JP2022045461A - Laminated product and vehicle interior material - Google Patents

Abstract

To solve a problem in which constituent members such as a foam body can be easily disassembled or removed without destroying the same in various laminated products.SOLUTION: A laminated product 10 comprises: a foam body 11; and a photo-peelable adhesive layer 12 that is provided on at least one surface of the foam body 11 and that can be peeled off by light irradiation.SELECTED DRAWING: Figure 1

Description

The present invention relates to a laminated product including a foam or the like, and a vehicle interior material.

Foams are used in various fields such as in-vehicle applications, electronic devices, consumer devices, and housing building materials. In each field, the foam is often adhered to the adherend by an adhesive or the like (see, for example, Patent Document 1). When the foam is removed from the adherend after use, it is generally peeled off and discarded while being destroyed because of its low mechanical strength.
Further, in recent years, foams, resin films and the like are often combined with different materials and used as laminated products (see, for example, Patent Document 2). In laminated products, different materials are generally bonded to each other by an adhesive, but it is often difficult to separate each material.

Japanese Unexamined Patent Publication No. 2019-183142 WO2018 / 182010

In recent years, from the viewpoint of environmental consideration, there has been a demand to sort different materials by material for recycling. In addition, with the spread of car sharing and the like, one vehicle is often shared by an unspecified number of people, and along with this, there is a demand for vehicle interior materials to be replaced on a regular basis. Therefore, it is desired that various materials such as foams and resin films can be easily disassembled without being destroyed, and can be easily removed.

Therefore, it is an object of the present invention to make it possible to easily disassemble or remove various laminated products and vehicle interior materials without destroying constituent members such as foams.

The gist of the present invention is as follows [1] to [12].
[1] Foam and
A laminated product provided on one surface of the foam and provided with a light or heat-removable adhesive layer that can be peeled off by light irradiation or heating.
[2] A light peeling type adhesive layer that can be peeled off by light irradiation is provided.
The laminated product according to the above [1], wherein the foam has light transmittance.
[3] The laminated product according to the above [2], wherein the light peeling type adhesive layer can be peeled off by irradiation with ultraviolet rays.
[4] Further provided with a first base material and a first adhesive layer,
The laminate according to the above [2] or [3], wherein at least the photo-peelable adhesive layer, the first base material, the first adhesive layer, and the foam are provided in this order.
[5] A heat-peeling adhesive layer that can be peeled off by heating and a surface layer are further provided.
The laminated product according to any one of the above [1] to [4], which is provided in the order of the light peeling type adhesive layer, the foam, the heat peeling type adhesive layer, and the surface layer.
[6] The laminated product according to the above [5], wherein the surface layer is at least one selected from the group consisting of a resin layer, a cloth, leather, and a metal layer.
[7] Further provided with a second base material and a second adhesive layer,
The above [5] or [5] or [the above-mentioned [5] or [ 6] The laminated product.
[8] The first layer constituting a part of the vehicle interior material and
A vehicle interior material provided on at least one surface of the first layer and provided with a light or heat-removable adhesive layer that can be peeled off by light irradiation or heating.
[9] The vehicle interior material according to the above [8], wherein the first layer is at least one selected from the group consisting of a foam, a resin layer, a fabric, a leather, and a metal layer.
[10] A light peeling type adhesive layer that can be peeled off by light irradiation is provided.
The vehicle interior material according to the above [8] or [9], wherein the first layer has light transmission.
[11] A heat-peeling adhesive layer that can be peeled off by heating and a second layer that constitutes a part of the vehicle interior material are further provided.
The first layer has light transmission and is
The vehicle interior material according to the above [10], wherein at least the light peeling type adhesive layer, the first layer, the heat peeling type adhesive layer, and the second layer are provided in this order.
[12] The first layer is a foam, and the first layer is a foam.
The vehicle interior material according to the above [11], wherein the second layer comprises at least one selected from the group consisting of a resin layer, a decorative layer, a cloth, leather, and a metal.

In the present invention, the laminated product and the vehicle interior material can be easily removed or disassembled without damaging the constituent members such as the foam.

It is a schematic sectional drawing which shows the laminated product which concerns on 1st Embodiment. It is a schematic sectional drawing which shows the laminated product which concerns on 2nd Embodiment. It is a schematic sectional drawing which shows the laminated product which concerns on 3rd Embodiment. It is a schematic sectional drawing which shows the laminated product which concerns on 4th Embodiment. It is a schematic sectional drawing which shows the vehicle interior material which concerns on 5th Embodiment. It is a schematic sectional drawing which shows the vehicle interior material which concerns on 6th Embodiment. It is a schematic sectional drawing which shows the vehicle interior material which concerns on 7th Embodiment. It is a schematic sectional drawing which shows the vehicle interior material which concerns on 8th Embodiment.

Hereinafter, the present invention will be described in detail with reference to the embodiments.
<First Embodiment>
FIG. 1 shows a laminated product 10 according to the first embodiment. The laminated product 10 includes a foam 11 and a photo-peelable adhesive layer 12 provided on one surface of the foam 11 and which can be peeled off by light irradiation.

[Foam]
The foam 11 is a resin foam, which is obtained by foaming the resin. As the resin used for the foam 11, any resin that can be used for the foam can be used without limitation, such as polyvinyl chloride resin, silicone resin, acrylic resin, polyurethane resin, polyolefin resin, and elastomer. Can be mentioned. These may be used alone or in combination of two or more.
Among these, a polyolefin-based foam containing a polyolefin-based resin is more preferable.
The foam may be composed of a single foam layer, or may be a multi-layered foam in which two or more foam layers are laminated. The individual foams constituting the multi-layered foam layer may have different physical characteristics such as composition, thickness, expansion ratio, and degree of cross-linking.

(Optical transparency)
The foam 11 preferably has light transmission. Since the foam 11 has light transmission property, when light is irradiated from the foam 11 side, the light passes through the foam and is also irradiated with the light peeling type adhesive layer 12, and the light peeling type adhesive layer 12 is irradiated. It can be peeled off.
As will be described later, the photo-peelable adhesive layer 12 can be peeled off by being irradiated with light having a predetermined wavelength, and more preferably by being irradiated with ultraviolet rays. Therefore, it is preferable that the foam 11 can transmit light having the above-mentioned predetermined wavelength, and more preferably it can transmit ultraviolet rays.

The ultraviolet transmittance of the foam 11 may be, for example, 0.1% or more, but is preferably 3% or more, preferably 5% or more so that the light-peelable adhesive layer 12 can be peeled off by a small amount of ultraviolet irradiation. Is more preferable. The ultraviolet transmittance of the foam is not particularly limited with respect to the upper limit thereof, but is, for example, 90% or less.
The ultraviolet transmittance is, for example, the ultraviolet transmittance at a wavelength of 365 nm, and can be measured by, for example, a spectrophotometer.

(Thickness)
The thickness of the foam is, for example, 0.01 to 100 mm. By setting the thickness of the foam to 0.01 mm or more, it becomes easy to exhibit various performances required for the foam such as cushioning property, shock absorption, tactile sensation (soft feeling), and flexibility. Further, when the thickness is 100 mm or less, it becomes easy to secure the above-mentioned light transmission. From these viewpoints, the thickness of the foam is preferably 0.1 to 50 mm, more preferably 0.5 to 20 mm.

(Effervescence magnification)
The foaming ratio of the foam is, for example, 1.2 to 100 times. When the foaming ratio is 1.2 times or more, it becomes easy to exhibit various performances required for the foam such as cushioning property, shock absorption, tactile sensation, and flexibility. In addition, it becomes easy to secure light transmission. Further, by setting the value to 100 times or less, it is possible to impart certain mechanical properties to the foam and prevent it from being damaged when the laminated product 10 is peeled off. From these viewpoints, the foaming ratio of the foam is preferably 2 to 50 times, more preferably 4 to 25 times.
The foaming ratio is determined by measuring the specific volume of the resin composition before foaming and the specific volume after foaming (unit: cm ³ / g), and by (specific volume of foam) / (specific volume of resin composition before foaming). It should be calculated.

(Crosslink degree (gel fraction))
The foam may be crosslinked. The foam is preferably crosslinked, for example, in the case of a polyolefin-based foam. The degree of cross-linking (gel fraction) of the foam is preferably 3 to 70% by mass. When the gel fraction is at least the above lower limit value, sufficient cross-linking is formed in the foam, so that the mechanical strength tends to be high, and damage at the time of peeling can be prevented. Further, when the degree of cross-linking is not more than the upper limit value, it becomes easy to improve cushioning property, shock absorption, tactile sensation, flexibility and the like. From such a viewpoint, the degree of cross-linking is more preferably 5 to 65% by mass, further preferably 10 to 60% by mass. The degree of cross-linking can be measured by the following measuring method.

<Measurement method>
About 100 mg of a test piece was collected from the foam, and the weight A (mg) of the test piece was precisely weighed. Next, this test piece was immersed in 30 cm ³ of xylene at 120 ° C. and left for 24 hours, then filtered through a 200 mesh wire mesh to collect the insoluble matter on the wire mesh, vacuum dried, and the weight of the insoluble matter. B (mg) was precisely weighed. From the obtained values, the degree of cross-linking (mass%) was calculated by the following formula.
Degree of cross-linking (% by mass) = (B / A) x 100

(Closed cell ratio)
The foam may be a closed cell type, an open cell type, or a semi-closed cell type. The closed cell type means that the bubbles contained in the foam are generally closed cells, and for example, the closed cell ratio is 70% or more. For example, in the case of a polyolefin-based foam, the foam is preferably a polyolefin-based foam, and the closed cell ratio is preferably 80% or more, preferably 90% or more.
Further, the open cell type means that the bubbles contained in the foam are generally closed cells, and here, the closed cell ratio is less than 50%, and the semi-closed cell type has a closed cell ratio. 50% or more and less than 80%.
The closed cell ratio can be measured according to, for example, ASTM D2856 (1998).

(Polyolefin resin)
Examples of the polyolefin resin used for the polyolefin-based foam include polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer and the like.
The polyethylene resin includes low density polyethylene resin (density 0.93 g / cm ³ or less, LDPE), medium density polyethylene resin (density greater than 0.930 g / cm ³ and less than 0.942 g / cm ³ , MDPE), and high density polyethylene resin. Density Polyethylene resin (density 0.942 g / cm ³ or more, HDPE) and the like can be mentioned. Further, the polyethylene resin may be a linear low density polyethylene resin (density 0.93 g / cm ³ or less, LLDPE).

The polyethylene resin may be a homopolymer of ethylene, but a copolymer of ethylene and a small amount of α-olefin containing ethylene as a main component (preferably 75% by mass or more, more preferably 90% by mass or more of all the monomers) or the like. But it may be. The linear low-density polyethylene resin is preferably a copolymer of ethylene and a small amount of α-olefin.
Examples of the α-olefin include those having 3 to 12 carbon atoms, more preferably 4 to 10 carbon atoms, and specifically, 1-butene, 1-pentene, 1-hexene and 4-methyl-1. -Pentene, 1-heptene, 1-octene and the like can be mentioned. In the copolymer, these α-olefins can be used alone or in combination of two or more.
Further, the polyethylene resin may be used alone or in combination of two or more.

The polypropylene resin may be homopolypropylene, which is a homopolymer of propylene, or propylene and a small amount of ethylene containing propylene as a main component (preferably 75% by mass or more, more preferably 90% by mass or more of all the monomers). Examples thereof include a copolymer with α-olefin other than propylene.
Examples of the copolymer of propylene and α-olefin other than ethylene and propylene include block copolymers (block polypropylene), random copolymers (random polypropylene), and random block copolymers.
Examples of α-olefins other than propylene include α-olefins having 4 to 10 carbon atoms such as 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, and 1-octene. Among these, ethylene is preferable from the viewpoint of moldability and heat resistance. In the copolymer, these α-olefins can be used alone or in combination of two or more.
Further, the polypropylene resin may be used alone or in combination of two or more.

Examples of the ethylene-vinyl acetate copolymer used as the polyolefin resin include an ethylene-vinyl acetate copolymer containing 50% by mass or more of a structural unit derived from ethylene. Since the ethylene-vinyl acetate copolymer has high compatibility with the polyethylene resin and the polypropylene resin, the ethylene-vinyl acetate copolymer can be used in combination with one or more selected from the polyethylene resin and the polypropylene resin.

The polyolefin-based foam may be composed of only the above-mentioned polyolefin resin as a resin component, but may contain other resin components such as an elastomer. The content of the polyolefin resin in the polyolefin-based foam is preferably 50% by mass or more, more preferably 70% by mass or more, still more preferably 90% by mass or more, based on the total amount of the foam.

(Effervescent agent)
The foam 11 may be formed by foaming with a foaming agent. The foaming agent may be a physical foaming agent, heat-expandable fine particles, or a chemical foaming agent. The foaming agent may be used in combination of two types, for example, a heat-expandable fine particle and a chemical foaming agent may be used in combination.
The physical foaming agent is not particularly limited as long as it is inert to the resin composition and can be impregnated, and examples thereof include carbon dioxide, butane gas, nitrogen gas, and air.

As the heat-expandable fine particles, heat-expandable microcapsules can be preferably used. Examples of the heat-expandable microcapsules include microspheres in which a substance such as isobutane, propane, and pentane that is easily gasified and expanded by heating is contained in an elastic shell. The shell is often formed of a heat-meltable substance or a substance that is destroyed by thermal expansion. Examples of the substance forming the shell include vinylidene chloride-acrylonitrile copolymer, polyvinyl alcohol, polyvinyl butyral, polymethylmethacrylate, polyacrylonitrile, polyvinylidene chloride, polysulfone and the like.

As the chemical foaming agent, a pyrolytic foaming agent is preferable. As the pyrolysis type foaming agent, an organic foaming agent and an inorganic foaming agent can be used, but an organic foaming agent is preferable. Examples of the organic foaming agent include azodicarbonamide, azodicarboxylic acid metal salt (azodicarboxylic acid barium, etc.), azo compounds such as azobisisobutyronitrile, nitroso compounds such as N, N'-dinitrosopentamethylenetetramine, and hydrazine. Examples thereof include zodicarbonamides, 4,4'-oxybis (benzenesulfonyl hydrazide), hydrazine derivatives such as toluenesulfonyl hydrazide, and semicarbazide compounds such as toluenesulfonyl semicarbazide.
Examples of the inorganic foaming agent include ammonium carbonate, sodium carbonate, ammonium hydrogencarbonate, sodium hydrogencarbonate, ammonium nitrite, sodium boron hydride, anhydrous monosoda citrate and the like.
Among the above, the pyrolytic foaming agent is preferably an azo compound, and more preferably an azodicarbonamide, from the viewpoint of obtaining fine bubbles, economy, and safety.
One type of pyrolysis foaming agent may be used alone, or two or more types may be used in combination.

When a physical foaming agent is used, it may be foamed by impregnating a resin composition containing a resin component, an additive to be blended if necessary, and the like with the foaming agent.
When a chemical foaming agent or heat-expandable fine particles are used, the foam can be produced by foaming a resin composition containing, for example, a resin and a foaming agent. Further, for example, in the case of a polyolefin-based foam, a resin composition containing a resin such as a polyolefin-based resin and a pyrolysis-type foaming agent is prepared, and the resin composition is irradiated with ionizing radiation as necessary. It is preferable that the resin is obtained by cross-linking and then foaming by heating.
In the case of a polyurethane resin foam, it is formed by reacting and foaming a resin composition containing a polyol compound, a polyisocyanate compound, and a foaming agent. The polyol compound and the polyisocyanate compound react and cure to become a polyurethane resin.

In addition to resins and foaming agents, resin compositions for obtaining foams include nucleating agents, cross-linking aids, decomposition temperature regulators, antioxidants, heat stabilizers, colorants, flame retardants, and antistatic agents. , Additives generally used for foams such as fillers (eg, heat conductive fillers, etc.) may be blended.

[Light peeling type adhesive layer]
The photo-peelable adhesive layer 12 is made of an adhesive and can be peeled off by being irradiated with light. One surface of the light-release adhesive layer 12 is an adhesive surface for adhering to the foam 11, and the other surface is an adhesive surface for adhering to the adherend.
The laminated product 10 can be attached to various adherends by the photo-peelable adhesive layer 12, and the adhesive force to the adherend is reduced by irradiation with light after the attachment, so that the adherend is attached. It can be peeled off from. It is preferable that the light peeling type adhesive layer 12 has a reduced adhesive strength and can be peeled off by irradiation with light having a predetermined wavelength, but it is preferable that the adhesive strength is lowered and the photo-peelable adhesive layer 12 can be peeled off by irradiation with ultraviolet rays. If it can be peeled off by ultraviolet rays, the light peeling type adhesive layer 12 can be efficiently peeled off with a simple device. Further, when the laminated product 10 is used by being attached to an adherend, the laminated product 10 is generally not irradiated with ultraviolet rays, so that the adhesive strength of the photo-peelable adhesive layer 12 is lowered by the ultraviolet irradiation during use. Therefore, it can be prevented from peeling off.

The adhesive constituting the photo-peelable adhesive layer 12 contains, for example, a photo-curable component, and the photo-curable component is cured by irradiating it with light of a predetermined wavelength, preferably ultraviolet rays, thereby photo-peeling. Examples thereof include those that increase the elastic coefficient of the mold adhesive layer 12 to reduce the adhesive force and enable peeling.
Further, as the light peeling type adhesive layer 12, for example, an adhesive containing a gas generating agent that generates a gas by irradiating light having a predetermined wavelength, preferably ultraviolet rays, can also be used. When the light peeling type adhesive layer 12 contains a gas generating agent, gas is generated from the gas generating agent by light irradiation, and at least a part of the adhesive surface with the adherend is peeled off by the generated gas to increase the adhesive force. It can be lowered and peeled off.
Further, the photo-peeling type adhesive layer 12 may be composed of an adhesive containing both a photocurable component and a gas generating agent that generates a gas by light irradiation. When both of these are contained, the elastic modulus of the entire photo-peelable adhesive layer increases due to the curing of the photocurable component, and at least a part of the adhesive surface with the adherend is peeled off by the gas generated from the gas generating agent. As a result, the adhesive strength is more likely to decrease.

The photocurable component may be one that is cured by being irradiated with light having a predetermined wavelength, but is preferably an ultraviolet curable type that is cured by ultraviolet irradiation. Similarly, the gas generating agent may be any one that generates a gas by being irradiated with light having a predetermined wavelength, but a gas generating agent that generates a gas by irradiation with ultraviolet rays is preferable.

The adhesive constituting the photo-peelable adhesive layer 12 is preferably made of an adhesive. The pressure-sensitive adhesive is a pressure-sensitive adhesive, and can be adhered to the adherend by contacting the adherend and applying pressure.
Examples of the pressure-sensitive adhesive constituting the photo-peelable adhesive layer 12 include an acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a vinyl alkyl ether-based pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, and a polyamide-based pressure-sensitive adhesive. Examples thereof include agents, fluorine-based pressure-sensitive adhesives, and styrene-diene block copolymerization-based pressure-sensitive adhesives. Therefore, the pressure-sensitive adhesive may be any one of acrylic resin, urethane resin, silicone resin, rubber component, vinyl alkyl ether resin, polyester resin, polyamide resin, fluororesin, and styrene-diene block copolymer. It may be included as a base polymer.
Among these, rubber-based adhesives and acrylic-based adhesives are preferable, and acrylic-based adhesives are more preferable. Therefore, the pressure-sensitive adhesive preferably contains a rubber component or an acrylic resin, and more preferably contains an acrylic resin. As the acrylic resin, for example, a resin having a weight average molecular weight of about 200,000 to 2,000,000 may be used.
The weight average molecular weight is a polystyrene-equivalent value measured by gel permeation chromatography (GPC) measurement.

Examples of the acrylic resin include (meth) acrylic acid alkyl ester-based polymers, for example, a polymer of (meth) acrylic acid alkyl ester, or a (meth) acrylic acid alkyl ester, and a functional group-containing monomer. Examples thereof include acrylic polymers having a functional group such as a copolymer.
The (meth) acrylic acid alkyl ester is, for example, a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 18 carbon atoms, and preferably contains a (meth) acrylic acid alkyl ester having an alkyl group having 5 or less carbon atoms. ..
Examples of the functional group-containing monomer include carboxyl group-containing monomers such as acrylic acid and methacrylic acid, hydroxyl group-containing monomers such as hydroxyethyl (meth) acrylate and hydroxyethyl methacrylate, and glycidyl (meth) acrylate. Examples thereof include an epoxy group-containing monomer, an isocyanate group-containing monomer such as (meth) acrylate ethyl isocyanate, and an amino group-containing monomer such as aminoethyl acrylate and aminoethyl methacrylate.

When the pressure-sensitive adhesive contains a photocurable component, at least a part of the above base polymer may be a photocurable component, a photocurable component may be added as a component other than the base polymer, or the base polymer may be lightened. A photocurable component other than the base polymer may be added while making it a curable component.
For example, when the pressure-sensitive adhesive is an acrylic pressure-sensitive adhesive and the acrylic resin is a photo-curable component, at least a part of the acrylic resin may be photo-curable (preferably UV-curable). Specifically, such a photocurable acrylic resin is a compound having a functional group that reacts with the functional group and a radically polymerizable unsaturated bond in the acrylic polymer having the above functional group (hereinafter, "" It can be obtained by reacting with a functional group-containing unsaturated compound. As the functional group-containing unsaturated compound, at least one selected from the above-mentioned functional group-containing monomers may be used.

As the functional group-containing unsaturated compound, for example, when the functional group of the acrylic polymer is a carboxyl group, an epoxy group-containing monomer or an isocyanate group-containing monomer may be used. When the functional group is a hydroxyl group, an isocyanate group-containing monomer may be used. When the functional group is an epoxy group, a carboxyl group-containing monomer or an amide group-containing monomer such as acrylamide may be used. When the functional group is an amino group, an epoxy group-containing monomer may be used.

Examples of the photocurable component as a component other than the base polymer include polyfunctional oligomers and monomers. Examples of the polyfunctional oligomer include those having a weight average molecular weight of 10,000 or less.
The polyfunctional oligomer or monomer has a plurality of radically polymerizable unsaturated bonds in the molecule, for example, the number of radically polymerizable unsaturated bonds in the molecule is 2 to 20. Examples of the polyfunctional oligomer or monomer include trimethylolpropanetri (meth) acrylate, tetramethylolmethanetetra (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, and dipentaerythritol monohydroxypenta. (Meta) acrylate, dipentaerythritol hexa (meth) acrylate, 1,4-butylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, polyethylene glycol di (meth) acrylate, commercially available oligoester Examples thereof include (meth) acrylate.
Further, the polyfunctional oligomer or monomer is more preferably used in combination with the above-mentioned photopolymerizable acrylic resin.

The gas generating agent used for the photo-peeling adhesive layer is not particularly limited, and examples thereof include an azide compound and an azo compound. Azide compounds and azo compounds generate nitrogen gas when stimulated by light, for example, ultraviolet rays. As the gas generator, an azide compound having excellent heat resistance is suitable.
The azide compound is not particularly limited, and is, for example, 3-azidomethyl-3-methyloxetane, terephthalazide, p-tert-butylbenzazide, 3-azidomethyl-3.
-Glysidyl azide polymer (GA) obtained by ring-opening polymerization of methyloxetane.
Examples thereof include polymers having an azido group such as P).

When the adhesive contains a photopolymerizable component, it preferably contains a photopolymerization initiator. When the adhesive is a pressure-sensitive adhesive, the pressure-sensitive adhesive may contain a pressure-sensitive adhesive resin in addition to the base polymer.
Further, the adhesive used for the photo-peeling adhesive layer 12 may further contain various additives used for the adhesive, the pressure-sensitive adhesive, and the like, and may be further blended with, for example, a cross-linking agent, an antioxidant, and an antioxidant. , Plasticizers, resins, surfactants, waxes, fine particle fillers and other known additives may be contained.

As the adhesive used for the light peeling type adhesive layer 12, a gas is used that generates or cures gas by light irradiation and thereby reduces the adhesive strength, but the adhesive strength is increased by light irradiation. As long as it is reduced, the adhesive strength may be reduced by other configurations.
Further, known adhesives can also be used, and for example, the adhesives described in Japanese Patent No. 3566710, Japanese Patent No. 4238037, Japanese Patent No. 4653859, and the like may be used. Further, "ultraviolet curable adhesive LC-3200" manufactured by 3M Ltd. can also be used.

The thickness of the light-release adhesive layer 12 is not particularly limited, but is, for example, 30 to 300 μm, preferably 50 to 200 μm. When the thickness of the light-release adhesive layer is within the above range, an appropriate adhesive force can be ensured.

In the laminated product 10, a release sheet (not shown) or the like may be attached to the surface (adhesive surface) of the light release type adhesive layer 12. By attaching the release sheet to the laminated product 10, it becomes possible to protect the surface (adhesive surface) of the light release type adhesive layer 12. As the release sheet, a known release sheet can be used, and for example, a release sheet on which at least one surface of a base material such as a resin film or paper has been peeled can be used. When the release sheet is attached to the laminated product 10, the release sheet may be peeled off at the time of use. Further, the laminated product 10 may be in a wound state. The wound laminated product 10 can be used by feeding it out at the time of use.

[how to use]
The laminated product 10 in the present embodiment can be used by being attached to various adherends. The adherend is not particularly limited, but various vehicles such as automobiles, two-wheeled vehicles, railroad vehicles, transportation equipment other than vehicles such as ships and airplanes, electronic equipment, electric appliances, furniture, stationery, and various buildings such as building materials for housing. Things and the like can be mentioned. Among these, it is preferably used for vehicles, electronic devices, and electrical appliances.

The laminated product 10 attached to the adherend may be removed from the adherend after use, for example. In the present embodiment, the laminated product 10 may be peeled off from the adherend after irradiating the light peeling type adhesive layer 12 with light. At this time, the light is preferably emitted from the foam 11 side, but if the adherend has light transmission, the light may be irradiated from the adherend side. The light used is preferably ultraviolet light as described above. The irradiation dose of ultraviolet rays to the light-release adhesive layer 12 is not particularly limited, but may be, for example, 500 mJ / cm ² or more, and the wavelength of ultraviolet rays may be selected from, for example, 200 to 410 nm.
When the light-peelable adhesive layer 12 is irradiated with light, the adhesive force to the adherend is reduced and the photo-peelable adhesive layer 12 can be easily peeled off from the adherend. Therefore, the laminated product 10 can be easily removed from the adherend without damaging the adherend or the foam 11. Therefore, it becomes easy to separate each material, and it becomes easy to recycle the foam 11.

Further, when the light peeling type adhesive layer 12 is irradiated with light, not only the adhesive force to the adherend but also the adhesive force to the foam 11 is lowered. Therefore, the foam 11 may be peeled off from the photo-peeling adhesive layer 12 when the laminated product 10 is removed from the adherend. By peeling the foam 11 from the light-release adhesive layer 12, the separation of each material is further promoted, and the foam 11 and the light-release adhesive layer 12 can be easily recycled.
When the foam 11 can be peeled from the light peeling adhesive layer 12, the peeling order of each layer when the laminated product 10 is removed from the adherend is not particularly limited, but the foam 11 is peeled from the light peeling adhesive layer 12. After peeling, the light peeling type adhesive layer 12 may be peeled from the adherend. Further, after the laminate of the light-release adhesive layer 12 and the foam 11 is peeled from the adherend, the foam 11 may be peeled from the light-release adhesive layer 12.

<Second embodiment>
FIG. 2 shows the laminated product 15 according to the second embodiment. The laminated product 10 includes a foam 11 and a heat-removable adhesive layer 17 provided on one surface of the foam 11 and which can be peeled off by heating. That is, this embodiment is different from the first embodiment in that a heat-peeling adhesive layer is used as the peeling adhesive layer instead of the photo-peeling adhesive layer. Hereinafter, the second embodiment will be described mainly on the differences from the first embodiment, and the description thereof will be omitted in the same configuration as the first embodiment.

[Foam]
In the second embodiment, the foam 11 is the same as the foam in the first embodiment described above. However, in the second embodiment, the foam 11 does not have to have light transmittance, and the ultraviolet transmittance of the foam 11 does not have to be within the range shown above.

[Heat peeling adhesive layer]
The heat-removable adhesive layer 17 is made of an adhesive and can be peeled off by being heated. The laminated product 15 can be attached to various adherends via the heat-removable adhesive layer 17, and the adherend is heated after being attached to reduce the adhesive force to the adherend. It can be peeled off from.
When the heat-removable adhesive layer 17 is heated to, for example, 85 to 210 ° C., the adhesive strength is reduced and the heat-removable adhesive layer 17 can be peeled off from the adherend. By heating to 85 ° C. or higher and allowing the laminate to be peeled off, it is possible to prevent the laminated product 15 from being unexpectedly peeled off from the adherend under normal use environment. Further, when the temperature is 210 ° C. or lower, the workability when peeling the laminated product 15 from the adherend is improved. From these viewpoints, the heat-removable adhesive layer 17 can be peeled off by being heated to preferably 90 to 200 ° C., more preferably 100 ° C. to 170 ° C.

The heat-peeling adhesive layer 17 is preferably made of an adhesive. The type of the pressure-sensitive adhesive is as described in the first embodiment, and the usable base polymer is the same as that in the first embodiment. Among the above, the pressure-sensitive adhesive in the second embodiment is preferably a rubber-based pressure-sensitive adhesive or an acrylic-based pressure-sensitive adhesive, and more preferably an acrylic-based pressure-sensitive adhesive. Therefore, the pressure-sensitive adhesive preferably contains a rubber component and an acrylic resin, and more preferably contains an acrylic resin. As the acrylic resin, for example, a resin having a weight average molecular weight of about 200,000 to 2,000,000 may be used.
Examples of the acrylic resin include (meth) acrylic acid alkyl ester-based polymers, for example, a polymer of (meth) acrylic acid alkyl ester, or a (meth) acrylic acid alkyl ester, and a functional group-containing monomer. Examples thereof include acrylic polymers having a functional group such as a copolymer. Details of the (meth) acrylic acid alkyl ester and the functional group-containing monomer are as described above.

The heat-release adhesive layer 17 preferably contains a foaming agent in addition to the base polymer. The foaming agent may be a foaming agent that foams by heating. When the heat-peelable adhesive layer 17 has a foaming agent, the foaming agent foams when heated, and the adhesive area with respect to an adherend or the like is reduced, whereby the adhesive strength is reduced and the adhesive layer 17 can be peeled off. ..

Examples of the foaming agent include either heat-expandable fine particles or chemical foaming agents, and among them, heat-expandable fine particles are preferable. As the heat-expandable fine particles, heat-expandable microcapsules can be preferably used. Further, as the chemical foaming agent, a pyrolysis type foaming agent is preferable. As the pyrolysis type foaming agent, an organic foaming agent and an inorganic foaming agent can be used, but an organic foaming agent is preferable. Details of the heat-expandable microcapsules and the organic foaming agent and the inorganic foaming agent are as described above.

The foaming start temperature of the foaming agent used for the heat-release adhesive layer 17 is, for example, 85 to 210 ° C, preferably 90 to 200 ° C, and more preferably 100 ° C to 170 ° C.
The foaming start temperature means the expansion start temperature in the case of thermally expandable fine particles. The measurement of the expansion start temperature can be performed using, for example, a thermomechanical analyzer (TMA). That is, a predetermined sample is placed in an aluminum container or the like, and a force of 0.1 N is applied from above, and the sample is heated from 80 ° C. to 220 ° C. at a heating rate of 5 ° C./min. It is preferable to measure the displacement of the measurement terminal in the vertical direction in this state and set the temperature at which the displacement starts to increase as the expansion start temperature.
The foaming start temperature means the decomposition start temperature in the case of a chemical foaming agent, and is from 80 ° C. to 300 ° C. at a heating rate of, for example, 2 ° C./min using a differential thermal weight simultaneous measuring device (TG / DTA). It is advisable to heat and draw a weight reduction curve, and set the turning point in the curve as the foaming start temperature.

The content of the foaming agent such as the heat-expandable fine particles is not particularly limited as long as the heat-releaseable adhesive layer 17 can be peeled off by heating, but is preferably 1 to 150 parts by mass with respect to 10 parts by mass of the base polymer. Is 10 to 130 parts by mass, more preferably 25 to 100 parts by mass.

When the adhesive is a pressure-sensitive adhesive, the pressure-sensitive adhesive may contain a pressure-sensitive adhesive resin in addition to the base polymer. Further, the adhesive such as the pressure-sensitive adhesive used for the heat-release type adhesive layer 17 may further contain an adhesive or various additives used for the pressure-sensitive adhesive, for example, a cross-linking agent, an antioxidant, and the like. It may contain known additives such as antistatic agents, plasticizers, resins, surfactants, waxes and fine particle fillers.
As the adhesive used for the heat-release type adhesive layer 17, the foaming agent foams by heating, thereby reducing the adhesive strength. However, as long as the adhesive strength is reduced by heating, the foaming agent is used. The adhesive strength may be lowered by other than the above. For example, the heat-removable adhesive layer 17 may be cured by heating to increase the elastic modulus to reduce the adhesive force.

The thickness of the heat-release adhesive layer 17 is not particularly limited, but is, for example, 30 to 300 μm, preferably 50 to 200 μm. When the thickness of the light-release adhesive layer is within the above range, an appropriate adhesive force can be ensured.

The laminated product in this embodiment can be used by being attached to various adherends. The details of the adherend are as described in the first embodiment. The laminated product 15 attached to the adherend is removed from the adherend after use, for example. In the present embodiment, the laminated product 15 may be removed from the adherend after heating the heat-removable adhesive layer 17. At this time, the laminated product 15 may be heated from the foam 11 side or the adherend side, but it is preferable to heat from the foam 11 side. The method for heating the laminated product 15 is not particularly limited, and examples thereof include a method of blowing hot air, a method of heating by radiant heat, a method of bringing a heater into contact with a foam or an adherend, and heating by heat transfer.
The heat-removable adhesive layer 17 is preferably heated to a temperature at which the adhesive strength is reduced and can be peeled off. For example, the temperature is 85 to 210 ° C., preferably 90 to 200 ° C., more preferably 100 ° C. to 170 ° C. Be heated.

When the heat-removable adhesive layer 17 is heated, the adhesive force to the adherend is reduced and the heat-peelable adhesive layer 17 can be easily peeled off from the adherend. Therefore, as in the first embodiment, the laminated product 15 can be removed from the adherend without damaging the adherend or the foam 11. Therefore, it becomes easy to separate each material, and it becomes easy to recycle the foam 11.
Further, when the heat-removable adhesive layer 17 is heated, not only the adhesive force to the adherend but also the adhesive force to the foam 11 decreases, so that the foam 11 is heated as in the first embodiment. It may be peeled off from the peelable adhesive layer 17.

In the above first and second embodiments, either a light peeling type or a heat peeling type may be used as the peeling type adhesive layer, but the peeling type adhesive layer can be peeled off by either heating or light irradiation. , Thermal and light peeling adhesives may be used. As such an adhesive, for example, in the first embodiment, as a gas generating agent, an adhesive that generates gas by both light irradiation and heating may be used.

The laminated products 10 and 15 in the first and second embodiments can be manufactured by laminating the light-release adhesive layer 12 or the heat-release adhesive layer 17 on the foam 11. Specifically, it may be manufactured by laminating the light-release adhesive layer 12 or the heat-release adhesive layer 17 formed on the release sheet on the foam 11.
Further, by directly applying the adhesive to the foam 11, a light-release adhesive layer 12 or a heat-release adhesive layer 17 is formed on the foam 11, thereby producing laminated products 10 and 15. You may.

<Third embodiment>
In the above first and second embodiments, one layer of the releaseable adhesive layer is provided in the laminated product, but even if a plurality of layers are provided as shown in the third embodiment below. good.
FIG. 3 shows the laminated product 20 according to the third embodiment. The third embodiment is different from the first embodiment in that the laminated product 20 also has the heat-release adhesive layer 17 and the surface layer 21 in addition to the light-release adhesive layer 12 and the foam 11. do. Hereinafter, the third embodiment will be described mainly on the differences from the first embodiment, and the description of the same configuration as that of the first embodiment will be omitted.

The laminated product 20 according to the third embodiment includes a foam 11 and a photo-peelable adhesive layer 12 provided on one surface of the foam 11. Further, a heat-release adhesive layer 17 is adhered to the other surface of the foam 11, and a surface layer 21 is laminated via the heat-release adhesive layer 17. That is, the laminated product 20 includes a light-release adhesive layer 12, a foam 11, a heat-release adhesive layer 17, and a surface layer 21, which are provided in this order.
The configurations of the foam 11, the light-release adhesive layer 12, and the heat-release adhesive layer 17 in this embodiment are the same as those in the first and second embodiments, and the description thereof will be omitted.

[Surface layer]
The surface layer 21 is used to add various functions to the laminated product 20 at the time of use, and is used, for example, to fulfill the function of a protective layer or improve the design. Examples of the surface layer 21 include a resin layer, a cloth, leather, and a metal layer. The surface layer 21 may be composed of one layer alone, or may be a laminated body having two or more layers.

The resin layer may be formed of various resins, but the resin may be an elastomer. Specifically, a polyvinyl chloride sheet, a mixed resin sheet of polyvinyl chloride and ABS resin, a polyurethane resin sheet, an acrylic resin sheet, a thermoplastic elastomer sheet, a polyolefin resin sheet, a mixed resin sheet of a polyolefin resin and a thermoplastic elastomer, etc. It should be formed. The resin layer may be a non-foaming layer.
The resin layer may be used as a protective layer for protecting the laminated product 20, or may be used as a decorative layer. In the case of a decorative layer, a decorative sheet (decorative film) may be used. Examples of the decorative sheet include a resin sheet or an elastomer sheet to which a decorative layer such as a lenticel or a wood grain pattern is applied by printing or the like.
Examples of the cloth include woven fabrics, knitted fabrics, and non-woven fabrics, and examples of leather include artificial leather and synthetic leather. Examples of the metal layer include metal foils such as aluminum, silver, gold, and copper, and metal meshes.
The resin sheet, cloth, leather, metal, and the like may be bonded to the heat-peeling adhesive layer 17 and laminated to form the surface layer 21 in the laminated product 20.

The surface layer 21 preferably has low light transmittance and low ultraviolet transmittance, and specifically, it preferably has a lower ultraviolet transmittance than the foam 11. The low light transmission makes it difficult to see the internal structure from the outside, so it is easy to improve the design. Further, the light peeling type adhesive layer 12 is irradiated with light to prevent undesired peeling of the light peeling type adhesive layer 12. Therefore, the ultraviolet transmittance of the surface layer 21 is preferably 10% or less, more preferably 2% or less, and most preferably 0%.
The thickness of the surface layer 21 is not particularly limited, but is, for example, 0.05 to 2 mm, preferably 0.3 to 1 mm.

In the present embodiment, the laminated product 20 is used by being attached to an adherend with the photo-peelable adhesive layer 12 as an adhesive surface, as in the first embodiment. Further, the laminated product 20 may be removed from the adherend after use, for example. The laminated product 20 of the present embodiment is preferably removed from the adherend by the following procedure.

First, in the laminated product 20 of the present embodiment, for example, the heat-peeling adhesive layer 17 is heated by heating from the surface layer 21 side. The details of heating are as described in the second embodiment. By this heating, the heat-removable adhesive layer 17 can be peeled off, and can be peeled off from at least one of the foam 11 and the surface layer 21. Here, which of the foam 11 and the surface layer 21 the heat-removable adhesive layer 17 can be peeled off can be adjusted by the materials of the foam 11 and the surface layer 21 and the like. That is, for example, by using a surface layer 21 whose adhesiveness to the heat-removable adhesive layer 17 does not become too high, the heat-removable adhesive layer 17 can be peeled off from the surface layer 21. The same applies to the foam 11. However, the heat-removable adhesive layer 17 may be able to be peeled off from both the foam 11 and the surface layer 21 by being heated. When the surface layer 21, the heat-removable adhesive 17, and the foam 11 can be separated from each other, the material can be separated more easily, and the foam 11, the surface layer 21, and the like can be recycled. It will be easier.

As described above, when the heat-removable adhesive layer 17 can be peeled off from the foam 11, the surface layer 21, or both by heating, first, in the laminated product 20, the surface layer 21 is peeled off. good. The surface layer 21 may be peeled off by the surface layer 21 alone, or the laminated body of the surface layer 21 and the heat-peeling adhesive layer 17 may be peeled off. Then, if necessary, the heat-released adhesive layer 17 is peeled off from the foam 11, and then light (preferably ultraviolet rays) is applied to the light-released adhesive layer 12 as in the first embodiment. It is preferable to irradiate the adhesive layer 12 with a light peelable adhesive so that the adhesive layer 12 can be peeled off and the foam 11 is removed from the adherend.

As described above, in the present embodiment, the adherend, the surface layer 21, and the foam 11 are made removable by reducing the adhesive force of the peelable adhesive layers 12 and 17 by heating and light irradiation. The surface layer 21 and the foam 11 can be easily separated and removed from the adherend without damaging the surface layer 21 and the foam 11. Therefore, not only the foam 11 but also the laminated product 20 having the surface layer 21 can be easily separated for each material, and each layer of the laminated product 20 can be easily recycled.
Further, in the present embodiment, as described above, it is possible to remove only the surface layer 21 from the foam 11 and the surface layer 21, so that, for example, the surface layer 21 is removed and the foam 11 is used as an adherend. It is also possible to leave it, and the usage of this laminated product 20 will be expanded.

In the laminated product 20 in the third embodiment, the first laminated body in which the photo-peelable adhesive layer 12 is laminated on the foam 11 is formed, and the heat-release type adhesive layer 17 is laminated on the surface layer 21. It can be manufactured by forming two laminated bodies and adhering these two laminated bodies via a heat-release type adhesive layer 17.
At this time, the first laminated body can be manufactured in the same manner as the laminated product 10 of the first embodiment. Further, the second laminate may be manufactured by laminating the heat-release adhesive layer 17 formed on the release sheet on the surface layer 21. Further, it may be obtained by directly applying an adhesive to the surface layer 21 to form a heat-release type adhesive layer 17 on the surface layer 21.
Further, the laminated product 20 in the third embodiment is not limited to the above manufacturing method, and the photothermal release type adhesive layer 12 and the heat release type adhesive layer 17 are laminated on both surfaces of the foam 11 and then. The surface layer 21 may be bonded to the heat-peeling adhesive layer 17 for production.

<Fourth Embodiment>
In the above third embodiment, the peelable adhesive layers 12 and 17 were not supported by the base material, but the peelable adhesive layers 12 and 17 were supported by the base material. You may. A specific example thereof is shown in FIG. 4 as a fourth embodiment. Hereinafter, the fourth embodiment will be described focusing on the differences from the third embodiment, and the description of the same configuration as that of the third embodiment will be omitted.

In the laminated product 25 according to the fourth embodiment, a base material (first base material 31 and second base material 32) is provided for each of the peelable adhesive layers 12 and 17, and each base material 31 is provided. , 32 has a double-sided tape structure (first double-sided tape structure 28, second double-sided tape structure 29).
Then, the first double-sided tape structure 28 is laminated on one surface of the foam 11, and the second double-sided tape structure 29 is laminated on the other surface of the foam 11, so that the first double-sided tape structure 28 is laminated. It becomes an adhesive surface to be adhered to the adherend, and the second double-sided tape structure 29 adheres the surface layer 21 to the other surface side of the foam 11.

The first double-sided tape structure 28 has a first base material 31, a light-release adhesive layer 12 adhered to one surface of the first base material 31, and the other surface of the first base material 31. The adhesive layer 33 is provided with an adhesive layer 33 to be adhered to, and the photo-peelable adhesive layer 12 constitutes an adhesive surface with an adherend, and is adhered to the foam 11 by the first adhesive layer 33.
The second double-sided tape structure 29 has a second base material 32, a heat-release adhesive layer 17 bonded to one surface of the second base material 32, and the other surface of the second base material 32. It is provided with an adhesive layer 34 to be adhered to. In the second double-sided tape structure 29, the heat-release adhesive layer 17 is adhered to the surface layer 21, and the second adhesive layer 34 is adhered to the foam 11.
With the above configuration, the laminated product 25 includes a photo-peelable adhesive layer 12, a first base material 31, an adhesive layer 33 (sometimes referred to as a first adhesive layer 33), a foam 11, and an adhesive layer. It has a laminated structure in which 34 (sometimes referred to as a second adhesive layer 34), a second base material 32, a heat-peeling adhesive layer 17, and a surface layer 21 are provided in this order.

The first and second base materials 31 and 32 are not particularly limited, and for example, plastic films such as polyethylene, polyethylene terephthalate, polypropylene and polyurethane, and cloths such as non-woven fabric can be used. The thickness of the base material is not particularly limited, but is, for example, 2 to 188 μm, preferably 12 to 50 m, from the viewpoint of ensuring a certain strength and the thinness of the double-sided tape. As will be described later, it is preferable that the first and second base materials 31 and 32 both have light transmission, and above all, ultraviolet transmission.
The first and second adhesive layers 33 and 34 may be made of an adhesive, respectively, but are preferably made of an adhesive. Adhesives include acrylic adhesives, urethane adhesives, silicone adhesives, rubber adhesives, vinyl alkyl ether adhesives, polyester adhesives, polyamide adhesives, fluorine adhesives, and styrene-diene. Block copolymerization system adhesives and the like can be mentioned.
The thickness of each of the first and second adhesive layers 33 and 34 is, for example, 10 to 200 μm, preferably 50 to 100 μm, from the viewpoint of ensuring a constant adhesive force and the thinness of the double-sided tape.
Further, it is preferable that the first and second adhesive layers 33 and 34 both have light transmittance, particularly ultraviolet ray transmission.

In this embodiment as well, as in the third embodiment, the heat-peeling adhesive layer 17 is first heated. By this heating, the heat-removable adhesive layer 17 can be peeled off, and can be peeled off from the surface layer 21 or the second base material 32. The heat-removable adhesive layer 17 is usually preferably removable from the surface layer 21, but may be removable from both the surface layer 21 and the second base material 32.
After that, the surface layer 21 may be peeled off from the second double-sided tape structure 29. Alternatively, the surface layer 21 and the heat-released adhesive layer 17 may be separated from the second base material 32 in this order as a laminate of the surface layer 21 and the heat-released adhesive layer 17.

Next, as in the third embodiment, the light-peeling adhesive layer 12 is irradiated with light (preferably ultraviolet rays) to make the light-peeling adhesive layer 12 peelable, and the foam 11 is formed. Peel off from the adherend. At this time, the foam 11 may be peeled off from the adherend together with, for example, the first double-sided tape structure 28.
Further, the light peeling type adhesive layer 12 may be peelable not only on the adherend but also on the first base material 31. As a result, the first base material 31 and the light-release adhesive layer 12 can be separated from each other.

Here, it is preferable that the light release type adhesive layer 12 is irradiated with light from the foam 11 (that is, the upper side of FIG. 4) side as in each of the above embodiments. At this time, the laminate composed of the base materials 31, 32, and the adhesive layers 33, 34 (in some cases, the heat-release type adhesive layer 17, the base materials 31, 32, and the adhesive layers 33, 34) is formed. Light is applied to the photo-peelable adhesive layer 12 through the film.
Therefore, it is preferable that the base materials 31, 32, and the adhesive layers 33, 34 constituting the first and second double-sided tape structures 28, 29 all have light transmittance, and more likely to transmit ultraviolet rays. preferable. Further, the heat-peeling adhesive layer 17 also preferably has light transmittance, and more preferably transmits ultraviolet rays. That is, it is preferable that the first and second double-sided tape structures 28 and 29 have light transmission, and more preferably ultraviolet light transmission. The same applies to the foam 11.
As a result, the laminated body consisting of the layers from the first base material 31 to the heat-release adhesive layer 17 or the laminated body consisting of the layers from the first base material 31 to the second base material 32 transmits light. It is preferable to have a property, and it is preferable to have an ultraviolet ray transmissive property.
That is, in the present invention, a laminate consisting of a layer adjacent to the photo-peeling type adhesive layer 12 (first base material 31 in FIG. 4) to the heat-peeling type adhesive layer 17 or a photo-peeling type. The laminate consisting of layers from the layer adjacent to the adhesive layer 12 to the layer adjacent to the heat-release adhesive layer 17 on the photo-peelable adhesive layer 12 side (second base material 32 in FIG. 4) is a laminate. It is preferable to have light transmission. The laminated body more preferably has ultraviolet transparency.
The ultraviolet transmittance of the laminated body may be, for example, 0.1% or more, preferably 10% or more, more preferably 20% or more, and for example, 90% or less.

Since the laminated product 25 in the present embodiment has the first and second double-sided tape structures 28 and 29, the first and second double-sided tapes corresponding to the first and second double-sided tape structures 28 and 29 are previously applied. It can be manufactured by simply stacking the first double-sided tape, the foam, the second double-sided tape, and the surface layer. As described above, the laminated product 25 has the double-sided tape structures 28 and 29, which facilitates the manufacture thereof.
As the double-sided tape, commercially available products can be used, and examples thereof include "NWS-TS322F" manufactured by Nitto Denko Corporation and "Selfa" series manufactured by Sekisui Chemical Co., Ltd.

Further, also in the present embodiment, as in the third embodiment, the surface layer 21 and the foam 11 are easily separated and adhered without damaging the adherend, the surface layer 21 and the foam 11. Since it can be removed from the body, it becomes easy to separate each material, and it becomes easy to recycle each layer of the laminated product 25.

In the fourth embodiment, the first and second adhesive layers 33 and 34 do not have to be of the light or heat peeling type. That is, the first and second adhesive layers 33 and 34 may be non-peelable adhesive layers, and it is not necessary that the adhesive force is lowered by light irradiation or heating so that the adhesive layers can be peeled off.
However, the first and second adhesive layers 33 and 34 may be of a light or heat peeling type. For example, it is preferable that the first adhesive layer 33 is a light peeling type adhesive layer and the second adhesive layer is a heat peeling type adhesive layer. That is, both adhesive layers of the first double-sided tape structure 28 may be of a light peeling type. Similarly, both adhesive layers of the second double-sided tape structure 29 may be heat-peeling type. Further, in the first double-sided tape structure 28, the first adhesive layer 33, which is a non-peelable adhesive layer, and the photo-peelable adhesive layer 12 may be interchanged, and in the second double-sided tape structure 29, The second adhesive layer 34, which is a non-peelable adhesive layer, and the heat-removable adhesive layer 17 may be interchanged.
Further, as will be described later, the adhesive layer of the first double-sided tape structure 28 may be a thermosetting type, and the adhesive layer of the second double-sided tape structure 29 may be a photocurable type.

Further, the embodiment of the laminated product in which two or more peelable adhesive layers are provided is not limited to the configurations of the third and fourth embodiments exemplified above, and various embodiments can be adopted. For example, in the third and fourth embodiments, the surface layer 21 is the outermost layer of the laminated products 25 and 30, but the surface layer 21 does not have to be the outermost layer, and the surface layer 21 does not have to be the outermost layer. A peeling adhesive layer such as a light peeling adhesive layer and another surface layer may be further provided on the surface in this order.

Further, in the fourth embodiment, each of the peelable adhesive layers 12 and 17 has a structure supported by the base material, and constitutes the first and second double-sided tape structures 28 and 29, but is peeled off. One of the mold adhesive layers 12 and 17 may be supported by the substrate and the other may not be supported. Therefore, in the fourth embodiment, instead of the first double-sided tape structure 28, the light peeling type adhesive layer 12 alone may be provided as in the third embodiment. Further, instead of the second double-sided tape structure 29, the heat-release type adhesive layer 17 alone may be provided as in the third embodiment.
Further, in the third and fourth embodiments, the light peeling type adhesive layer 12 and the heat peeling type adhesive layer 17 may have a laminated structure in which they are interchanged, that is, the laminated product may have a thermal structure. The peelable adhesive layer, the foam, the light peelable adhesive layer, and the surface layer may be provided in this order.

Even when a plurality of peelable adhesive layers are provided, at least one of the peelable adhesive layers may be a light and heat peelable adhesive layer that can be peeled off by both heat and light.
Further, in the laminated product 10 of the first embodiment, the first double-sided tape structure 28 may be provided instead of the light-release adhesive layer 12 as in the fourth embodiment. Similarly, in the laminated product 15 of the second embodiment, the second double-sided tape structure 29 may be provided instead of the heat-release adhesive layer 17 as in the fourth embodiment.

<Fifth Embodiment>
Next, the fifth embodiment will be described with reference to FIG. The laminated product according to the fifth embodiment is a vehicle interior material. The vehicle interior material is a ceiling material, a door, an instrument panel, or the like, and more preferably used as an automobile interior material. As shown in FIG. 5, the vehicle interior material 40 according to the fifth embodiment is a vehicle. It includes a first layer 41 that constitutes a part of the interior material, and a photo-peelable adhesive layer 12 provided on at least one surface of the first layer 41. That is, the present embodiment is the same as the first embodiment except that the foam becomes the first layer 41. Hereinafter, the fifth embodiment will be described, but the point that the description is omitted is the same as that of the first embodiment.

In a fifth embodiment, the first layer 41 preferably has light transmission. Since the first layer 41 has light transmission property, when light is irradiated from the first layer 41 side, the light is transmitted through the foam and the light peeling type adhesive layer 12 is also irradiated, and the light peeling type adhesive is adhered. The agent layer 12 can be peeled off.
The photo-peelable adhesive layer 12 can be peeled off by being irradiated with light having a predetermined wavelength, and more preferably by being irradiated with ultraviolet rays. Therefore, it is preferable that the first layer 41 can transmit light having the above-mentioned predetermined wavelength, and more preferably it can transmit ultraviolet rays. The ultraviolet transmittance of the first layer 41 may be, for example, 0.1% or more, preferably 10% or more, more preferably 20% or more, and for example, 90% or less.

The first layer 41 is not particularly limited as long as it is a member constituting a part of the vehicle interior material, and examples thereof include a resin layer, a cloth, a leather, and a metal layer. Further, it may be a foam. The first layer 41 may be composed of one layer alone, or may be a laminated body having two or more layers.
The details of the resin layer, the fabric, the leather, and the metal layer are as described in the surface layer of the second embodiment, and the details of the foam are as described in the first embodiment, such as the thickness thereof. Is as described above.
When the first layer 41 is a resin layer, it has transparency, so that it can have light transmission as described above. Further, in the case of a decorative sheet, it is preferable that the decorative layer also has light transmission. Furthermore, in the case of fabrics, leathers, and metal layers, the first method is to use coarse woven fabrics, knitted fabrics, non-woven fabrics, etc., use metal meshes, and provide a large number of fine holes. The layer 41 is preferably light transmissive.

The vehicle interior material 40 in the fifth embodiment may be attached to the adherend and, for example, peeled off from the adherend after use, as in the laminated product 10 of the first embodiment. In the fifth embodiment as well, as in the first embodiment, the light peeling type adhesive layer 12 is irradiated with light to reduce the adhesive force to the adherend and is easily peeled from the adherend. can. Therefore, the vehicle interior material 40 can be easily peeled off from the adherend without damaging the adherend or the first layer 41. Therefore, it becomes easy to separate each material, and it becomes easy to recycle the vehicle interior material 40.

<Sixth Embodiment>
Next, the sixth embodiment will be described with reference to FIG. In the sixth embodiment, the vehicle interior material 45 is a heat-release adhesive layer 17 provided on at least one surface of a first layer 41 forming a part of the vehicle interior material and the first layer 41. And prepare. That is, the present embodiment is the same as the second embodiment except that the foam becomes the first layer 41. The first layer 41 is as described in the fifth embodiment. Hereinafter, the sixth embodiment is the same as the second embodiment in that only the differences from the second embodiment are described and the description is omitted.

Also in the sixth embodiment, as in the second embodiment, the heat-removable adhesive layer 17 is heated to reduce the adhesive force to the adherend and can be easily peeled from the adherend. .. Therefore, the vehicle interior material 45 can be easily removed from the adherend without damaging the adherend or the first layer 41, the material can be easily separated, and the vehicle interior material 45 can be easily recycled. Become.

In the above 5th and 6th embodiments, one layer of the release type adhesive layer is provided in the vehicle interior material, but as shown in the following 7th and 8th embodiments, the laminated layers are provided. Similar to the product, the vehicle interior material may be provided with a plurality of peelable adhesive layers.

<7th Embodiment>
FIG. 7 shows the laminated product 50 according to the seventh embodiment. The laminated product 50 includes a light-release adhesive layer 12, a first layer 41, a heat-release adhesive layer 17, and a second layer 42, which are provided in this order. That is, the present embodiment is the same as the third embodiment except that the foam becomes the first layer 41 and the surface layer 21 becomes the second layer 42.
Hereinafter, the seventh embodiment is the same as the third embodiment in that only the differences from the third embodiment will be described and the description will be omitted.

The laminated product 50 according to the seventh embodiment includes a first layer 41 and a light peeling type adhesive layer 12 provided on one surface of the first layer 41. Further, a heat-release adhesive layer 17 is adhered to the other surface of the first layer 41, and a second layer 42 is laminated via the heat-release adhesive layer 17. The first layer 41 is as described in the fifth embodiment.

The second layer 42 is not particularly limited as long as it is a member constituting a part of the vehicle interior material, and examples thereof include a resin layer, a cloth, a leather, and a metal layer. Further, it may be a foam. The second layer 42 may be composed of one layer alone, or may be a laminated body having two or more layers. The details of the resin layer, the fabric, the leather, and the metal layer are as described in the surface layer of the sixth embodiment, and the details of the foam are as described in the first embodiment, such as the thickness thereof. Is as described above.
Further, similarly to the surface layer of the third embodiment, the second layer 42 preferably has low light transmittance and low ultraviolet transmittance, and specifically, the ultraviolet transmittance is higher than that of the first layer 41. Is preferably low. The specific value of the ultraviolet transmittance is as described in the surface layer of the third embodiment.
In the present embodiment, the first layer 41 is preferably a foam, and the second layer 42 is preferably selected from a resin layer, a cloth, a leather, and a metal layer, as in the surface layer 21, preferably at that time. The detailed configuration may be the same as that of the third embodiment.

Also in the seventh embodiment, as in the third embodiment, the adhesive strength of the adhesive layers 12 and 17 is reduced by heating and light irradiation, and the adhesive layers 12 and 17 can be peeled off. The first layer 41 and the second layer 42 can be easily separated from the adherend without damaging the first layer 41 and the second layer 42. Therefore, it becomes easy to separate each material, and it becomes easy to recycle each layer of the vehicle interior material 50.

<Eighth Embodiment>
In the vehicle interior material of the seventh embodiment described above, the peelable adhesive layers 12 and 17 were not supported by the base material or the like, but the peelable adhesive layers 12 and 17 were carried out in the fourth embodiment. As described in the form, those supported by a base material or the like may be used. A specific example thereof is shown in FIG. 8 as an eighth embodiment. Hereinafter, the parts of the eighth embodiment, the parts of which the description is omitted, are the same as those of the fourth embodiment.

In the vehicle interior material 55 according to the eighth embodiment, a base material (first base material 31 and second base material 32) is provided for each of the peelable adhesive layers 12 and 17, and each base material is provided. It has a double-sided tape structure (first double-sided tape structure 28, second double-sided tape structure 29) centered on 31 and 32.
Then, the first double-sided tape structure 28 is laminated on one surface of the first layer 41, and the second double-sided tape structure 29 is laminated on the other surface of the first layer 41, so that the first double-sided tape structure 28 is laminated. The tape structure 28 serves as an adhesive surface to be adhered to the adherend, and the second double-sided tape structure 29 adheres the second layer 42 to the other surface side of the first layer 41.

As described above, the vehicle interior material 55 includes a light-release adhesive layer 12, a first base material 31, a first adhesive layer 33, a first layer 41, a second adhesive layer 34, and a second. The base material 32, the heat-peeling adhesive layer 17, and the second layer 42 have a laminated structure provided in this order.
That is, the present embodiment is the same as the fourth embodiment except that the foam becomes the first layer 41 and the surface layer 21 becomes the second layer 42. Further, the details of the first layer 41 and the second layer 42 are as described in the seventh embodiment, and the detailed description thereof will be omitted.

Since the vehicle interior material 55 in the present embodiment has the first and second double-sided tape structures 28 and 29, the production thereof becomes easy. Further, since the first and second layers 41 and 42 can be easily separated and peeled from the adherend without damaging the adherend and the first and second layers 41 and 42, each material can be separated. Separation becomes easy, and each layer of the vehicle interior material 55 becomes easy to recycle.

Further, the embodiment of the vehicle interior material provided with two or more peelable adhesive layers is not limited to the configurations of the seventh and eighth embodiments exemplified above, and various embodiments can be adopted. The details are the same as those of the laminated product described above, except that the foam is changed to the first layer and the surface layer is changed to the second layer.
Further, in the interior material 40 of the fifth embodiment, the first double-sided tape structure 28 may be provided instead of the light-release adhesive layer 12. Similarly, in the interior material 45 of the sixth embodiment, the first double-sided tape structure 29 may be provided instead of the heat-removable adhesive layer 17.

The present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.

[Example 1]
A first double-sided tape (manufactured by Sekisui Chemical Co., Ltd., product name "Selfa HW-01", thickness 119 μm) provided with a photo-peeling adhesive layer that is peeled off when irradiated with ultraviolet rays on both sides of the substrate. ) Was prepared. Cross-linked polyolefin foam (foam "Softlon SP" manufactured by Sekisui Chemical Co., Ltd., foam magnification 15 times, closed cell ratio 98%, cross-linking degree 30%, thickness 2 mm, ultraviolet transmission on one side of the first double-sided tape The rate was 3.8%), the second double-sided tape, and the resin sheet as the surface layer were laminated in this order to obtain the laminated product shown in FIG.
The resin sheet was prepared as follows. Mitsui Chemicals TPO resin "8030N" 80 parts by mass, Prime Polymer PP resin "E333GV" 10 parts by mass, Prime Polymer LLDPE "20100J" 10 parts by mass, BASF "Irganox 1010" 0.3 parts by mass, and 0.5 parts by mass of the black pigment "PEX999018" manufactured by Tokyo Ink Co., Ltd. was kneaded and melt-extruded. A 0.5 mm thick sheet obtained by embossing the melt-extruded resin composition with an embossed roll was used as a resin sheet.
The second double-sided tape is a tape composed of a normal pressure-sensitive adhesive layer on one side of a 12 μm polyester film and a heat-release type pressure-sensitive adhesive layer containing “Advancel EMH204” manufactured by Sekisui Chemical Co., Ltd. on the other side. The peelable adhesive layer was on the surface layer side.

The obtained laminated product was attached to an easily adhesive-treated polypropylene resin plate as an adherend using a first double-sided tape. The laminate attached to the adherend was heated from the surface layer side at a heater set temperature of 200 ° C. for 5 minutes using a near-red heater. Then, when the temperature was returned to room temperature and the surface layer was manually peeled off from the second double-sided tape, the surface layer could be peeled off without any problem.
Next, using a high-pressure mercury UV irradiation device, ultraviolet rays having a wavelength of 365 nm were irradiated from the foam side at an irradiation dose of 3000 mJ / cm ² . Then, when the second double-sided tape and the laminate of the foam were peeled off from the first double-sided tape, the foam could be peeled off without being damaged. In addition, the first double-sided tape itself could be peeled off from the adherend without any problem.

[Reference Example 1]
Same as Example 1 except that a hot melt adhesive (“RU-605T” manufactured by MORESCO) having no peelable adhesive layer was used instead of the second double-sided tape to bond the foam and the surface layer. It was carried out in.
The obtained laminated product was attached to an easily adhesive-treated polypropylene resin plate as an adherend using a first double-sided tape. The laminate attached to the adherend was heated from the surface layer side at a heater set temperature of 200 ° C. for 5 minutes using a near-red heater. After that, the surface layer was manually peeled off, but the surface layer could not be easily peeled off between the layers, and the foam was partially damaged. However, the first double-sided tape itself could be peeled off from the adherend without any problem by irradiating with ultraviolet rays.

10, 15, 20 Laminated product 11 Foam 12 Photo-peelable adhesive layer 17 Thermal-release adhesive layer 21 Surface layer 28 First double-sided tape structure 29 Second double-sided tape structure 31 First base material 32 Second 33 Base material 33 First adhesive layer 34 Second adhesive layer 40, 45, 50, 55 Vehicle interior material 41 First layer 42 Second layer

Claims (12)

With foam
A laminated product provided on one surface of the foam and provided with a light or heat-removable adhesive layer that can be peeled off by light irradiation or heating. Equipped with a light-removable adhesive layer that can be peeled off by light irradiation,
The laminated product according to claim 1, wherein the foam has light transmittance. The laminated product according to claim 2, wherein the light-peelable adhesive layer can be peeled off by irradiation with ultraviolet rays. Further provided with a first substrate and a first adhesive layer,
The laminated product according to claim 2 or 3, wherein at least the photo-peelable adhesive layer, the first base material, the first adhesive layer, and the foam are provided in this order. Further provided with a heat-removable adhesive layer that can be peeled off by heating and a surface layer,
The laminated product according to any one of claims 1 to 4, wherein at least the light peeling type adhesive layer, the foam, the heat peeling type adhesive layer, and the surface layer are provided in this order. The laminated product according to claim 5, wherein the surface layer is at least one selected from the group consisting of a resin layer, a cloth, leather, and a metal layer. Further provided with a second substrate and a second adhesive layer,
Claim 5 or 6 in which at least the photo-peelable adhesive layer, the foam, the second adhesive layer, the second base material, the heat-release adhesive layer, and the surface layer are provided in this order. The described laminated product. The first layer, which forms part of the vehicle interior material,
A vehicle interior material provided on at least one surface of the first layer and provided with a light or heat-removable adhesive layer that can be peeled off by light irradiation or heating. The vehicle interior material according to claim 8, wherein the first layer is at least one selected from the group consisting of a foam, a resin layer, a fabric, a leather, and a metal layer. Equipped with a light-removable adhesive layer that can be peeled off by light irradiation,
The vehicle interior material according to claim 8 or 9, wherein the first layer has light transmission. Further provided with a heat-peeling adhesive layer that can be peeled off by heating and a second layer that constitutes a part of the vehicle interior material.
The first layer has light transmission and is
The vehicle interior material according to claim 10, wherein at least the light peeling type adhesive layer, the first layer, the heat peeling type adhesive layer, and the second layer are provided in this order. The first layer is a foam and
The vehicle interior material according to claim 11, wherein the second layer comprises at least one selected from the group consisting of a resin layer, a fabric, leather, and a metal.

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