make the pressure-sensitive adhesive so-called hard, but when the pressure-sensitive adhesive is hardened, the lamination strength between the foam body and the pressure-sensitive adhesive is weakened, so that the pressure-sensitive adhesive is easily peeled off from the foam body. Not only that, but also the adhesive strength to the mating surface becomes weaker.

When a release liner is used, it is necessary to apply a silicone treatment to the release liner in order to improve the releasability of the pressure-sensitive adhesive layer. However, when the silicone treatment is performed, a silicone compound which is harmful to electronic devices may be generated, so that it cannot be used for some electronic devices and precision devices. Although a pressure-sensitive adhesive having a special polycarbonate structure without using silicone has been proposed, the pressure-sensitive adhesive has a problem in cleanliness because it contains a solvent, and its use is limited in electronic devices and the like.

On the other hand, when the foam is laminated on a release liner with an adhesive by the above-described straightening, when the pressure-sensitive adhesive layer is weakly adherent, the lamination strength with the foam is low, so that the pressure-sensitive adhesive layer is It is easy to peel off from the foam. Conversely, if the pressure-sensitive adhesive layer is too sticky, for example, if it is to be peeled off from the counterpart to be pasted in order to reapply this foam body during construction, the foam body may be broken, making it difficult to reapply. Become. In this specification, the term "weak adhesive" means adhesiveness that can be easily removed even when the adhesive is pressed against a finger or a mating surface.

Therefore, an object of the present invention is to provide a method of laminating a weakly tacky pressure-sensitive adhesive layer which does not cause blocking and is easy to reattach to a foam body without any problem, and which is free of a silicone compound and a solvent. An object of the present invention is to provide a foam body with an adhesive and a method for producing the same.

[0010]

According to the present invention, there is provided a pressure-sensitive adhesive foam according to the present invention, comprising a liquid reactive polyurethane pressure-sensitive adhesive layer containing a polyol and an isocyanate as main components on at least one surface of the foam. It is characterized by being laminated. As the foam (foam), a flexible foam such as polyurethane foam, polyethylene foam, polypropylene foam, and rubber foam is used.

These foams are obtained by slicing a sheet-like material cut out from a block-like material, a sheet-like material having a self-skin, which is thinly foamed into a sheet, or a sheet-like foam having a self-skin. By doing so, a sheet having a thickness of about 0.5 to 50 mm having a self-skin layer on one side and a cell opening surface on the other side.

The surface condition of the self-skin is selected according to the intended use. For example, there are a smooth mirror-like surface and a matte surface having irregularities, and the release liner is arranged so as to be in contact with the foam when foamed. Is transferred as it is. In particular, a polyurethane foam having a self-skin is preferable because it has adhesion to the polyurethane-based pressure-sensitive adhesive of the present invention.

[0013] Since the matte skin has a property of not easily adhering to the polyurethane-based pressure-sensitive adhesive, it does not easily cause blocking even when wound in a roll without a release liner. In the case of a polyurethane foam having self-skins on both front and back sides, the above-mentioned polyurethane-based adhesive is adhered to the self-skins on both front and back sides, and sliced to form a cell opening surface on the back side (non-adhesive side) of the polyurethane foam. Is done. Since the cell opening surface has a property of not easily adhering to the polyurethane-based pressure-sensitive adhesive, even if the cell opening surface is wound in a roll without a release liner, blocking is unlikely to occur.

The polyurethane-based pressure-sensitive adhesive layer used in the present invention is made from a material containing a polyol, an isocyanate, a crosslinking agent, and, if necessary, a tackifier. The polyol and the polyisocyanate may be reacted in advance as a prepolymer.

The kind of polyol and the kind of polyisocyanate may be general ones, but the degree of crosslinking of the polyurethane pressure-sensitive adhesive and the size and degree of the graft or branch may be devised in order to impart tackiness.

In the present invention, since the above-mentioned multi-component liquid reactive urethane-based pressure-sensitive adhesive is used, it is easy to obtain a desired pressure while controlling the cross-linking thereof, and the foam and the pressure-sensitive adhesive form an anchor and a reaction. Lamination is firmly performed by adhesion, and lamination with the foam body can be performed at a wide timing, so that the adhesive property is stable.

In the case of a solvent-type polyurethane-based pressure-sensitive adhesive, if the solvent is dried and then laminated on a foam, the pressure-sensitive adhesive layer has an excessively high strength, so that lamination with the foam is difficult. Therefore, if the lamination is forcibly performed before the solvent is dried, a problem occurs that the pressure-sensitive adhesive solution impregnates the foam body and the foam body swells.

The present invention includes that the foam body is a sheet-like polyurethane foam. The present invention also includes that the sheet-like polyurethane foam has a self-skin on both front and back surfaces, and the polyurethane-based pressure-sensitive adhesive layer is laminated on one self-skin. Further, one surface of the sheet-like polyurethane foam may be a mat-like skin having irregularities, and the polyurethane-based pressure-sensitive adhesive layer may be laminated on the other surface.

Further, according to the present invention, one surface of the sheet-like polyurethane foam is a self-skin and the other surface is a cell opening surface, and the polyurethane-based pressure-sensitive adhesive layer is laminated on the cell opening surface. including. Further, one surface of the sheet-like polyurethane foam is a self-skin, the other surface is a cell opening surface, and the polyurethane adhesive layer is laminated on the self-skin.

Further, the present invention includes laminating a release liner on the pressure-sensitive adhesive layer, and winding the resultant in a roll via the release liner, and winding the film in a roll without providing a release liner in the pressure-sensitive adhesive layer. Including.

The process for producing a foam with a pressure-sensitive adhesive of the present invention comprises the steps of foam-forming the foam and coating a liquid reactive polyurethane-based pressure-sensitive adhesive layer containing polyol and isocyanate as main components on a release liner. And laminating the foam when the applied liquid reactive polyurethane-based pressure-sensitive adhesive layer is in an uncured state.

Further, in the method for producing a foam with an adhesive according to the present invention, a step of applying and curing a liquid reactive polyurethane-based adhesive layer containing a polyol and an isocyanate as a main component on a release liner; Foaming a sheet-like polyurethane foam by coating and foaming a urethane stock solution containing polyol and isocyanate as main components on the layer and laminating the polyurethane foam to the pressure-sensitive adhesive layer. I have. Foam body with an adhesive of the present invention, for example, as a waterproof seal material, or as a gasket material for electronic equipment,
The excellent performance can be fully exhibited.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to the drawings. The foam body 10 with an adhesive according to one embodiment shown in FIGS. 1 and 2 is a sheet-like polyurethane foam 11 as a flexible soft foam body.
And a pressure-sensitive adhesive layer 12 laminated on at least one of the front and back surfaces of the polyurethane foam 11, and a release liner 13 laminated so as to cover the pressure-sensitive adhesive layer 12. FIG. 1 shows a part of the release liner 13
2 shows a state where it is peeled off from No. 2.

For the pressure-sensitive adhesive layer 12, a multi-component reaction-type liquid polyurethane-based pressure-sensitive adhesive mainly containing a polyol component and a polyisocyanate component is used. The thickness of the pressure-sensitive adhesive layer 12 is suitably from 10 μm to 2000 μm. Since the pressure-sensitive adhesive layer 12 is a reaction type mainly composed of a liquid resin, it does not need to use a solvent and has a high cleanness. The pressure-sensitive adhesive layer 12 made of a polyurethane-based pressure-sensitive adhesive can be easily obtained with a low tackiness that does not easily cause blocking, and the re-sticking property is also greatly improved.

The term "weak adhesiveness" as used herein is not a quantified concept, but the adhesive is so sticky that a human finger is pressed against the adhesive, that is, even if the adhesive is stuck to the surface to be stuck, It means stickiness that can be re-attached to the extent that it can be peeled off.

As an example of the release liner 13, a laminate obtained by laminating a non-silicone plastic film (for example, a polyethylene film, polymethylpentene, or a polypropylene film) on paper can be used. The release liner 13 may be a single unit made of only the plastic film without using paper in some cases. In addition, a non-silicone coating layer of polypropylene, polyethylene, polymethylpentene, fluororesin, or the like may be provided as a scribe treatment.

The polyurethane foam 11 is prepared by mixing a suitable number of foaming agents (eg, water) and an auxiliary foaming agent with the polyol and isocyanate, which are the main components thereof, and foaming the mixture, followed by curing at an appropriate temperature and time. Molded. The temperature during foaming of the polyurethane foam 11 is, for example, 30 ° C. to 90 ° C., and the curing temperature is 120 ° C. or less.

In this embodiment, since the polyurethane foam 11 and the polyurethane-based pressure-sensitive adhesive layer 12 are reactively bonded to each other, the bonding interface between the polyurethane foam 11 and the pressure-sensitive adhesive layer 12 is schematically shown in FIG. A part of the pressure-sensitive adhesive layer 12 is a cell 11 s of the polyurethane foam 11.
The active groups on the surface of the foam body and the adhesive layer 12 are reactively bonded to each other.
Therefore, a high laminate strength is exhibited.

Hereinafter, a first embodiment of a method for manufacturing the foam body 10 with an adhesive will be described with reference to FIG. This first production method comprises a step of foam-forming a sheet-like polyurethane foam 11 in advance, and a step of coating a liquid reactive polyurethane-based pressure-sensitive adhesive layer 12 mainly containing a polyol and an isocyanate on a release liner 13. And a laminating step of laminating the polyurethane foam 11 when the applied pressure-sensitive adhesive layer 12 is uncured.

More specifically, in the pressure-sensitive adhesive coating step, a liquid pressure-sensitive adhesive 12a is applied to a predetermined thickness on the release liner 13 by a coating device 20, as shown in FIG. The coating device 20 is a knife coater.
21 or other well-known spray coater, roll coater, die coater, etc.
What is necessary is just to be able to apply 2a thinly and uniformly.

In the laminating step, before the pressure-sensitive adhesive layer 12 is cured, the polyurethane foam 11 previously foamed and formed into a sheet is laminated and the pressure-sensitive adhesive layer 12 is cured. By doing this,
The polyurethane foam 11 and the pressure-sensitive adhesive layer 12 react and adhere, and the pressure-sensitive adhesive layer 12 is cured. 120 ° C
By heating to the extent, the curing of the pressure-sensitive adhesive layer 12 can be accelerated.

Since the pressure-sensitive adhesive layer 12 is a multi-component liquid reaction type containing a polyol and an isocyanate as main components, the reaction rate can be increased, and a predetermined pressure-sensitive adhesive property can be exhibited immediately after production. it can.

Hereinafter, a second embodiment of the method of manufacturing the foam body 10 with the adhesive will be described with reference to FIGS. This second production method comprises a step of applying and curing a liquid reactive polyurethane-based pressure-sensitive adhesive layer 12 containing a polyol and an isocyanate as a main component on a release liner 13, and a step of forming a cured pressure-sensitive adhesive layer. And a foam laminating step of laminating the polyurethane foam 11 to the pressure-sensitive adhesive layer 12 while foaming and molding the sheet-like polyurethane foam 11 by coating and foaming a polyurethane foam stock solution on the polyurethane foam 12.

More specifically, in the pressure-sensitive adhesive layer forming step, as shown in FIG. 5, a liquid pressure-sensitive adhesive 12a is supplied onto a release liner 13, spread thinly, and cured to form a pressure-sensitive adhesive having the pressure-sensitive adhesive layer 12. Sheet 25
Form.

Next, in the foam laminating step,
As shown in FIG. 6, a urethane stock solution 11a is applied to a predetermined thickness on the pressure-sensitive adhesive layer 12 by a coating device 30, and foamed and cured. Since the urethane stock solution 11a used here forms the polyurethane foam 11, normal foaming can be performed in combination with the polyurethane-based pressure-sensitive adhesive layer 12. Then, the polyurethane foam 11 is cured in an oven at room temperature or high temperature.

By foaming without providing a release liner such as release paper on the upper surface side of the polyurethane foam 11, a self-skin can be formed on the surface of the polyurethane foam 11. Further, by slicing the polyurethane foam 11, the cell opening surface 11c may be formed at the cut surface.

For example, as shown in FIG. 7, a cell opening surface 11c is disposed on the back side (the side on which the adhesive layer 12 is not provided) of the polyurethane foam 11, and the self-skin 1 formed on the other side is provided.
The pressure-sensitive adhesive layer 12 may be provided on 1d. Alternatively, one surface of the polyurethane foam 11 may be a self-skin and the other surface may be a cell opening surface, and the pressure-sensitive adhesive layer 12 may be laminated on the cell opening surface.

As shown in FIG. 8, an uneven mat-like skin 11e is arranged on the back side of the polyurethane foam 11, and the adhesive application step or the adhesive layer forming step is performed on the cell opening face 11c on the other side. Pressure-sensitive adhesive layer 12 may be provided. The unevenness of the mat-like skin 11e can be formed by transferring the unevenness of a release liner such as release paper used when foaming the polyurethane foam 11. In addition, both the front and back surfaces of the polyurethane foam 11 may be self-skins, and the pressure-sensitive adhesive layer 12 may be laminated on one self-skin.

The polyurethane-based pressure-sensitive adhesive layer 12 has a property of not easily adhering to the cell opening surface 11c and the matte skin 11e.
If the polyurethane-based pressure-sensitive adhesive layer 12 is wound on a roll (see FIG. 9) so as to overlap with 1e, blocking can be prevented without using the release liner 13. That is, the release liner 13 can be omitted.

Depending on the application, the sheet-like polyurethane foam 11 may have a self-skin on both the front and back surfaces, and the polyurethane-based pressure-sensitive adhesive layer 12 may be laminated on one of the self-skins. The polyurethane-based pressure-sensitive adhesive layer 12 can exhibit good lamination strength with respect to the self-skin of the polyurethane foam 11.

In the pressure-sensitive adhesive foam body 10 of each of the above embodiments, a release liner 13 may be laminated on the pressure-sensitive adhesive layer 12 and wound into a roll as shown in FIG. In this way, blocking can be more completely prevented. [Example 1] As a foam, a density of 0.03 g / cm
^Using a sliced product (thickness: 10 mm) of the flexible slab polyurethane foam of No. 3 and a compound shown in Table 1 as a urethane-based pressure-sensitive adhesive, a foam body with a pressure-sensitive adhesive was produced by a lamination method shown in FIG. With respect to the adhesive, the mixture was stirred at a liquid temperature of 25 ° C., coated with a knife coater at a rate of 60 g / m ² on a paper separator, immediately laminated with the foam, and then heated in an oven at 100 ° C. Cure for 20 minutes and cure.

The thus-obtained foam with pressure-sensitive adhesive is weakly tacky and has a 90 ° peel strength of about 200 to 300 g / g.
25 mm, the adhesive was firmly laminated to the foam, and could not be peeled off.

[0043]

[Table 1] Example 2 Asphalt 60% as a foam body
A polyurethane foam sliced product (thickness: 10 mm) having a density of 0.10 g / cm ³ was used. Other than that is the same as the first embodiment. Also in this example, the pressure-sensitive adhesive was firmly laminated to the foam body and could not be peeled off. Example 3 As a foam body, a polyether-based urethane foam having a thickness of 3 mm and having a self-skin on both sides was used. Other than that is the same as the first embodiment. Also in this example, the pressure-sensitive adhesive was firmly laminated to the foam body and could not be peeled off. Example 4 As a foam, a sliced product (thickness: 10 mm) of an EPDM open-cell foam (density: 0.10 g / cm ³ ) was used. Other than that is the same as the first embodiment. Also in this example, the pressure-sensitive adhesive was firmly laminated to the foam body and could not be peeled off. [Comparative Example] A foam with an adhesive was produced using a commercially available solvent-based acrylic adhesive having a low adhesiveness. The foam body is the same as that used in Examples 1 to 4. The adhesive used was SK Dyne 1425 (manufactured by Rayken Chemical Co., Ltd.). The production method is as follows.
An adhesive was applied using a knife coater so as to obtain m ² . Thereafter, the solvent was dried in an oven at 100 ° C. for 3 minutes, and then laminated with the foam body. The 90 ° peel strength of the obtained foam with pressure-sensitive adhesive is about 2
Although the adhesive strength was weak at 00 g / 25 mm, the pressure-sensitive adhesive layer laminated on the foam body was easily peeled off and could not be put to practical use.

[0044]

According to the foam body with the pressure-sensitive adhesive according to the first aspect, it is easy to attach and re-attach during construction.
Even when using a weakly tacky adhesive that is difficult to block even when wound into a roll without using a release liner,
Good lamination strength between the pressure-sensitive adhesive layer and the foam. For the foam body of the present invention having a weakly-adhesive pressure-sensitive adhesive layer, a release liner not subjected to silicone treatment can be used, or the release liner can be omitted.

Further, since the pressure-sensitive adhesive layer and the foam are integrated with each other by reactive bonding, a pressure-sensitive adhesive such as a double-sided pressure-sensitive adhesive tape for bonding the two can be omitted. In addition, since a highly clean polyurethane-based pressure-sensitive adhesive that does not substantially contain a silicone compound or a gas-producing component of a solvent that is harmful to electronic devices is used, it can be used in electronic devices without any problem.

According to the second aspect of the present invention, the sheet-like polyurethane foam and the polyurethane-based pressure-sensitive adhesive layer are bonded to each other with an appropriate lamination strength, and the pressure-sensitive adhesive layer and the foam body are more difficult to peel off.

According to the third aspect of the invention, in addition to the effect of the second aspect, by providing the pressure-sensitive adhesive layer on the self-skin, the laminate strength between the pressure-sensitive adhesive layer and the foam body is adjusted. Can be. Further, since both the front and back surfaces have a self-skin, both the front and back surfaces are smooth, and the waterproof sealing property and the airtightness are good.

According to the fourth aspect of the present invention, in addition to the good lamination strength between the polyurethane foam and the pressure-sensitive adhesive layer, there is a property that the matte skin does not easily adhere to the pressure-sensitive adhesive layer. Therefore, even if it rolls up like a roll without using a release liner, blocking will not easily occur.

According to the fifth aspect of the present invention, since a part of the pressure-sensitive adhesive layer bites into the cell opening surface of the polyurethane foam, the laminate strength between the polyurethane foam and the pressure-sensitive adhesive layer is further increased.

According to the sixth aspect of the present invention, in addition to the good lamination strength between the polyurethane foam and the pressure-sensitive adhesive layer, there is a property that the cell opening surface does not easily adhere to the pressure-sensitive adhesive layer. In addition, even if the film is wound into a roll without using a release liner, blocking hardly occurs.

According to the seventh aspect of the present invention, blocking can be completely prevented by winding the above-mentioned foamed body with an adhesive into a roll via a release liner.

According to the eighth aspect of the present invention, by selecting the surface condition of each of the foams with the pressure-sensitive adhesive, it is possible to prevent blocking even when wound into a roll without using a release liner. Become.

According to the manufacturing method of the ninth and tenth aspects, the process is simplified as compared with a conventional polyurethane foam having a double-sided adhesive tape attached thereto. Also,
In the case of a polyurethane foam containing poor adhesion, for example, a polyurethane foam containing polybutene, asphalt, or an organic phosphorus-based flame retardant, it was difficult to attach a double-sided adhesive tape. In the foam body with the pressure-sensitive adhesive, the pressure-sensitive adhesive layer and the foam body are integrated by reaction bonding,
Both can be reliably laminated without performing the primer treatment. And according to the manufacturing method of the present invention,
Since the liquid reactive polyurethane-based pressure-sensitive adhesive is used, it is easy to control the curing speed, and even if the curing speed is increased, the laminate strength with the foam body can be sufficiently exhibited.

[Brief description of the drawings]

FIG. 1 is a perspective view of a part of a foam body with an adhesive according to one embodiment of the present invention.

FIG. 2 is a sectional view of a part of the pressure-sensitive adhesive foam body shown in FIG.

FIG. 3 is a cross-sectional view schematically showing an enlarged part of the foam body with an adhesive shown in FIG. 2;

FIG. 4 is a sectional view conceptually showing equipment for manufacturing a foam body with an adhesive.

FIG. 5 is a cross-sectional view conceptually showing equipment for applying an adhesive layer of a foam body with an adhesive.

FIG. 6 is a cross-sectional view conceptually showing equipment for foam-forming a polyurethane foam of a foam body with an adhesive.

FIG. 7 is a cross-sectional view showing an embodiment of a foam body with an adhesive having a cell opening surface.

FIG. 8 is a sectional view showing an embodiment of a foam body with an adhesive having a matte skin.

FIG. 9 is a side view showing a state where the foam body with the adhesive is wound into a roll.

[Explanation of symbols]

 10 foam body with adhesive 11 polyurethane foam 12 adhesive layer 13 release liner

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G09F 3/02 G09F 3/02 A 3/10 3/10 B G10K 11/162 B32B 5/18 // B32B 5/18 G10K 11 / 16 A C08L 75:04

Claims (10)

[Claims] 1. A foam with a pressure-sensitive adhesive characterized by laminating a reactive polyurethane-based pressure-sensitive adhesive layer containing a polyol and an isocyanate as main components on at least one surface of the foam. 2. A foam with an adhesive according to claim 1, wherein said foam is a sheet-like polyurethane foam. 3. The foam with pressure-sensitive adhesive according to claim 2, wherein the sheet-like polyurethane foam has a self-skin on both front and back surfaces, and the polyurethane-based pressure-sensitive adhesive layer is laminated on one of the self-skins. body. 4. The adhesive according to claim 2, wherein one surface of the sheet-like polyurethane foam is a mat-like skin having irregularities, and the polyurethane-based pressure-sensitive adhesive layer is laminated on the other surface. Foam with agent. 5. The sheet-like polyurethane foam according to claim 1, wherein one surface of the polyurethane foam is a self-skin and the other surface is a cell opening surface, and the polyurethane-based pressure-sensitive adhesive layer is laminated on the cell opening surface. The foam with an adhesive according to claim 2. 6. The sheet-like polyurethane foam has one surface serving as a self-skin and the other surface serving as a cell opening surface, and the polyurethane-based pressure-sensitive adhesive layer is laminated on the self-skin. The foam with an adhesive according to claim 2. 7. The pressure-sensitive adhesive foam according to claim 1, wherein a release liner is laminated on the pressure-sensitive adhesive layer and wound into a roll via the release liner. 8. The pressure-sensitive adhesive layer is wound into a roll without providing a release liner.
The foam with an adhesive according to any one of the above. 9. A step of foam-forming a foam body; a step of coating a liquid reactive polyurethane-based pressure-sensitive adhesive layer containing a polyol and an isocyanate as a main component on a release liner; A step of laminating the foam when the mold-type polyurethane-based pressure-sensitive adhesive layer is in an uncured state. 10. A step of coating and curing a liquid reactive polyurethane-based pressure-sensitive adhesive layer containing a polyol and an isocyanate as main components on a release liner, and comprising a polyol and an isocyanate as main components on the pressure-sensitive adhesive layer. A step of foaming and molding a sheet-like polyurethane foam by coating and foaming a urethane stock solution to be produced, and laminating the polyurethane foam to the pressure-sensitive adhesive layer. Method.