JP5557186B2 - Reflective sheet with metal foil - Google Patents

Description

  The present invention relates to a reflective sheet that is used as a substrate material for a lighting fixture or a light-emitting device and in which a non-flowable elastic body containing a light reflector and a metal foil layer are bonded by chemical bonding. It is.

  A light-emitting device or lighting fixture that uses a light-emitting element such as a light-emitting diode (LED) as a light source has the light-emitting element mounted on a substrate on which a wiring pattern is formed, a lead wire extending from the light-emitting element, and a wiring on the substrate And is a small-sized one that is integrated so as to surround the light emitting element in a package of several mm to several cm.

  These substrates are formed by laminating a base material such as non-flowable resin, elastic rubber, or ceramic and a copper foil that becomes a wiring pattern via an adhesive and layering them. is there.

  In order to form a bonded substrate by firmly adhering with an adhesive, the wettability between the adhesive and the base material and the copper foil is the most important factor. After the copper foil is brought into contact, the adhesive is cured.

  In chemical bonding using such a fluid adhesive, the adhesive protrudes from the boundary end of the base material and copper foil to be bonded, and the thickness of the adhesive layer and sufficient control of the adhesive strength are controlled. There was a problem that it was difficult. Such a problem causes a decrease in the light emission efficiency of the light emitting device, a deterioration of the light emitting device itself, and a decrease in aesthetics, thereby reducing the quality. Further, the adhesive force is relatively weak because it is due to polymerization and intermolecular force. In addition, since the appropriate adhesive also changes when the material of the base material changes, the selection of the optimal adhesive has to be done by trial and error, which takes a lot of labor.

  On the other hand, when a non-flowable substrate and copper foil are attached with a double-sided tape with an adhesive, it is easy to control the sticking of the adhesive and the thickness of the adhesive layer, but the adhesion is caused by the very weak van der Waals force. Therefore, the force is further weakened under a high temperature or high humidity atmosphere. Therefore, the base material, the copper foil, and the pressure-sensitive adhesive are peeled off much more easily than when an adhesive is used.

  There has been almost no attempt to bond a non-flowable elastic body and a metal foil by directly generating a chemical bond without using an adhesive or a pressure-sensitive adhesive.

  In Patent Document 1, ABS resin molding is used as a method for producing an integral molded body of a resin molded body made of acrylonitrile-butadiene-styrene (ABS) and a three-dimensional silicone rubber without using an adhesive or an adhesive. A method is disclosed in which a part to be bonded is preliminarily treated with ultraviolet rays, and then a liquid addition reaction curable silicone rubber is attached to the molded body and cured to be bonded and integrated. Since this method does not directly bond non-flowable base materials molded in advance, the same problem as in the case of using an adhesive is apparent.

JP-A-8-183864

  The present invention has been made to solve the above-mentioned problems, is excellent in heat resistance and light resistance, can maintain high reflectance without causing yellowing due to heat or light, and a metal foil layer and Reflective sheet with metal foil, which is chemically bonded to an elastic layer having light reflectivity, and further capable of forming a substrate by chemically bonding the elastic layer and a base material. The purpose is to provide.

The reflection sheet with a metal foil according to claim 1 made to achieve the above object is made of an elastic rubber containing inorganic particles of a light reflecting agent dispersed therein. An elastic body layer having a hydroxyl group on the surface to be bonded and a metal foil layer having a surface to be bonded on which the hydroxyl group is generated by corona discharge treatment, plasma treatment, and / or ultraviolet irradiation treatment are mutually bonded. The inorganic atom-bonded OH groups, which are the hydroxyl groups of these , and / or the organic group-bonded OH group and the inorganic atom-bonded OH group are directly and / or laminated via ether linkage via polysiloxane. It is characterized by being bonded.

The reflective sheet with metal foil according to claim 2 is the reflective sheet according to claim 1, wherein the surface to be bonded of the elastic layer has a corona discharge treatment, a plasma treatment and / or an ultraviolet irradiation treatment. Thus, the hydroxyl group is generated there.

（式（１）中、ｎは３〜４の数であって、反応性基である−ＯＣＨ _３ の少なくとも何れかが、弾性体層１２及び金属箔層１３の表面のＯＨ基と反応するものである）又は下記化学式（２）

（式（２）中、ｐ及びｑは０又は２〜２００の数でｒは０又は２〜１００の数であってｐ＋ｑ＋ｒ＞２である。-Ａ ^１ ，-Ａ ^２ 及び-Ａ ^３ は、-ＣＨ _３ 、-Ｃ _２ Ｈ _５ 、-ＣＨ＝ＣＨ _２ 、-ＣＨ(ＣＨ _３ ) _２、 -ＣＨ _２ ＣＨ(ＣＨ _３ ) _２ 、-Ｃ(ＣＨ _３ ) _３ 、-Ｃ _６ Ｈ _５ 又は-Ｃ _６ Ｈ _１２ と、-ＯＣＨ _３ 、-ＯＣ _２ Ｈ _５ 、-ＯＣＨ＝ＣＨ _２ 、-ＯＣＨ(ＣＨ _３ ) _２ 、-ＯＣＨ _２ ＣＨ(ＣＨ _３ ) _２ 、-ＯＣ(ＣＨ _３ ) _３ 、-ＯＣ _６ Ｈ _５ 及び-ＯＣ _６ Ｈ _１２ から選ばれＯＨ基と反応し得る反応性基との何れかである。-Ｂ ^１ 及び-Ｂ ^２ は、-Ｎ(ＣＨ _３ )ＣＯＣＨ _３ 又は-Ｎ(Ｃ _２ Ｈ _５ )ＣＯＣＨ _３ と、-ＯＣＨ _３ 、-ＯＣ _２ Ｈ _５ 、-ＯＣＨ＝ＣＨ _２ 、-ＯＣＨ(ＣＨ _３ ) _２ 、-ＯＣＨ _２ ＣＨ(ＣＨ _３ ) _２ 、-ＯＣ(ＣＨ _３ ) _３ 、-ＯＣ _６ Ｈ _５ 、-ＯＣ _６ Ｈ _１２ 、-ＯＣＯＣＨ _３ 、-ＯＣＯＣＨ(Ｃ _２ Ｈ _５ )Ｃ _４ Ｈ _９ 、-ＯＣＯＣ _６ Ｈ _５ 、-ＯＮ＝Ｃ(ＣＨ _３ ) _２ 及び-ＯＣ(ＣＨ _３ )＝ＣＨ _２ から選ばれＯＨ基と反応し得る反応性基との何れかである。ｐ，ｑ及びｒを正数とする-{Ｏ-Ｓｉ(-Ａ ^１ )(-Ｂ ^１ )} _p -と-{Ｏ-Ｔｉ(-Ａ ^２ )(-Ｂ ^２ )} _ｑ -と-{Ｏ-Ａｌ(-Ａ ^３ )} _ｒ -との繰返単位中の-Ａ ^１ ，-Ａ ^２ ，-Ａ ^３ ，-Ｂ ^１ 及び-Ｂ ^２ の少なくとも何れかが前記反応性基であり、三次元化シリコーンゴム弾性基材及び被接着基材の表面のＯＨ基と反応するものである）で示される反応性基含有ポリシロキサンであることを特徴とする。 The reflective sheet with metal foil of Claim 3 is described in Claim 1 or 2 , Comprising : The said polysiloxane is following Chemical formula (1).

(In the formula (1), n is a number of 3 to 4, and at least one of the reactive groups —OCH ₃ reacts with OH groups on the surface of the elastic body layer 12 and the metal foil layer 13. Or the following chemical formula (2)

(In the formula (2), p and q are 0 or a number from 2 to 200, r is 0 or a number from 2 to 100, and p + q + r> 2. -A ¹ , -A ² and -A ³ are _{-CH 3, -C 2 H 5,} -CH = CH 2, -CH (CH 3) 2, -CH 2 CH (CH 3) 2, -C (CH 3) 3, -C 6 H 5 or -C and _{6 H 12, -OCH 3, -OC} 2 H 5, -OCH = CH 2, -OCH (CH 3) 2, -OCH 2 CH (CH 3) 2, -OC (CH 3) 3, -OC 6 It is either a reactive group selected from H ₅ and —OC ₆ H ₁₂ and capable of reacting with an OH group, —B ¹ and —B ² are —N (CH ₃ ) COCH ₃ or —N (C ₂ H ₅₎ and _{COCH 3, -OCH 3, -OC 2} H 5, -OCH = CH 2, -OCH (CH 3) 2, -OCH 2 CH (CH 3) 2, -OC (CH 3) 3, - OC ₆ H ₅ , —OC ₆ OH group selected from H ₁₂ , —OCOCH ₃ , —OCOCH (C ₂ H ₅ ) C ₄ H ₉ , —OCOC ₆ H ₅ , —ON═C (CH ₃ ) ₂ and —OC (CH ₃ ) ═CH ₂ -{O-Si (-A ¹ ) (-B ¹ )} _p -and-{O-Ti (- ) , wherein p, q and r are positive numbers. -A ¹ , -A ² , -A ³ , -B ¹ and -B in repeating units of A ² ) (-B ² )} _q -and-{O-Al (-A ³ )} _r- ² is a reactive group-containing polysiloxane represented by the above-mentioned reactive group, which reacts with the three-dimensional silicone rubber elastic substrate and the OH group on the surface of the adherend substrate). It is characterized by.

The reflective sheet with a metal foil according to claim 4 is described in any one of claims 1 to 3 , wherein the elastic rubber is silicone rubber, fluororubber, ethylene-propylene-diene-methylene copolymer. It is at least one selected from a coalescence, an isobutylene-isoprene copolymer rubber, and a styrene-butadiene copolymer rubber.

The reflective sheet with metal foil of Claim 5 is described in any one of Claims 1-4, Comprising : The said light reflector is titanium oxide, an alumina, barium sulfate, magnesia, aluminum nitride, It is characterized by being at least one filler selected from boron nitride, silica, barium titanate, kaolin, talc, and powdered aluminum.

The reflective sheet with metal foil of Claim 6 is described in any one of Claims 1-5, Comprising: The said metal foil layer is copper foil, silver foil, gold foil, or aluminum foil. Features.

The reflective sheet with metal foil described in claim 7 is described in any one of claims 1 to 6 , wherein the light reflector is contained in the elastic layer in an amount of 30 to 75% by mass. It is characterized by being.

The reflective sheet with metal foil described in claim 8 is described in any one of claims 1 to 7 , wherein the elastic layer has a thickness of 3 to 100 μm.

The reflective sheet with metal foil described in claim 9 is described in any one of claims 1 to 8, and is a flexible sheet.
The reflective sheet with a metal foil described in claim 10 is described in any one of claims 1 to 9, wherein the polysiloxane is bonded to one of the hydroxyl groups. This introduces a functional group that reacts with the other hydroxyl group and / or amplifies the concentration of the reactive group that reacts with the other hydroxyl group by bonding to one hydroxyl group, thereby forming an ether bond. It is characterized by.
The reflective sheet with a metal foil according to claim 11 is the reflective sheet according to any one of claims 1 to 10, wherein the polysiloxane is adhered to the elastic body layer and / or the metal foil layer. It is characterized by that.
The reflective sheet with metal foil described in claim 12 is the one described in any one of claims 1 to 11, wherein the elastic body layer and / or the metal foil layer is decompressed, vacuumed, pressurized. And an ether bond is formed by treatment with at least one selected from heating.
The reflective sheet with metal foil described in claim 13 is described in any one of claims 1 to 12, wherein the hardness of the elastic layer is A30 to A70 in Shore A hardness. Features.
The reflective sheet with a metal foil according to claim 14 is described in any one of claims 1 to 13, wherein the elastic layer is formed of carbon black, aerosil, dry silica, wet silica, precipitated silica. , Talc, calcium silicate, calcium carbonate, carbon fiber, Kevlar fiber, polyester fiber, and glass fiber at least any reinforcing agent; surface coating with metal of carbon black, gold powder, silver powder, copper powder, or nickel powder And / or Al ₂ O ₃ , AlN, Si ₃ N ₄ , C ₃ N ₄ , at least one conductive agent selected from metal oxide powder, ceramic powder, organic powder, and organic fiber; A heat transfer agent which is at least any powder or fiber selected from SiC and graphite is added.
The reflective sheet with a metal foil according to claim 15 is the reflective sheet according to claim 4, wherein the elastic rubber includes the silicone rubber, and the silicone rubber is a peroxide-crosslinking type. It is at least one selected from silicone rubber, addition-crosslinking silicone rubber, and condensation-crosslinking silicone rubber.
The reflective sheet with metal foil described in claim 16 is described in any one of claims 1 to 15, and is covered with a cover material which is a release sheet, and is adhered thereto.

In the substrate described in claim 17 , the hydroxyl groups possessed on the exposed surface of the elastic layer of the reflective sheet with metal foil according to claim 1 and the hydroxyl groups possessed on the adherend surface side surface of the substrate are those of each other. It is characterized by being laminated and bonded while being covalently bonded through a hydroxyl group.

The substrate described in claim 18 is the substrate described in claim 17 , characterized in that the metal foil layer is etched.

The substrate described in claim 19 is the substrate described in claim 17 or 18 , wherein the metal foil is dispersed while containing the hydroxyl group on the exposed surface of the metal foil layer and the particles of the light reflector. A hydroxyl group on the surface to be bonded of another elastic layer covering the foil layer is laminated and bonded while being covalently bonded to each other via the hydroxyl groups.

  The reflective sheet with metal foil of the present invention contains light-reflecting agent particles uniformly dispersed in the elastic layer, and can reflect light incident thereon with high efficiency. In addition, the metal foil layer and the elastic layer are in close contact with each other, and when the metal foil layer is etched, light enters the elastic layer exposed at the etched portion from the metal foil layer. Then, the light can be reflected.

  This reflective sheet with metal foil has excellent heat resistance and light resistance, and maintains high reflectivity without yellowing even when it receives heat or light of various wavelengths from a light source such as a high-brightness LED. can do.

  In the reflection sheet with metal foil, the metal foil layer and the elastic body layer are chemically bonded via the hydroxyl groups on the surfaces to be bonded to each other. There is no generation of bubbles when bonding between members via conventional adhesives, and there is no protrusion of the adhesive from the boundary of the members to be bonded, so that the appearance is excellent and high quality it can.

  Moreover, this reflective sheet with a metal foil has a metal foil layer and an elastic body layer chemically bonded via a hydroxyl group on the surface to be bonded to each other, compared to an adhesive or pressure sensitive adhesive having a weak adhesive force. It is firmly bonded. When forming a substrate using a reflective sheet with a metal foil and when using the substrate, it can be used stably without peeling off at the adhesive surface.

  According to the reflective sheet with a metal foil, by generating a hydroxyl group on the surface of the elastic layer side, it is possible to chemically bond without limiting the base material to be bonded to the substrate, thereby forming a substrate. Moreover, it can become an auxiliary material which bears the support body of the base material in substrate formation.

  The board | substrate of this invention can be used as rigid board | substrates and flexible boards, such as a light-emitting device and a lighting fixture. In the manufacturing process of the substrate, it can be processed without causing peeling on the adhesive surface. In addition, this substrate can reflect the light emitted from the light emitting element of the light emitting device on which the substrate is mounted without leaking light.

It is a schematic cross section which shows one Example of the reflective sheet with metal foil to which this invention is applied. It is a schematic cross section which shows another Example of the reflective sheet with metal foil to which this invention is applied. It is a schematic cross section which shows another Example of the reflective sheet with metal foil to which this invention is applied. It is a graph which shows the correlation with the wavelength after a heating of the elastic body layer of the reflection sheet with metal foil to which this invention is applied. It is a graph which shows the correlation between the wavelength after the heating of the base material which does not apply this invention, and a reflectance. It is a graph which shows the correlation with the wavelength in each ultraviolet irradiation time of the elastic body layer of the reflection sheet with metal foil to which this invention is applied, and a reflectance. It is a graph which shows the correlation with the wavelength in each ultraviolet irradiation time of the base material to which this invention is not applied, and a reflectance. It is a graph which shows the correlation with the wavelength and reflectance in each board | substrate formed with the reflective sheet with metal foil to which this invention is applied. It is a graph which shows the correlation with the wavelength for every thickness of the elastic body layer of the reflection sheet with metal foil to which this invention is applied, and a reflectance. It is a graph which shows the correlation with the wavelength and reflectance for each titanium oxide content of the elastic body layer of the reflective sheet with metal foil to which the present invention is applied.

  Hereinafter, although the preferable form for implementing this invention is demonstrated in detail, the scope of the present invention is not limited to these forms.

  A preferred embodiment of the reflective sheet with metal foil of the present invention will be described in detail with reference to FIG.

  The reflective sheet 1 with a metal foil is formed by laminating an elastic body layer 12 containing dispersed particles of a light reflector 11 and a metal foil layer 13 and bonding them through a chemical bond. It is. The surface to be bonded side of the elastic body layer 12 is previously subjected to corona discharge treatment, plasma treatment or ultraviolet irradiation treatment, and the surface to be bonded side of the metal foil layer 13 is previously subjected to corona discharge treatment, plasma treatment or ultraviolet irradiation treatment. In the surface, a hydroxyl group is generated and exposed, and a functional silane compound such as a crosslinkable polysiloxane serving as an adhesive is sandwiched between the elastic body layer 12 and the metal foil layer 13 and laminated. A silyl ether group bond is formed by a dehydration reaction via a hydroxyl group on the surface to be bonded, and is chemically bonded.

  In the adhesion via the hydroxyl group, the elastic body layer 12 and the metal foil layer 13 may come into contact with each other, and the hydroxyl groups on the surface to be bonded side of both layers may be directly bonded to form an ether bond.

  The elastic body layer 12 is in the form of a sheet formed of elastic rubber in which the particles of the light reflecting agent 11 are uniformly dispersed. This elastic layer 12 reflects light, and its reflectance does not decrease even when exposed to ultraviolet rays or heat rays, and is excellent in durability and weather resistance.

  The elastic layer 12 preferably has a thickness of 3 to 100 μm, more preferably 10 to 50 μm, and a hardness of Shore A hardness of A30 to A70. When the elastic body layer 12 is lower than the hardness range and is in a gel form, the adhesiveness becomes high and the handling becomes difficult.

  The elastic rubber forming the elastic layer 12 is mainly silicone rubber such as peroxide cross-linked silicone rubber, addition cross-linked silicone rubber, condensation cross-linked silicone rubber, polyol cross-linked fluoro rubber, peroxide cross-linked fluoro rubber, polyamine. Examples include fluorinated rubbers such as cross-linked fluororubbers, and olefinic rubbers such as ethylene-propylene-diene-methylene copolymers, isobutylene-isoprene copolymer rubbers, and styrene-butadiene copolymer rubbers. Silicone rubber. One kind of these elastic rubbers may be used, or a plurality of these rubbers may be mixed.

  The peroxide cross-linked silicone rubber forming the elastic layer 12 is not particularly limited as long as it is synthesized using a silicone raw material compound that can be cross-linked with a peroxide-based cross-linking agent. Molecular weight: 500,000 to 900,000), vinylmethylsiloxane / polydimethylsiloxane copolymer (molecular weight: 500,000 to 900,000), vinyl-terminated polydimethylsiloxane (molecular weight: 10,000 to 200,000), vinyl-terminated diphenylsiloxane / polydimethylsiloxane Copolymer (molecular weight: 10,000 to 100,000), vinyl-terminated diethylsiloxane / polydimethylsiloxane copolymer (molecular weight: 10,000 to 50,000), vinyl-terminated trifluoropropylmethylsiloxane / polydimethylsiloxane copolymer (molecular weight: 10,000 to 100,000) ), Vinyl-terminated polyf Nylmethylsiloxane (molecular weight: 10,000 to 10,000), vinylmethylsiloxane / dimethylsiloxane copolymer, trimethylsiloxane-terminated dimethylsiloxane / vinylmethylsiloxane copolymer, trimethylsiloxane-terminated dimethylsiloxane / vinylmethylsiloxane / diphenylsiloxane copolymer, Trimethylsiloxane-terminated dimethylsiloxane / vinylmethylsiloxane / ditrifluoropropylmethylsiloxane copolymer, trimethylsiloxane-terminated polyvinylmethylsiloxane, methacryloxypropyl-terminated polydimethylsiloxane, acryloxypropyl-terminated polydimethylsiloxane, (methacryloxypropyl) ) Methylsiloxane / dimethylsiloxane copolymer, (acryloxypropyl) Le / dimethylsiloxane copolymer.

  Specific examples of peroxide-based crosslinking agents include ketone peroxides, diacyl peroxides, hydroperoxides, dialkyl peroxides, peroxyketals, alkyl peresters, and percarbonates. Specifically, ketone peroxide, peroxyketal, hydroperoxide, dialkyl peroxide, peroxycarbonate, peroxy ester, benzoyl peroxide, dicumyl peroxide, dibenzoyl peroxide, t-butyl hydroperoxide, di-t- Butyl hydroperoxide, di (dicyclobenzoyl) peroxide, 2,5-dimethyl-2,5bis (t-butylperoxy) hexane, 2,5-dimethyl-2,5bis (t-butylperoxy) hex , Benzophenone, Mihiraaketon, dimethylaminobenzoic acid ethyl ester, benzoin ethyl ether.

  The amount of peroxide-based crosslinking agent used is appropriately selected according to the type of silicone rubber to be obtained and the nature and performance of the material of the metal foil layer 13 bonded to the elastic body layer 12 formed of the silicone rubber. The silicone rubber is used in an amount of 0.01 to 10 parts by weight, preferably 0.1 to 2 parts by weight, based on 100 parts by weight of the silicone rubber. If it is less than this range, the crosslinking degree is too low to be used as silicone rubber. On the other hand, when it exceeds this range, the degree of cross-linking is too high and the elasticity of the silicone rubber is reduced.

The addition-type silicone rubber forming the elastic layer 12 includes a vinylmethylsiloxane / polydimethylsiloxane copolymer (molecular weight: 500,000 to 900,000) synthesized in the presence of a Pt catalyst, and a vinyl-terminated polydimethylsiloxane (molecular weight: 10,000 to 20). ), Vinyl-terminated diphenylsiloxane / polydimethylsiloxane copolymer (molecular weight: 10,000 to 100,000), vinyl-terminated diethylsiloxane / polydimethylsiloxane copolymer (molecular weight: 10,000 to 50,000), vinyl-terminated trifluoropropylmethylsiloxane / poly Dimethylsiloxane copolymer (molecular weight: 10,000 to 100,000), vinyl-terminated polyphenylmethylsiloxane (molecular weight: 10,000 to 10,000), vinylmethylsiloxane / dimethylsiloxane copolymer, trimethylsiloxane group-terminated dimethylsiloxane / vinyl Vinyl group-containing polysiloxanes such as tilsiloxane / diphenylsiloxane copolymer, trimethylsiloxane group-terminated dimethylsiloxane / vinylmethylsiloxane / ditrifluoropropylmethylsiloxane copolymer, trimethylsiloxane group-terminated polyvinylmethylsiloxane, and H-terminated polysiloxanes (molecular weight: 0.1% 050,000 to 100,000), methyl H siloxane / dimethyl siloxane copolymer, polymethyl H siloxane, polyethyl H siloxane, H-terminated polyphenyl (dimethyl H siloxy) siloxane, methyl H siloxane / phenyl methyl siloxane copolymer, methyl H siloxane / octyl methyl siloxane Compositions of H-group-containing polysiloxanes such as copolymers,
Contains amino groups such as aminopropyl-terminated polydimethylsiloxane, aminopropylmethylsiloxane / dimethylsiloxane copolymer, aminoethylaminoisobutylmethylsiloxane / dimethylsiloxane copolymer, aminoethylaminopropylmethoxysiloxane / dimethylsiloxane copolymer, dimethylamino-terminated polydimethylsiloxane Polysiloxanes, epoxypropyl terminated polydimethylsiloxanes, epoxy group containing polysiloxanes such as (epoxycyclohexylethyl) methylsiloxane / dimethylsiloxane copolymers, acid anhydride group containing polysiloxanes such as succinic anhydride terminated polydimethylsiloxanes and Isocyanate group-containing compounds such as toluyl diisocyanate and 1,6-hexamethylene diisocyanate It is obtained from the composition of the.

  The processing conditions for preparing the addition-type silicone rubber from these compositions vary depending on the type and characteristics of the addition reaction, and therefore cannot be uniquely determined. Generally, however, the heating is performed at 0 to 200 ° C. for 1 minute to 24 hours. Is. Thereby, addition-type silicone rubber is obtained as elastic rubber. When the physical properties of the silicone rubber are better under low temperature processing conditions, the reaction time becomes longer. When productivity faster than physical properties is required, the processing is performed at a high temperature for a short time. When machining must be performed within a certain period of time depending on the production process and work environment, the machining temperature is set to a relatively high temperature within the above range in accordance with the desired machining time.

The condensation-type silicone rubber forming the elastic layer 12 includes silanol-terminated polydimethylsiloxane (molecular weight: 50,000 to 200,000), silanol-terminated polydiphenylsiloxane, silanol-terminated polytrily synthesized in the presence of a tin-based catalyst. A composition of a single condensation component comprising a silanol-terminated polysiloxane such as fluoromethylsiloxane, silanol-terminated diphenylsiloxane / dimethylsiloxane copolymer;
These silanol-terminated polysiloxanes, tetraacetoxysilane, triacetoxymethylsilane, di-t-butoxydiacetoxysilane, vinyltriacetoxysilane, tetraethoxysilane, trienoxymethylsilane, bis (triethoxysilyl) ethane, tetra -N-propoxysilane, vinyltrimethoxysilane, methyltris (methylethylketoxime) silane, vinyltris (methylethylketoxyimino) silane, vinyltriisopropenooxysilane, triacetoxymethylsilane, tri (ethylmethyl) oximemethylsilane, bis ( Cross-linking agents such as N-methylbenzoamido) ethoxymethylsilane, tris (cyclohexylamino) methylsilane, triacetamidomethylsilane, tridimethylaminomethylsilane The composition of,
These are obtained from a composition of these silanol-terminated polysiloxanes and end-blocked polysiloxanes such as chloro-terminated polydimethylsiloxane, diacetoxymethyl-terminated polydimethylsiloxane, and terminal polysiloxanes.

  The processing conditions for preparing the condensation-type silicone rubber from these compositions vary depending on the type and characteristics of the condensation reaction, and therefore cannot be uniquely determined, but in general, heating at 0 to 100 ° C. for 10 minutes to 24 hours. Is. Thereby, a condensation type silicone rubber is obtained as an elastic rubber. When the physical properties of the silicone rubber are better under low temperature processing conditions, the reaction time becomes longer. When productivity faster than physical properties is required, the processing is performed at a high temperature for a short time. When machining must be performed within a certain period of time depending on the production process and work environment, the machining temperature is set to a relatively high temperature within the above range in accordance with the desired machining time.

  Fluororubber is a resin that is excellent in heat resistance and does not yellow due to heat. Specific examples include vinylidene fluoride, tetrafluoroethylene-propylene, and tetrafluoroethylene-perfluorovinyl ether.

  The light reflecting agent 11 preferably has a particle size of 0.1 to 70 μm, and preferably can be uniformly dispersed in the elastic layer 12.

  Specific examples of the light reflecting agent 11 include titanium oxide, alumina, barium sulfate, magnesia, aluminum nitride, boron nitride (hexagonal / cubic), silica (crystalline silica / fused silica), barium titanate, kaolin. Inorganic white pigments such as talc and powdered aluminum. Among them, anatase type titanium oxide is preferable. These light reflecting agents may be one kind or a mixture of two or more. In particular, when another inorganic white pigment coexists with anatase-type titanium oxide, light leakage is eliminated and the reflectance is increased.

The anatase-type titanium oxide is not limited in shape, and any particle shape, for example, flake shape, irregular shape, or spherical particle can be used, but the particle size is preferably 0.1 to 10 μm, and Al ₂ O ₃ , anatase type titanium oxide surface-treated with ZrO ₂ , SiO ₂ or the like may be used.

  White anatase-type titanium oxide powder has a poor catalytic action like rutile-type titanium oxide, and has a far greater catalytic activity for decomposition than a low-activity powder that can be used as a white pigment in external preparations such as cosmetics. Anatase-type titanium oxide powder is added to building materials such as tiles made of inorganic materials and outer wall materials, and acts as a powerful photolysis catalyst that decomposes adhering foreign matter such as dust adhering to the surface of the building material. In general, when added to various polymer compounds such as thermoplastics such as polycarbonate, polyphthalamide, polyetheretherketone, it will decompose and yellow, or it will deteriorate and cause cracks. End up. However, in particular, silicone is chemically stable to anatase-type titanium oxide, so that the elastic layer formed of silicone does not change or deform over a long period of time.

These light reflecting agents 11 are preferably contained in the elastic layer 12 in an amount of 30 to 75% by mass, and more preferably 60 to 70% by mass. For example, when the light reflecting agent 11 is titanium oxide, if it is less than this range, it does not become white and sufficient reflectivity cannot be obtained. On the other hand, if it exceeds this range, it cannot be uniformly dispersed in the elastic body and molded. In addition to being unable to do so, the physical properties are significantly reduced. Furthermore, O ₂ H radicals or OH radicals generated by the catalytic activity of titanium oxide increase the organic oxidative decomposition reactivity, and the color change causes a decrease in reflectance.

  The reflective sheet 1 with a metal foil has an elastic layer 12 with light resistance such as reinforcement, conductivity, thermal conductivity, wear resistance, and ultraviolet resistance, radiation resistance, heat resistance, weather resistance, flexibility, and the like. A functional filler may be added in order to add a functional additive to increase the function or increase the amount.

  Functional fillers include, for example, various grades of carbon black such as HAF and FEF, aerosil, dry silica, wet silica, precipitated silica, nipsil, talc, calcium silicate, calcium carbonate, carbon fiber, and Kevlar fiber. , Polyester fiber, and glass fiber.

  Functional additives include, for example, carbon black, gold powder, silver powder, copper powder, nickel powder, metal oxide powder coated with these metals, ceramic powder, organic powder, organic fiber as a conductive agent. Is mentioned.

In addition, examples of the functional additive include heat transfer agents such as powders and fibers of Al ₂ O ₃ , AlN, Si ₃ N ₄ , C ₃ N ₄ , SiC, and graphite.

  These functional additives and functional fillers are appropriately added to 100 parts by mass of the elastic rubber depending on the type and properties of the elastic rubber forming the elastic layer 12 and the purpose and performance of the reflective sheet 1 with metal foil. For example, 1 to 300 parts by mass, preferably 20 to 200 parts by mass are added. When the addition amount is less than this range, the functions of the functional additive and the functional filler are not exhibited. On the other hand, when the addition amount is more than this range, the rubber elasticity of the elastic layer 12 is lowered.

  The metal foil layer 13 preferably has a thickness of 10 to 70 μm.

  Specific examples of the metal foil layer 13 include copper foil, silver foil, gold foil, and aluminum foil. Among them, a copper foil having high conductivity is preferable.

  The reflective sheet 1 with metal foil is manufactured as follows, for example.

  Elastic rubber wound in a roll shape is supplied from the roll, and the surface to be bonded is subjected to corona discharge treatment, plasma treatment or ultraviolet irradiation treatment to generate hydroxyl groups on the surface to be bonded. The reactive group containing polysiloxane solution used as an adhesive body is apply | coated to the to-be-adhered surface side surface there, and is surface-treated. Similarly, a metal foil wound in a roll shape is supplied from a roll, and the surface to be bonded is subjected to corona discharge treatment, plasma treatment or ultraviolet irradiation treatment to generate a hydroxyl group on the surface to be bonded. The bonded surface side surface of the elastic rubber and the bonded surface side surface of the metal foil that have been treated in this way are bonded together, heated with a heater, crimped with a pressure roller, and made into a predetermined size with a cutter. By cut | disconnecting, the elastic sheet | seat 12 made from elastic rubber and the metal foil layer 13 are laminated | stacked, and the reflection sheet 1 with a metal foil is obtained.

  These corona discharge treatment, plasma treatment or ultraviolet irradiation treatment is preferably performed immediately before the elastic body layer 12 and the metal foil layer 11 are bonded.

  In addition, the reflective sheet 1 with the metal foil is bonded to the elastic body layer 12 and the metal foil layer 11 chemically and firmly through hydroxyl groups generated by corona discharge treatment, plasma treatment or ultraviolet irradiation treatment. It is sufficient that the surface treatment is not performed with the reactive group-containing polysiloxane solution to be an adhesive.

  Furthermore, these adhesion | attachments should just be the heat processing only after the corona discharge process, a plasma process, or an ultraviolet irradiation process, as long as the elastic body layer 12 and the metal foil layer 11 have adhere | attached chemically firmly. Alternatively, only pressure treatment may be used.

  Although an example of forming by the roll-to-roll method has been shown, the manufacturing method of the reflective sheet 1 with metal foil is not particularly limited, and the covering of the elastic body layer 12 and the metal foil layer 13 that have been cut into an arbitrary size in advance. Corona discharge treatment, plasma treatment or ultraviolet irradiation treatment is applied to the surface of the bonding surface to generate hydroxyl groups, soak them in a reactive group-containing polysiloxane solution, and perform surface treatment. They may be bonded and bonded together. Furthermore, it may be a mold forming in which an elastic rubber is poured into a metal foil layer 12 having an arbitrary shape and pressed by a mold to form the elastic layer 12.

  These shapes are not particularly limited, and may be a planar shape or a three-dimensional shape. Alternatively, the reflection sheet 1 with a metal foil formed in a planar shape may be embossed and molded into a three-dimensional shape such as a cup shape.

  Moreover, in the process of forming the reflective sheet 1 with metal foil, the etching that is the surface processing of the reflective sheet 1 with metal foil is not particularly limited. For example, when forming a three-dimensional reflective sheet 1 with a metal foil, after etching into a planar reflective sheet 1 with a metal foil, the three-dimensional reflective sheet 1 with a metal foil may be formed by embossing. After forming the reflection sheet 1 with foil into a three-dimensional shape by embossing, the reflection sheet 1 with metal foil may be etched.

  The thus obtained reflective sheet 1 with a metal foil has not only a wavelength range of 380 to 400 nm but also a light in the visible region longer than that and a heat ray in a wavelength region of 1000 nm or less such as an infrared ray longer than that. High reflectivity and sufficient reflection without light leakage.

  The reflective sheet 1 with metal foil preferably has a thickness of 13 to 120 μm, and more preferably 13 to 80 μm. If the thickness exceeds this range, the metal foil-like reflective sheet 1 will be protrusive when drilled, resulting in poor workability.

  The reflective sheet 1 with metal foil is a cover material (not shown) in which the exposed surface of the metal foil layer 13 and the exposed surface of the elastic layer 12 of the reflective sheet 1 with metal foil are release sheets such as polyethylene terephthalate. It may be coated and bonded. Moreover, although the example in which the exposed surface of the metal foil layer 13 and the exposed surface of the elastic body layer 12 are covered with the cover material has been shown, only one of the exposed surfaces may be covered.

  Furthermore, another example in the reflective sheet 1 with a metal foil of the present invention is shown in FIG.

  In the reflective sheet 1 with metal foil, a base material 14 is laminated and bonded to the exposed surface of the elastic layer 12 of the reflective sheet 1 with metal foil to form a substrate 2. Adhesion between the reflective sheet 1 with metal foil and the base material 14 can be chemically bonded via a hydroxyl group in the same manner as the adhesion between the elastic body layer 12 and the metal foil layer 13. Moreover, in the adhesion | attachment of the reflection sheet 1 with a metal foil, and the base material 14, a mutual hydroxyl group may be couple | bonded through the above adhesive bodies, and you may join directly.

  The substrate 2 may be formed by chemically etching the reflective sheet 1 with metal foil and then pasting it on the base material 14, or by etching after pasting the reflective sheet 1 with metal foil on the base material 14. May be.

  Examples of the base material 14 forming the substrate 2 include a metal material and a metal material processed product thereof, a resin and a resin processed product, a ceramic and a ceramic processed product, a crosslinked rubber and a crosslinked rubber processed product.

  The substrate 2 in which the reflective sheet 1 with metal foil and the base material 14 are chemically bonded can be used for a light emitting device, a lighting fixture or the like. Of the light emitted from the light emitting device or the light emitting element of the lighting fixture, the light irradiated on the substrate surface can be reflected without light leakage and used effectively.

  Yet another embodiment is shown in FIG. In this reflective sheet 1 with a metal foil, a base material 14 is laminated and bonded to the exposed surface of the elastic layer 12 of the reflective sheet 1 with a metal foil to form a substrate 2, and an etched metal foil layer 13a. -Wiring 15a * 15b extended from the light emitting element 16 is adhere | attached on the exposed surface of 13b, and another elastic body layer 12a * 12b is adhere | attached on exposed surfaces other than the adhesion surface.

  The strong adhesion between the elastic layer 12 and the metal foil layer 13 of the reflective sheet 1 with metal foil is preliminarily subjected to corona discharge treatment, plasma treatment or ultraviolet treatment in order to generate hydroxyl groups on the surface to be adhered. This is very important. Similarly, for the adhesion between the reflective sheet 1 with metal foil and the base material 14, it is important that corona discharge treatment, plasma treatment or ultraviolet treatment is performed in advance in order to generate hydroxyl groups on the surface to be adhered. is there.

It is well known that when an organic material is subjected to ultraviolet irradiation treatment, corona discharge treatment or plasma treatment, a reactive group such as OH group, COOH group and C═O group is newly generated on the surface of the organic material. ing. However, since the elastic layer 12 is a material that can withstand ultraviolet irradiation, when the ultraviolet irradiation is performed, reactive groups such as OH groups on the surface are only slightly generated. On the other hand, it was confirmed by X-ray induced photoelectron spectroscopy (XPS) analysis that when the elastic body layer 12 was subjected to corona discharge treatment or plasma treatment, an extremely large amount of OH groups were formed on the surface. As a result of XPS analysis, an increase in SiOH component (Si ⁺³ ) was observed at a high concentration on the surface of the elastic layer. Therefore, it is preferable to perform corona discharge treatment or plasma treatment.

  The corona discharge treatment applied to the surfaces of the elastic body layer 12 and the metal foil layer 13 in advance is performed using, for example, a corona master (manufactured by Shinko Electric Measurement Co., Ltd., a trade name) that is an atmospheric pressure corona surface reformer, and a power source: AC100V, Gap length: 1 to 4 mm, output voltage: 5 to 40 kV (surface voltage), power: 5 to 40 W, oscillation frequency: 0 to 40 kHz, 0.1 second to 60 seconds, temperature 0 to 60 ° C., moving speed 0. It is performed under the conditions of 1 to 10 m / min and the number of movements: 1 to 20 times.

  The corona flame spraying method corona discharge treatment, which is another corona discharge treatment, uses, for example, a corona fitting (manufactured by Shinko Electric Measurement Co., Ltd., a trade name) that is a corona surface reforming device, power supply: AC 100 V, gap length: 10 cm, output voltage: 5 to 40 kV (surface voltage), power: 5 to 40 W, oscillation frequency: 0 to 40 kHz, 0.1 minute to 60 minutes, temperature 0 to 60 ° C.

  Such corona discharge treatment is generally performed by using air of 30 to 90% relative humidity (nitrogen: oxygen = 75.0: 23.5 (weight ratio)), 100% nitrogen, 100% oxygen, air mixed argon, air mixed dioxide. It is performed under an atmosphere like carbon.

  The corona discharge treatment may be performed in a state where the corona discharge treatment is wet with water, alcohols, acetones, esters, or the like.

  The atmospheric pressure plasma treatment applied in advance to the surface of the elastic body layer 12 or the metal foil layer 13 is performed using, for example, Aiplasma (trade name, manufactured by Matsushita Electric Works Co., Ltd.) which is an atmospheric pressure plasma generator, and a plasma treatment speed of 10 to 100 mm / S, power source: 200 or 220 V AC (30 A), compressed air: 0.5 MPa (1 NL / min), 10 kHz / 300 W to 5 GHz, power: 100 W to 400 W, irradiation time: 0.1 seconds to 60 seconds Done.

  The surface of the elastic body layer 12 and the metal foil layer 13 may be directly subjected to ultraviolet irradiation treatment with an ultraviolet lamp.

  An OH group is generated on the surface of the base material by atmospheric pressure corona discharge treatment, plasma treatment or ultraviolet irradiation treatment as necessary to the elastic body layer 12 or the metal foil layer 13. A distinction is made between bonded inorganic atom-bonded OH groups and organic group-bonded OH groups bonded directly to carbon atoms.

  When the elastic body layer 12 and the metal foil layer 13 are brought into contact with each other, the inorganic atom-bonded OH groups or the inorganic atom-bonded OH group and the organic group-bonded OH group cause a dehydration reaction relatively easily and directly. , Forming an ether bond (—O—) and relatively strong adhesion, but organic group-bonded OH groups hardly undergo dehydration reaction, and cannot form an ether bond directly unless it is limited. And it has only a relatively weak bond.

  For example, silicone rubber, which is an elastic rubber forming the elastic layer 12, generates a sufficiently high concentration of OH groups on the surface by corona discharge treatment or plasma treatment, but the elastic layer 12 made of non-silicone rubber or In many cases, the metal foil layer 13 and the base material 14 cannot obtain a sufficient concentration of OH groups by corona discharge treatment or plasma treatment.

  In order to adhere the elastic body layer 12 and the metal foil layer 13 which are non-fluid bodies, and the elastic body layer 12 and the base material 14 by contact, OH groups having a sufficient concentration are formed on the surfaces of the adhesion surfaces of both. It is necessary to amplify the reactive group concentration with the other OH group by using a slightly generated OH group. In particular, in order to react organic group-bonded OH groups, one organic group-bonded OH group is converted into an inorganic atom-bonded OH group, or a functional group that reacts with both organic group-bonded OH groups. It is necessary to introduce. Therefore, you may use a functional silane compound like the silane coupling agent used as an adhesive body.

  Examples of such functional silane compounds include polysiloxanes containing reactive groups that are highly reactive with OH groups.

（式（１）中、ｎは３〜４の数であって、反応性基である−ＯＣＨ_３の少なくとも何れかが、弾性体層１２及び金属箔層１３の表面のＯＨ基と反応するものである）で示される化合物が挙げられる。この化合物は、繰返単位が、ブロック共重合、又はランダム共重合したものであってもよい。このビニルメトキシシロキサンホモポリマーのようなビニルアルコキシシロキサンホモポリマーの溶液に浸漬したりその溶液を塗布したり、反応性を向上させるために、それを白金触媒懸濁液に浸し、活性シリル基中のビニル基に白金触媒を保持させてもよい。 As such a reactive group-containing polysiloxane, the following chemical formula (1)

(In the formula (1), n is a number of 3 to 4, and at least one of the reactive groups —OCH ₃ reacts with OH groups on the surface of the elastic body layer 12 and the metal foil layer 13. The compound shown by these is mentioned. In this compound, the repeating unit may be one obtained by block copolymerization or random copolymerization. To immerse or apply a solution of a vinyl alkoxysiloxane homopolymer such as this vinyl methoxysiloxane homopolymer, or to improve the reactivity, immerse it in a platinum catalyst suspension, A platinum catalyst may be held on a vinyl group.

（式（２）中、ｐ及びｑは０又は２〜２００の数でｒは０又は２〜１００の数であってｐ＋ｑ＋ｒ＞２である。-Ａ^１，-Ａ^２及び-Ａ^３は、-ＣＨ_３、-Ｃ_２Ｈ_５、-ＣＨ＝ＣＨ_２、-ＣＨ(ＣＨ_３)_２、-ＣＨ_２ＣＨ(ＣＨ_３)_２、-Ｃ(ＣＨ_３)_３、-Ｃ_６Ｈ_５又は-Ｃ_６Ｈ_１２と、-ＯＣＨ_３、-ＯＣ_２Ｈ_５、-ＯＣＨ＝ＣＨ_２、-ＯＣＨ(ＣＨ_３)_２、-ＯＣＨ_２ＣＨ(ＣＨ_３)_２、-ＯＣ(ＣＨ_３)_３、-ＯＣ_６Ｈ_５及び-ＯＣ_６Ｈ_１２から選ばれＯＨ基と反応し得る反応性基との何れかである。-Ｂ^１及び-Ｂ^２は、-Ｎ(ＣＨ_３)ＣＯＣＨ_３又は-Ｎ(Ｃ_２Ｈ_５)ＣＯＣＨ_３と、-ＯＣＨ_３、-ＯＣ_２Ｈ_５、-ＯＣＨ＝ＣＨ_２、-ＯＣＨ(ＣＨ_３)_２、-ＯＣＨ_２ＣＨ(ＣＨ_３)_２、-ＯＣ(ＣＨ_３)_３、-ＯＣ_６Ｈ_５、-ＯＣ_６Ｈ_１２、-ＯＣＯＣＨ_３、-ＯＣＯＣＨ(Ｃ_２Ｈ_５)Ｃ_４Ｈ_９、-ＯＣＯＣ_６Ｈ_５、-ＯＮ＝Ｃ(ＣＨ_３)_２及び-ＯＣ(ＣＨ_３)＝ＣＨ_２から選ばれＯＨ基と反応し得る反応性基との何れかである。ｐ，ｑ及びｒを正数とする-{Ｏ-Ｓｉ(-Ａ^１)(-Ｂ^１)}_p-と-{Ｏ-Ｔｉ(-Ａ^２)(-Ｂ^２)}_ｑ-と-{Ｏ-Ａｌ(-Ａ^３)}_ｒ-との繰返単位中の-Ａ^１，-Ａ^２，-Ａ^３，-Ｂ^１及び-Ｂ^２の少なくとも何れかが前記反応性基であり、三次元化シリコーンゴム弾性基材及び被接着基材の表面のＯＨ基と反応するものである）
で模式的に示される化合物が挙げられる。この化合物は、繰返単位が、ブロック共重合、又はランダム共重合したものであってもよい。 As another reactive group-containing polysiloxane, the following chemical formula (2)

(In the formula (2), p and q are 0 or a number from 2 to 200, r is 0 or a number from 2 to 100, and p + q + r> 2. -A ¹ , -A ² and -A ³ are _{-CH 3, -C 2 H 5,} -CH = CH 2, -CH (CH 3) 2, -CH 2 CH (CH 3) 2, -C (CH 3) 3, -C 6 H 5 or -C and _{6 H 12, -OCH 3, -OC} 2 H 5, -OCH = CH 2, -OCH (CH 3) 2, -OCH 2 CH (CH 3) 2, -OC (CH 3) 3, -OC 6 It is either a reactive group selected from H ₅ and —OC ₆ H ₁₂ and capable of reacting with an OH group, —B ¹ and —B ² are —N (CH ₃ ) COCH ₃ or —N (C ₂ H ₅₎ and _{COCH 3, -OCH 3, -OC 2} H 5, -OCH = CH 2, -OCH (CH 3) 2, -OCH 2 CH (CH 3) 2, -OC (CH 3) 3, - OC ₆ H ₅ , —OC ₆ OH group selected from H ₁₂ , —OCOCH ₃ , —OCOCH (C ₂ H ₅ ) C ₄ H ₉ , —OCOC ₆ H ₅ , —ON═C (CH ₃ ) ₂ and —OC (CH ₃ ) ═CH ₂ -{O-Si (-A ¹ ) (-B ¹ )} _p -and-{O-Ti (-), wherein p, q and r are positive numbers. -A ¹ , -A ² , -A ³ , -B ¹ and -B in repeating units of A ² ) (-B ² )} _q -and-{O-Al (-A ³ )} _r- ² is at least one of the reactive groups, and reacts with OH groups on the surfaces of the three-dimensional silicone rubber elastic substrate and the adherend substrate)
And the compounds schematically shown in FIG. In this compound, the repeating unit may be one obtained by block copolymerization or random copolymerization.

  The elastic body layer 12 and the metal foil layer 13, especially the elastic body layer 12 and the metal foil layer 13 formed of non-silicone rubber are immersed in the solution of the reactive group-containing polysiloxane that reacts with the OH group, and then When the heat treatment is performed, the reactive group-containing polysiloxane is bonded to the OH group on the surface of the base material to form a single-layer molecular film. As a result, the reactive group with the other OH group is amplified. When the elastic body layer 12 and the metal foil layer 13 are brought into contact with each other, the OH group on the other surface to be bonded is chemically bonded to the reactive group-containing polysiloxane. The OH group is indirectly bonded through the reactive group-containing polysiloxane, and the elastic body layer 12 and the metal foil layer 13 are bonded.

  The solvent used in the solution of the reactive group-containing polysiloxane must be one that does not react with the polysiloxane. Examples of such solvents include water, methanol, ethanol, isopropanol, carbitol, cellosolve, ethylene glycol, diethylene glycol, alcohols such as polyethylene glycol, acetone, methyl ethyl ketone, ketones such as cyclohexanone, diethyl ether, dipropyl ether, Examples include ethers such as anisole, esters such as ethyl acetate, butyl acetate and methyl benzoate, and hydrocarbons such as hexane and gasoline. These solvents may be used alone or in combination.

  The solution of the reactive group-containing polysiloxane is 0.001 to 10% by mass, preferably 0.01 to 1% by mass of the reactive group-containing polysiloxane with respect to 100 ml of these solvents, and an additive as necessary. Prepare by dissolving. If the reactive group-containing polysiloxane is less than 0.001% by mass, the reactive amplification effect of the OH group becomes insufficient. On the other hand, even if it exceeds 10% by mass, the reactive amplification effect is not enhanced. The functional group-containing polysiloxane is wasted.

  Additives added to the reactive group-containing polysiloxane solution include tertiary amines and organics that promote the reaction between the organic group-binding OH groups on the surface of the resin or vulcanized rubber and the reactive group-containing polysiloxane. Examples thereof include surfactants that prevent the occurrence of spots due to volatilization of the solvent in the solution on the acid, elastic layer or metal foil layer.

  In the immersion treatment in the reactive group-containing polysiloxane solution, the elastic body layer 12, the metal foil layer 13, and the base material 14 are added to this solution at 0 to 100 ° C., preferably 20 to 80 ° C. for 1 second to It is immersed for 120 minutes, preferably 1 to 30 minutes and allowed to react. Below this temperature range, the reaction time takes too much and the productivity decreases, and when this temperature range is exceeded, the elastic body layer 12, the metal foil layer 13, and the base material 14 are infiltrated with the solvent, Troublesome post-processing such as solvent removal becomes necessary. Below this reaction time, the reaction becomes insufficient and a sufficient OH group reactivity amplification effect cannot be obtained. On the other hand, when this reaction time is exceeded, productivity deteriorates.

  If only the immersion treatment in the reactive group-containing polysiloxane solution is insufficient for the reactive amplification effect of OH groups, a heat treatment may be performed. Preferable heat treatment conditions vary depending on the type and material of the elastic layer 12 and the characteristics of the reflective sheet 1 with a metal foil, and therefore cannot be limited in general. However, in terms of product functions such as thermal deformation at high temperatures. When heating at a high temperature should be avoided, heat treatment should be performed at a relatively low temperature for a long time. Heating is performed under relatively high temperature conditions with emphasis on the properties.

  It is immersed in a reactive group-containing polysiloxane solution at about room temperature, and after the solution is adsorbed to the elastic body layer 12, the metal foil layer 13 and the base material 14, when heated, the solvent volatilizes and the solid state reactive group The contained polysiloxane is adhered, and the reactivity is improved. The heating temperature is 0 to 300 ° C, preferably 80 to 200 ° C. If it falls below this range, it takes too much reaction time and the productivity is lowered. On the other hand, if it exceeds this range, these elastic body layer 12, metal foil layer 13 and base material 14 are decomposed. The heating time is 1 second to 120 minutes, preferably 1 minute to 30 minutes. If the heating time range is not reached, the reaction becomes insufficient and a sufficient OH group reactivity amplification effect cannot be obtained. On the other hand, if the heating time range is exceeded, the productivity decreases. It is even more preferable to heat at 20 to 160 ° C. for 1 to 60 minutes.

  Instead of the dipping treatment in the reactive group-containing polysiloxane solution, the reactive group-containing polysiloxane solution may be sprayed, subsequently dried, and optionally heat-treated.

  In such spraying, drying, and heat treatment, the reactive group-containing polysiloxane solution is placed in a sprayer, and the reactive group-containing polysiloxane using the sprayer is applied to the surfaces of the elastic body layer 12, the metal foil layer 13, and the substrate 14. After repeating the spraying of the siloxane solution and drying to efficiently attach the reactive group-containing polysiloxane to these substrates, it is 0 to 300 ° C., preferably 80 to 200 ° C. for 1 second to The reaction is performed by heating for 120 minutes, preferably 1 to 30 minutes. If it falls below this temperature range, the reaction time takes too much and the productivity decreases, whereas if it exceeds this temperature range, these substrates will decompose. Below this heating time range, the reaction becomes insufficient and a sufficient OH group reactivity amplification effect cannot be obtained. On the other hand, when this heating temperature time is exceeded, productivity decreases.

  For the purpose of promoting the reactivity of the organic group-bonded OH group with the inorganic atom-bonded OH group, it is possible to improve the adhesion rate, to react at a low reaction temperature, or to promote the condensation reaction of the ether bond. Tin-based catalysts such as ethylhexanoate) tin, di-n-butylbis (2-ethylhexyl malate) tin, dibutyldiacetoxytin, dioctyldilauryltin, titanium dibutoxide (bis-2,4-pentane) Dionate), titanium dipropoxide (bis-2,4-pentanedionate), titanium-based catalysts such as titanium-2-ethylhexoxide are used. These catalysts are used, for example, mixed in a reactive group-containing polysiloxane solution.

  After the treatment with the reactive group-containing polysiloxane, when the substrate is ultrasonically cleaned in an inert solvent, unreacted reactive group-containing polysiloxane and unbonded residues remaining on the substrate surface are removed, and the substrate surface is removed. The OH group of is further activated.

  Adhesion between the elastic body layer 12 and the metal foil layer 13 is non-fluid and has an elastic body layer 12 having an OH group or a reactive functional group on the surface and a non-fluid surface to the reactive functional group of the elastic substrate. When the metal foil layer 13 having a reactive OH group is brought into contact, a chemical reaction occurs at the contact interface between the two, and a covalent bond is generated and adhered. The covalent bond is such that the OH group or reactive functional group on the adherend surface side surface of the elastic body layer 12 and the OH group on the adherend surface side surface of the metal foil layer 13 are directly ether-bonded, or This is an ether bond through a reactive group-containing polysiloxane and a covalent bond.

  Such adhesion is caused by the formation of a covalent bond between polymer substances or between a polymer substance and a non-polymer substance, particularly the formation of an ether bond, as well as the chemical bond linking caused by polymer polymerization of low-molecular monomers. It was made.

  Such a covalent bond is preferably one in which the surface hydroxyl group of the elastic body layer 12 and the surface hydroxyl group of the metal foil layer 13 are dehydrated and ether-bonded. Those surface hydroxyl groups are protected by blocking with a degradable functional group in advance, and may be regenerated after being deblocked by light irradiation such as ultraviolet rays, heating, hydrolysis, etc. Good.

Such a functional group is a degradable functional group that reacts with the surface hydroxyl group of the elastic body layer 12 or the surface hydroxyl group of the metal foil layer 13, for example, —SiA ¹ _m (OB ¹ ) _3-m (where A ¹ is silicone) General functional groups of the polymer, for example, CH ₃ —, CH ₂ ═CH—, C ₆ H ₅ —, F ₃ C ₃ H ₆ —, B ¹ is an alkyl group, m is a number of 1 to 3), -SiA ² [OSi (OB ² ) ₂ ] ₂ OB (where A ² is a general functional group of a silicone polymer such as CH ₃ —, CH ₂ ═CH—, C ₆ H ₅ —, F ₃ C ₃ H _6- , and B ² is an alkyl group), —NCO, —CH (O) CH ₂ , —CHO, — (CH (+ H) CO) ₂ O, —SO ₂ Cl, —COCl, —NHCOOC (CH _{3 ) 3, -NHCOOCH (CH 3)} 2, -NHCOOCH 3, -NHCOOC 6 H 5 _{-NHCOOC 6 H 4 NO 2, -NHCOOC} 6 H 4 CN, such as _{-SO 2 C 10 H 5 N 2} O and the like.

  In order for the surface hydroxyl group of the elastic body layer 12 and the surface hydroxyl group of the metal foil layer 13 to react, when both the elastic body layer 12 and the metal foil layer 13 come into contact with each other, it is necessary to approach the range where the reaction occurs. The range in which the reaction occurs is, for example, 0.5 nm or less, which is the range in which the intermolecular force reaches.

  The factor that obstructs the approach between the elastic body layer 12 and the metal foil layer 13 is the surface roughness of the material of the elastic body layer 12 and the metal foil layer 13, and the factor that promotes the approach between them is the molecular chain. It is motility. In general, a material having a high surface roughness may not reach the range where the reaction occurs. However, since the elastic rubber forming the elastic layer 12 has molecular chain mobility, even if the elastic layer 12 and the metal foil layer 13 have a certain degree of surface roughness, they react with OH groups. To the reactive functional group to be sufficiently accessible.

  Therefore, the elastic body layer 12 has a function of canceling the surface roughness even if it is non-fluid, so it is formed of various materials such as the metal foil layer 13 and metal, resin, ceramics, glass and vulcanized rubber. It becomes possible to adhere to the formed base material 14.

  Access to an OH group and a reactive functional group that reacts with it is under reduced pressure, preferably under vacuum, by removing the gaseous medium at the contact interface or applying stress (load) to the contact interface By further heating the contact interface.

  The metal material of the base material 14 is, for example, gold, silver, copper, iron, cobalt, silicone, lead, manganese, tungsten, tantalum, platinum, cadmium, tin, palladium, nickel, chromium, titanium, zinc, aluminum, Examples include metals such as magnesium, binary, ternary and multi-component alloys of these metals. The base material formed of the metal material may be a processed product combining powder, fiber, wire, bar, net, plate, film and the like.

  Resin of the raw material of the base material 14 is phenol resin (bakelite), bismaleimide / triazine resin, cellulose and derivatives thereof, hydroxyethyl cellulose, starch, cellulose diacetate, surface saponified vinyl acetate resin, low density polyethylene, high density polyethylene, i-polypropylene, petroleum resin, polystyrene, s-polystyrene, chroman indene resin, terpene resin, styrene-divinylbenzene copolymer, ABS resin, polymethyl acrylate, polyethyl acrylate, polyacrylonitrile, methyl methacrylate, Ethyl methacrylate, polycyanoacrylate, polyvinyl acetate, polyvinyl alcohol, polyvinyl formal, polyvinyl acetal, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, vinyl chloride / ethylene copolymer Polymer, polyvinylidene fluoride, vinylidene fluoride / ethylene copolymer, vinylidene fluoride / propylene copolymer, 1,4-transpolybutadiene, polyoxymethylene, polyethylene glycol, polypropylene glycol, phenol / formalin resin, cresol / formalin Resin, Resorcin resin, Melamine resin, Xylene resin, Toluene resin, Griptal resin, Modified glyphal resin, Polyethylene terephthalate, Polybutene terephthalate, Unsaturated polyester resin, Allyl ester resin, Polycarbonate, 6-nylon, 6,6-nylon 6,10-nylon, polyimide, polyamide, polybenzimidazole, polyamideimide, silicon resin, silicone rubber, silicone resin, furan resin, polyurethane resin Epoxy resin, polyphenylene oxide, polydimethylphenylene oxide, polyphenylene oxide or polydimethylphenylene oxide and triallyl isocyanuric blend, (polyphenylene oxide or polydimethylphenylene oxide, triallyl isocyanuric, peroxide) blend, polyxylene, polyphenylene sulfide (PPS), polysulfone (PSF), polyethersulfone (PES), polyetheretherketone (PEEK), polyimide (PPI, Kapton), polytetrafluoroethylene (PTFE), liquid crystal resin, Kevlar fiber, carbon fiber and more Examples thereof include a polymer material such as a blend of materials and a cross-linked product thereof. It may be a three-dimensional silicone rubber or an uncrosslinked silicone rubber. Moreover, the base material 14 molded with resin may be a film, a plate, a three-dimensional molded body such as a curved body, or a processed product thereof. Examples of processed products include glass fiber-containing epoxy resins and paper phenol resins.

  The material ceramics of the base material 14 are silver, copper, iron, cobalt, silicone, lead, manganese, tungsten, tantalum, platinum, cadmium, tin, palladium, nickel, chromium, indium, titanium, zinc, calcium, barium, and aluminum. And oxides, nitrides, and carbides of metals such as magnesium, sodium, and potassium, and simple substances or composites thereof. The base material 14 formed of ceramics may be a processed product combining powder, fiber, wire, bar, net, plate, film and these.

  Examples of the vulcanized rubber of the base material 14 include natural rubber, 1,4-cis butadiene rubber, isoprene rubber, polychloroprene, styrene / butadiene copolymer rubber, hydrogenated styrene / butadiene copolymer rubber, acrylonitrile / butadiene. Copolymer rubber, hydrogenated acrylonitrile / butadiene copolymer rubber, polybutene rubber, polyisobutylene rubber, ethylene / propylene rubber, ethylene-propylene-diene rubber, ethylene oxide-epichlorohydrin copolymer rubber, chlorinated polyethylene rubber, chloro Sulfonated polyethylene rubber, alkylated chlorosulfonated polyethylene rubber, chloroprene rubber, chlorinated acrylic rubber, brominated acrylic rubber, fluoro rubber, epichlorohydrin and its copolymer rubber, chlorinated ethylene propylene rubber, chlorinated Homopolymer rubber such as chill rubber, brominated butyl rubber tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride and tetrafluoroethylene, and binary and terpolymer rubbers thereof, ethylene / tetrafluoroethylene copolymer rubber, Propylene / tetrafluoroethylene copolymer rubber, ethylene acrylic rubber, peroxide-type silicone rubber, addition-type silicone rubber, condensation-type silicone rubber, epoxy rubber, urethane rubber, linear polymers such as both-end unsaturated group elastomer This is a product obtained by crosslinking a blend of raw rubber materials. The vulcanized rubber adhesive is formed by crosslinking these blends.

  The base material 14 made of vulcanized rubber is molded and vulcanized by adding fillers, vulcanizing agents, vulcanization accelerators, metal activators, softeners, stabilizers, etc. to these rubbery substances. Or it is preferable that it is obtained by bonding.

  In order to crosslink such a linear polymer rubber, a crosslinking accelerator is added. For example, sulfur vulcanization, triazine dithiol-based cross-linking agent, resin cross-linking agent, polyol cross-linking agent, peroxide cross-linking agent, and chloroplatinic acid need to be added as a cross-linking agent singly or in combination.

  Examples of the crosslinking agent include a sulfenamide vulcanization accelerator, a thiuram crosslinking accelerator, a thiazole crosslinking accelerator, an amine crosslinking accelerator, and a polyfunctional monomer. These crosslinking agents are for adjusting the crosslinking rate of the rubber and increasing the strength. Peroxide-based crosslinking agents include ketone peroxide, peroxyketal, hydroperoxide, dialkyl peroxide, peroxycarbonate, peroxyester, benzoyl peroxide, dicumyl peroxide, t-butyl hydroperoxide, azobisbutyronitrile , Benzophenone, Michala arketone, dimethylaminobenzoic acid ethyl ester, benzoin ethyl ether.

  The addition amount of the crosslinking agent is appropriately determined according to the kind and properties of the vulcanized rubber and the intended purpose and performance of the silicone rubber adhesive, but is preferably 0.1 to 10 parts by mass, preferably 100 parts by mass of the vulcanized rubber. Is 0.5-5 parts by mass. If the amount is less than 0.1 parts by mass, the degree of crosslinking is too low to be used as a vulcanized rubber, whereas if it exceeds 10 parts by mass, the degree of crosslinking is too high and the vulcanized rubber will not exhibit elasticity.

  A filler may be added to the vulcanized rubber in order to increase the strength or increase the amount. Examples of the filler include various grades of carbon black such as HAF and FEF, silica, nipsil, talc, calcium silicate, calcium carbonate, carbon fiber, Kevlar fiber, polyester fiber, and glass fiber.

  Although the addition amount of a filler is suitably determined according to the intended purpose and performance of a silicone rubber adhesive body, it is 1-400 mass parts with respect to 100 mass parts of vulcanized rubber, Preferably it is 20-300 mass parts. When the amount is less than 20 parts by mass, the effect of increasing the weight is lowered, while when it exceeds 100 parts by mass, the rubber elasticity of the vulcanized rubber is lowered.

  In order to accelerate the crosslinking reaction when preparing the vulcanized rubber by crosslinking, a metal compound may be added to the raw rubber material. Examples of metal compounds include zinc oxide, magnesium oxide, calcium oxide, barium oxide, aluminum oxide, calcium hydroxide, bell oxide, iron oxide, calcium hydroxide, calcium carbonate, magnesium carbonate, fatty acid sodium, calcium octylate, and potassium isooctylate. , Potassium butoxide, cesium octylate, and potassium isostearate.

  Such a metal compound is effective not only for adjusting the crosslinking rate but also for neutralizing the by-produced halogen compound to prevent damage to the vulcanized rubber molding equipment. In order to achieve this object, the addition amount of the metal compound is 0.1 to 20 parts by mass, preferably 0.5 to 10 parts by mass with respect to 100 parts by mass of the vulcanized rubber. If the amount is less than 0.1 parts by mass, there is almost no effect of adjusting the crosslinking rate. On the other hand, if the amount exceeds 20 parts by mass, no improvement in the crosslinking rate adjusting function is observed.

  In order to improve the hardness and cold resistance of the base material 14 made of vulcanized rubber, a softening agent may be added. Examples of the softener include process oil, naphthenic oil, higher fatty acid ester, and dialkyl phthalate.

  The addition amount of the softening agent is 1 to 100 parts by mass, preferably 5 to 50 parts by mass with respect to 100 parts by mass of the vulcanized rubber. If it is less than 1 part, the softening effect is too low, and if it exceeds 100 parts by mass, the softening material is precipitated.

  Examples of the present invention will be described in detail below, but the scope of the present invention is not limited to these examples.

Example 1
100 parts by mass of titanium oxide (trade name CR-58: Ishihara Sangyo Co., Ltd.) is added to 100 parts by mass of silicone rubber (trade name KE-1935A / B: Shin-Etsu Chemical Co., Ltd.), and 120 minutes at 120 ° C. Depending on the curing conditions, a silicone rubber test piece to be an elastic body layer 12 having a thickness of 0.7 mm was produced.

(Heat resistance test)
The produced elastic body layer 12 was subjected to a heat resistance test at 150 ° C. for up to 24 hours, and the reflectance for each elapsed time was measured using a spectrophotometer (model number UV-3150: Shimadzu Corporation).
In addition, the heat resistance test was similarly performed using the base material formed with the commercially available white bismaleimide triazine resin as a comparative sample with the elastic body layer 12 which is a silicone rubber test piece, and the reflectance was measured.

  About these measurement results, FIG. 4 is a graph showing the correlation between the wavelength and the reflectance after heating of the elastic layer of the reflective sheet with metal foil, and is formed of a commercially available white bismaleimide / triazine resin that does not apply the present invention. FIG. 5 is a graph showing the correlation between the wavelength and the reflectance after heating the substrate.

  The elastic body layer 12 of the reflective sheet with metal foil of the present invention was not visually discolored before and after the heat treatment. On the other hand, in the base material formed with the bismaleimide-triazine resin which is a comparative example, yellowing was confirmed from the base material which was heat-treated for 3 hours.

  As shown in FIGS. 4 and 5, the elastic body layer 12 of the reflective sheet with metal foil of the present invention showed no significant difference before and after the heat treatment. On the other hand, in the comparative example, the reflectivity decreased from 3 hours when yellowing was observed visually, and the reflectivity decreased with increasing heating time, and about 24% at 400 to 600 nm in 24 hours. Decline was confirmed.

(UV resistance test)
The elastic body layer 12 produced as in Example 1 is irradiated with UV rays for 24 hours using an ultraviolet (UV) irradiator EXECUR 4000 (manufactured by HOYA CANDEO OPTRONICS CORPORATION), and the reflectance for each elapsed time is measured by spectrophotometry. Measurement was performed using a meter (model number UV-3150: Shimadzu Corporation). UV irradiation was performed at a mixed wavelength of 245, 313, 405, 436 nm.
Moreover, using the base material formed with the commercially available white bismaleimide triazine resin as a comparative sample with the elastic body layer 12 which is a silicone rubber test piece, UV irradiation was similarly performed and the reflectance was measured.

  About these measurement results, the graph which shows the correlation with the wavelength in each ultraviolet irradiation time of the elastic body layer of a reflecting sheet with metal foil, and a reflectance is FIG. 6, The wavelength in each ultraviolet irradiation time of the base material which does not apply this invention FIG. 7 is a graph showing the correlation between the reflectance and the reflectance.

  The elastic body layer 12 of the reflective sheet with a metal foil of the present invention was not visually discolored before and after UV irradiation. On the other hand, in the base material formed with the bismaleimide-triazine resin as a comparative example, yellowing was observed after 15 minutes of UV irradiation.

  As shown in FIGS. 6 and 7, the elastic layer 12 of the reflective sheet with metal foil of the present invention showed no significant difference before and after UV irradiation. On the other hand, in the comparative example, yellowing was observed from 15 minutes of UV irradiation, and a decrease in reflectance was observed from 5 minutes of UV irradiation. In 24 hours, a decrease of about 18% was confirmed at 400 to 600 nm.

(Example 2)
After ultrasonic cleaning of ethanol foil with a thickness of 12 μm with ethanol, CH ₂ = CHSi (OCH ₃ ) ₂ O [SiOCH ₃ (CH = CH ₂ ) O] _n Si (OCH ₃ ) ₂ CH = CH ₂ An ethanol solution (1% by mass) was applied and heat-dried at 120 ° C. for 10 minutes, and then an ethanol solution (0.5% by mass) of a platinum-divinyltetramethyldisiloxane complex was applied and dried at room temperature. 100 parts by mass of titanium oxide (trade name CR-58: Ishihara Sangyo Co., Ltd.) is added to 100 parts by mass of silicone rubber (trade name KE-1935A / B: Shin-Etsu Chemical Co., Ltd.), and the surface-treated copper is added. The metal foil layer 13 that is a foil was coated such that the elastic layer 12 had a thickness of 50 μm and cured at 120 ° C. for 15 minutes to produce a reflective sheet 1 with a metal foil.
Next, a transparent glass fiber-containing epoxy resin base material (product number R-1661: Panasonic Electric Works Co., Ltd.), a silicone resin base material (trade name SR-7010: Toray Dow Corning Co., Ltd.), a silicone resin (trade name SR- 7010: Toray Dow Corning Co., Ltd.) and titanium oxide (trade name CR-58: Ishihara Sangyo Co., Ltd.) mixed with white silicone resin base material 14, and reflective sheet 1 with metal foil and base material 14 are bonded. A substrate 2 was prepared. The adhesion method is that after the corona discharge treatment (corona master) on each base material 14 and the elastic layer 12 of the reflective sheet 1 with metal foil, the glass fiber-containing epoxy resin base material is at 130 ° C. for 10 minutes, the silicone resin base material and the oxidation base material. The white silicone resin base material containing titanium was subjected to thermocompression bonding at 100 ° C. for 5 minutes to prepare a substrate 2. The pressure during the thermocompression bonding was 120 MPa.

(Substrate reflectivity)
The copper foil is completely removed from each substrate 2 by etching, and the state in which the elastic layer 12 appears on the surface is used as a measurement sample, and the reflectance is measured using a spectrophotometer (model number UV-3150: Shimadzu Corporation). It was measured. The measurement results are shown in FIG.

  It has been found that sufficient reflectivity can be obtained even with a substrate using a transparent base material.

(Example 3)
100 parts by mass of titanium oxide (trade name CR-58: Ishihara Sangyo Co., Ltd.) is added to 100 parts by mass of silicone rubber (trade name KE-1935A / B: Shin-Etsu Chemical Co., Ltd.). A white sheet-like elastic body layer 12 was prepared so as to have a thickness of 10, 100 μm. The curing condition was 120 ° C. for 5 minutes, and a sample subjected to an annealing treatment at 120 ° C. for 90 minutes was used as a measurement sample.

(Reflectance of white sheet-like elastic layer)
The reflectance of each white sheet-like elastic layer 12 was measured using a spectrophotometer (model number UV-3150: Shimadzu Corporation). The measurement results are shown in FIG.

  As shown in FIG. 9, the elastic layer 12 of the reflective sheet with metal foil of the present invention cannot obtain sufficient reflectance when the thickness is 1 μm, but obtains sufficient reflectance when the thickness is 3 μm or more. It was confirmed that

  It has been found that sufficient reflectivity can be obtained when the thickness of the elastic layer 12 of the reflective sheet with metal foil of the present invention is 3 μm or more.

(Example 4)
50, 100, 200, and 300 parts by mass of titanium oxide (trade name CR-58: Ishihara Sangyo Co., Ltd.) are added to 100 parts by mass of silicone rubber (trade name KE-1935A / B: Shin-Etsu Chemical Co., Ltd.). The white sheet-like elastic body layer 12 was prepared so that the thickness was 50 μm. The curing condition was 120 ° C. for 5 minutes, and a sample subjected to an annealing treatment at 120 ° C. for 90 minutes was used as a measurement sample.

(Reflectance of white sheet-like elastic layer)
The reflectance of each white sheet-like elastic layer 12 was measured using a spectrophotometer (model number UV-3150: Shimadzu Corporation). The measurement results are shown in FIG.

  As shown in FIG. 10, the elastic layer 12 of the reflective sheet with metal foil of the present invention has a decrease in reflectance at 50 parts by mass with a small number of added parts (phr) of titanium oxide and 300 parts by mass with a large number of added parts. Although it was seen, the reflectance is sufficient even if it is lowered, and a sufficient reflectance can be obtained if the number of titanium oxide added to the elastic layer 12 of the reflective sheet with metal foil is 50 parts by mass or more. all right.

  The reflective sheet with a metal foil of the present invention is used as a substrate of a light emitting device or a lighting fixture using a light emitting element such as a light emitting diode, an incandescent bulb, a halogen lamp, a mercury lamp, or a fluorescent lamp as a light source, for example, a wiring board. Further, it is attached to a photoelectric conversion element such as a solar cell element, and is used as a substrate for reflecting incident light and condensing it on the photoelectric conversion element.

  1 is a reflective sheet with a metal foil, 2 is a substrate, 11 is a light reflector, 12 · 12a · 12b are elastic layers, 13 · 13a · 13b are metal foil layers, 14 is a base material, 15a and 15b are wirings, 16 Is a light emitting element.

Claims (19)

It is made of an elastic rubber containing inorganic particles of a light-reflecting agent, and has an elastic body layer having a hydroxyl group on the surface to be bonded, corona discharge treatment, plasma treatment, and / or ultraviolet irradiation treatment. And the metal foil layer having the surface to be bonded on which the hydroxyl group is generated by the inorganic atom-bonding OH group and / or the organic group-bonding OH group and the inorganic atom-bonding OH group. A reflective sheet with a metal foil, wherein the reflective sheet is laminated and bonded directly and / or via polysiloxane with ether bonding. The surface of the adherend surface of the elastic layer is subjected to corona discharge treatment, plasma treatment, and / or ultraviolet irradiation treatment, whereby the hydroxyl group is generated therein. Reflective sheet with metal foil. The polysiloxane has the following chemical formula (1)

(In the formula (1), n is a number of 3 to 4, and at least one of the reactive groups —OCH ₃ reacts with OH groups on the surface of the elastic body layer 12 and the metal foil layer 13. Or the following chemical formula (2)

(In the formula (2), p and q are 0 or a number from 2 to 200, r is 0 or a number from 2 to 100, and p + q + r> 2. -A ¹ , -A ² and -A ³ are _{-CH 3, -C 2 H 5,} -CH = CH 2, -CH (CH 3) 2, -CH 2 CH (CH 3) 2, -C (CH 3) 3, -C 6 H 5 or -C and _{6 H 12, -OCH 3, -OC} 2 H 5, -OCH = CH 2, -OCH (CH 3) 2, -OCH 2 CH (CH 3) 2, -OC (CH 3) 3, -OC 6 It is either a reactive group selected from H ₅ and —OC ₆ H ₁₂ and capable of reacting with an OH group, —B ¹ and —B ² are —N (CH ₃ ) COCH ₃ or —N (C ₂ H ₅₎ and _{COCH 3, -OCH 3, -OC 2} H 5, -OCH = CH 2, -OCH (CH 3) 2, -OCH 2 CH (CH 3) 2, -OC (CH 3) 3, - OC ₆ H ₅ , —OC ₆ OH group selected from H ₁₂ , —OCOCH ₃ , —OCOCH (C ₂ H ₅ ) C ₄ H ₉ , —OCOC ₆ H ₅ , —ON═C (CH ₃ ) ₂ and —OC (CH ₃ ) ═CH ₂ -{O-Si (-A ¹ ) (-B ¹ )} _p -and-{O-Ti (- ) , wherein p, q and r are positive numbers. -A ¹ , -A ² , -A ³ , -B ¹ and -B in repeating units of A ² ) (-B ² )} _q -and-{O-Al (-A ³ )} _r- ² is a reactive group-containing polysiloxane represented by the above-mentioned reactive group, which reacts with the three-dimensional silicone rubber elastic substrate and the OH group on the surface of the adherend substrate). The reflective sheet with metal foil according to claim 1 or 2 . The elastic rubber is at least one selected from silicone rubber, fluorine rubber, ethylene-propylene-diene-methylene copolymer, isobutylene-isoprene copolymer rubber, and styrene-butadiene copolymer rubber. Item 4. A reflective sheet with a metal foil according to any one of Items 1 to 3 . The light reflecting agent is at least one filler selected from titanium oxide, alumina, barium sulfate, magnesia, aluminum nitride, boron nitride, silica, barium titanate, kaolin, talc, and powdered aluminum. The reflective sheet with metal foil according to any one of claims 1 to 4 . The said metal foil layer is copper foil, silver foil, gold foil, or aluminum foil, The reflective sheet with metal foil in any one of Claims 1-5 characterized by the above-mentioned. The reflective sheet with metal foil according to any one of claims 1 to 6, wherein the light reflecting agent is contained in the elastic layer in an amount of 30 to 75% by mass. The thickness of the said elastic body layer is 3-100 micrometers, The reflective sheet with metal foil in any one of Claims 1-7 characterized by the above-mentioned. It is a flexible sheet | seat, The reflective sheet with metal foil in any one of Claims 1-8 characterized by the above-mentioned. The polysiloxane introduces a functional group that reacts with the other hydroxyl group by bonding to one of the hydroxyl groups, and / or reacts with the other hydroxyl group by bonding to one hydroxyl group. The reflective sheet with a metal foil according to claim 1, wherein the concentration of the reactive group to be amplified is amplified to thereby form an ether bond.   The reflective sheet with metal foil according to any one of claims 1 to 10, wherein the polysiloxane is adhered to the elastic body layer and / or the metal foil layer.   2. The ether bond is formed by treating the elastic body layer and / or the metal foil layer with at least one selected from reduced pressure, vacuum, pressure, and heating. The reflective sheet with metal foil in any one of -11. The hardness of the said elastic body layer is A30-A70 in Shore A hardness, The reflective sheet with metal foil in any one of Claims 1-12 characterized by the above-mentioned.   In the elastic layer,
  At least one reinforcing agent selected from carbon black, aerosil, dry silica, wet silica, precipitated silica, talc, calcium silicate, calcium carbonate, carbon fiber, Kevlar fiber, polyester fiber, and glass fiber;
  And / or at least one conductive agent selected from metal oxide powder, ceramic powder, organic powder, and organic fiber coated with a metal such as carbon black, gold powder, silver powder, copper powder, or nickel powder; and / or ,
  Al ₂ O ₃ , AlN, Si ₃ N ₄ , C ₃ N ₄ A heat transfer agent which is at least one powder or fiber selected from SiC, SiC, and graphite,
The reflective sheet with metal foil according to any one of claims 1 to 13, which is added.   The elastic rubber includes the silicone rubber, and the silicone rubber is at least one selected from peroxide-crosslinked silicone rubber, addition-crosslinked silicone rubber, and condensation-crosslinked silicone rubber. The reflective sheet with metal foil according to claim 4. The reflective sheet with a metal foil according to any one of claims 1 to 15, wherein the reflective sheet is covered with and bonded to a cover material which is a release sheet.   The hydroxyl group on the exposed surface of the elastic layer of the reflective sheet with metal foil according to claim 1 and the hydroxyl group on the adherend surface side surface of the substrate are bonded while being covalently bonded to each other via these hydroxyl groups. A substrate characterized by being bonded. The substrate according to claim 17 , wherein the metal foil layer is etched. The hydroxyl groups possessed on the exposed surface of the metal foil layer and the hydroxyl groups possessed on the surface to be bonded of another elastic body layer covering the metal foil layer while containing the particles of the light reflector dispersed therein, The substrate according to claim 17 or 18 , wherein the substrate is laminated and bonded while being covalently bonded through a hydroxyl group.

Images