JP2005225925A - Carrier film and carrier member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carrier film which can favorably hold an adherend by self-tack without using any adhesive, can transfer, store, supply, etc. the adherend and is excellent in flexibility, elasticity, followability, releasability, transparency, etc., and a carrier member. <P>SOLUTION: The carrier film comprises an elastomer composition containing at least one polymer chosen from a hydrogenated product of a diene block polymer and a polar group-modified olefin polymer. The hydrogenated product of the diene block polymer is preferably a hydrogenated product of a conjugated diene block polymer, a hydrogenated product of a block copolymer comprising a conjugated diene and an aromatic vinyl compound, etc. The carrier member is obtained by placing the carrier film on a support layer. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a carrier film and a carrier member. More specifically, the self-adhesiveness can satisfactorily hold an adherend such as an electronic component, an electrical component, and a mechanical component, and further, it can be transported, stored, supplied, etc., and has flexibility, elasticity, followability, peelability, and the like. The present invention relates to a carrier film and a carrier member excellent in transparency and the like.

  2. Description of the Related Art Conventionally, a technique using an adhesive sheet when conveying an electronic component or the like is known. Usually, these include a support layer made of rubber, resin, or the like, and an adhesive layer formed on one or both surfaces of the support layer. Further, in these, usually, flexibility, elasticity, followability and the like are mainly controlled by a support layer, and adhesiveness is controlled by an adhesive material which becomes an adhesive layer. As such a technique, the following Patent Document 1 is known.

Japanese Patent Laid-Open No. 11-79235

However, since the conventional transport tape or the like includes the pressure-sensitive adhesive layer made of a pressure-sensitive adhesive as described above, for example, the remaining of the pressure-sensitive adhesive may not be completely avoided. This is particularly a problem with precision electronic parts that are manufactured without dust penetration.
Further, the remaining adhesive can be removed by washing, but a new step for completely removing the used washing liquid is required, resulting in troublesome and cost increase.
Furthermore, conventionally, since properties such as flexibility, elasticity and followability are mainly controlled by a support layer or the like, it is usually necessary to have a support layer.
The present invention can hold an adherend by its self-adhesiveness without using an adhesive, and can further convey, store, supply parts, etc., and also has flexibility, elasticity, followability, peelability, transparency, etc. An object is to provide an excellent carrier film and carrier member.

The present invention is as follows.
(1) A carrier film comprising an elastomer composition containing at least one polymer selected from a hydrogenated diene block polymer and a polar group-modified olefin polymer.
(2) The hydrogenated product of the diene block polymer is at least one selected from a hydrogenated product of a block polymer of a conjugated diene and a hydrogenated product of a block copolymer composed of a conjugated diene and an aromatic vinyl compound. The carrier film according to (1) above.
(3) The hydrogenated diene block polymer comprises a butadiene polymer block (I) having a vinyl bond content of less than 25%, a conjugated diene unit (a1), and other monomer units (a2). A polymer block (II) having a mass ratio of (a1) / (a2) = (100 to 50) / (0 to 50) and a vinyl bond content of 25 to 95% is contained in each molecule at least 1 The carrier film according to the above (1) or (2), wherein the diene block polymer having one is hydrogenated.
(4) The polar group-modified olefin polymer is at least one selected from a polar group-modified ethylene / α-olefin copolymer and a polar group-modified ethylene / α-olefin / non-conjugated diene copolymer, and The carrier film according to (1), wherein the elastomer composition contains a metal ion and / or a metal compound.
(5) The carrier film according to (4), wherein the polar group is selected from a carboxyl group, a hydroxyl group, an epoxy group, an amino group, an alkoxysilyl group, a sulfonic acid group, and a nitrile group.
(6) The elastomer composition includes a liquid material, and the content of the liquid material is 1 to 5000 parts by mass with respect to 100 parts by mass in total of the polymer components. The carrier film according to any one of the above.
(7) The carrier film according to any one of (1) to (6), wherein at least a part of the elastomer composition is crosslinked.
(8) The carrier film according to any one of (1) to (7), wherein a portion selected from a convex portion, a concave portion, and a groove portion is provided on at least one surface of the carrier film.
(9) The carrier film according to any one of (1) to (8), wherein the thickness is 0.1 to 3000 μm.
(10) The carrier film according to any one of (1) to (9), wherein a protective film is provided on at least one surface side of the carrier film.
(11) A carrier member comprising: the carrier film according to any one of (1) to (10) above; and a support layer that supports the carrier film on one surface side of the carrier film.

According to the carrier film of the present invention, the adherend (electronic component, electrical component, mechanical component, etc.) can be satisfactorily held due to its self-adhesiveness and excellent flexibility, elasticity, followability, peelability and transparency. Furthermore, conveyance, storage, parts supply, etc. can be performed. Moreover, these can be performed without leaving an adhesion component etc. with respect to a to-be-adhered body especially. Furthermore, since this carrier film can exhibit sufficient transparency, it can be satisfactorily inspected during transportation and storage, positioned during component supply, and the like.
When this carrier film is a film formed by crosslinking a specific polymer, it is particularly excellent in flexibility, elasticity, strength, peelability and the like.
Moreover, when this carrier film is provided with the site | part chosen from a convex part, a recessed part, and a groove part, properties, such as followability, a softness | flexibility, and elasticity, can be controlled.
According to the carrier member of the present invention, the adherend (electronic component, electrical component, mechanical component, etc.) is good due to the self-adhesiveness of the carrier film and the excellent flexibility, elasticity, followability, peelability, transparency, etc. In addition, it is possible to carry, store and supply parts. Moreover, these can be performed without leaving an adhesion component etc. with respect to a to-be-adhered body especially. Furthermore, since the carrier film has sufficient transparency, particularly when the support layer is also transparent, inspection during transportation and storage, positioning during component supply, and the like can be favorably performed.

The present invention will be described in detail below.
The carrier film of the present invention is characterized by comprising an elastomer composition containing at least one polymer selected from a hydrogenated diene block polymer and a polar group-modified olefin polymer.

First, the hydrogenated product of the diene block polymer will be described.
The hydrogenated product of the diene block polymer is not particularly limited as long as it is a hydrogenated product of a diene block polymer. The diene block polymer may be a block copolymer of a conjugated diene or a block copolymer composed of a conjugated diene and one or more other monomers. Therefore, examples of the block structure of the diene block polymer include (AB) _mA , (BA) _m B, (ABA) _m , and (BABB) _m. are _{further, (a-B) m X} , (B-a) m X, (a-B-a) m X, as such _{(B-a-B) m} X, coupling agent residue X The polymer molecular chain may be extended or branched via In each general formula, “A” is a block mainly composed of conjugated diene units, “B” is a block mainly composed of other conjugated diene units or other monomer units, and m is an integer of 1 or more.

Examples of the conjugated diene include 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-pentadiene, 1,3-hexadiene, 4, Examples include 5-diethyl-1,3-octadiene and chloroprene. Of these, 1,3-butadiene, isoprene and 1,3-pentadiene are preferable, and 1,3-butadiene and isoprene are particularly preferable. In addition, the compound illustrated above can be used individually by 1 type or in combination of 2 or more types.
Examples of the block copolymer using these conjugated dienes include polybutadiene having two or more butadiene polymer blocks, polyisoprene having two or more isoprene polymer blocks, and the like.

  As other monomers in the case of a copolymer, styrene, t-butylstyrene, α-methylstyrene, α-chlorostyrene, p-methylstyrene, divinylbenzene, N, N-diethyl-p- Examples thereof include aromatic vinyl compounds such as aminostyrene; vinyl cyanide compounds such as (meth) acrylonitrile; nitrogen atom-containing vinyl compounds such as vinylpyridine. Of these, aromatic vinyl compounds are preferable, and styrene and α-methylstyrene are particularly preferable. In addition, the compound illustrated above can be used individually by 1 type or in combination of 2 or more types. When the diene block polymer is a block copolymer composed of a conjugated diene and another monomer, the conjugated diene unit is random and tapered (the ratio of the conjugated diene unit increases or decreases along the molecular chain). And a distribution selected from some blocks.

  Examples of block copolymers comprising conjugated dienes and one or more other monomers include styrene / butadiene block copolymers, styrene / isoprene block copolymers, isobutylene / isoprene block copolymers, acrylonitrile / Examples thereof include a butadiene block copolymer, a styrene / butadiene / styrene block copolymer, and a styrene / isoprene / styrene block copolymer.

  As the diene block polymer to be a hydrogenated diene block polymer according to the present invention, a butadiene polymer block (I) having a vinyl bond content of less than 25%, a conjugated diene unit (a1), and Polymer block (II) in which the mass proportion of other monomer units (a2) is (a1) / (a2) = (100-50) / (0-50) and the vinyl bond content is 25-95% ) Is preferably a diene block polymer (hereinafter referred to as “polymer (P)”).

  In the butadiene polymer block (I), the content of vinyl bonds (1,2-vinyl bonds) is preferably less than 25%, more preferably 5 to 20%, still more preferably 7 to 19%. Therefore, the butadiene polymer block (I) becomes a crystalline block showing a structure similar to an ethylene / butene copolymer by hydrogenation. By setting the vinyl bond content within the above range, the mechanical properties and shape retention of the molded product can be improved.

The polymer block (II) may be a block composed only of a conjugated diene unit, or may be a block composed of a conjugated diene unit (a1) and another monomer unit (a2). . The mass ratio (a1) / (a2) of the conjugated diene unit (a1) and the other monomer unit (a2) is preferably (100-50) / (0-50), more preferably (100- 70) / (0-30), more preferably (100-90) / (0-10). By setting it as such a range, the molded object excellent in viscoelasticity can be obtained.
In the polymer block (II), the content of vinyl bonds (1,2-vinyl bond and 3,4-vinyl bond) is preferably 25 to 95%, more preferably 25 to 90%, Preferably it is 30 to 85%.

Therefore, when the polymer block (I) is “A ¹ ” and the polymer block (II) is “B ¹ ”, the polymer (P) is (A ¹ -B ¹ ) _m1 , (A ¹ -B ¹⁾ _m2 -A ^1, it is possible to use those represented by _{^{(B 1 -A 1) m3 -B}} 1 or the like. In each general formula, m1 to m3 represent an integer of 1 or more.
Moreover, if the said polymer (P) is a copolymer which has a block more than a triblock, when it is made into a hydrogenated substance, the molded object which is excellent in shape retention property and a mechanical property can be obtained. Therefore, in the above general formula, m1 is preferably an integer of 2 or more.

  The polymer (P) may have at least one of the butadiene polymer block (I) and the polymer block (II) in the molecule, and in addition to these, other blocks such as Further, it may be a polymer having a block composed of a monomer unit other than the conjugated diene unit.

  The content ratio (I) / (II) of the butadiene polymer block (I) and the polymer block (II) constituting the polymer (P) is preferably (70-10) / (30-90). More preferably, (50 to 10) / (50 to 90), still more preferably (40 to 15) / (60 to 85). By setting the content ratio of each of the blocks in the above range, a molded product particularly excellent in shape retention and mechanical properties can be obtained.

Also in the polymer _{^{(P), (A 1 -B}} 1) n X, (B 1 -A 1) n X, (A 1 -B 1 -A 1) n X, (B 1 -A 1 -B ¹⁾ as such n _X, or may be via a coupling agent residue X which polymer molecular chain is extended or branched. In each general formula, n represents an integer of 2 or more. Moreover, in said each general formula, when n is three or more, the molded object excellent in shape retainability, hot-melt viscosity, and adhesiveness can be obtained.
As the coupling agent, 1,2-dibromoethane, methyldichlorosilane, trichlorosilane, methyltrichlorosilane, tetrachlorosilane, tetramethoxysilane, divinylbenzene, diethyl adipate, dioctyl adipate, benzene-1,2,4 Triisocyanate, tolylene diisocyanate, epoxidized 1,2-polybutadiene, epoxidized linseed oil, tetrachlorogermanium, tetrachlorotin, butyltrichlorotin, butyltrichlorosilane, dimethylchlorosilane, 1,4-chloromethylbenzene, bis ( And trichlorosilyl) ethane.

  The hydrogenated product of the polymer (P) can be obtained by a method disclosed in JP-A-2-133406, JP-A-3-128957, JP-A-5-170844 and the like. . The hydrogenation rate of the obtained hydrogenated product is preferably 80% or more, more preferably 85% or more, and particularly preferably 90% or more. The higher the hydrogenation rate, the better the shape retention and mechanical properties when formed into a molded body.

  When the elastomer composition is mainly a hydrogenated diene block copolymer, it may contain other polymers as long as it does not affect the flexibility of the molded product. The other polymer may be a resin or an elastomer (including rubber). Furthermore, you may combine resin and an elastomer. Other polymers are not hydrogenated polymers, that is, non-hydrogenated diene polymers, acrylic polymers, urethane polymers, polyamide polymers, polyester polymers, vinyl chloride polymers. , Fluorine-based polymers, silicone-based polymers, and the like. These can be used alone or in combination of two or more.

  Examples of the diene polymer include polybutadiene, polyisoprene, styrene / butadiene copolymer, styrene / isoprene copolymer, isobutylene / isoprene copolymer, acrylonitrile / butadiene copolymer, styrene / butadiene / styrene block copolymer. Examples thereof include polymers and styrene / isoprene / styrene block copolymers. These can be used alone or in combination of two or more.

  The above-mentioned isobutylene / isoprene copolymer is generally known as “butyl rubber (IIR)”. However, isobutylene and isoprene and other monomers such as a compound having a polar group (hereinafter referred to as “polar group”). Or a partially cross-linked copolymer thereof.

As the polar group-containing compound, an organic compound having at least one selected from a hydroxyl group, an epoxy group, an amino group, a carboxyl group, an alkoxysilyl group, a sulfonic acid group, a nitrile group, and the like can be used.
The partially cross-linked copolymer can be obtained by copolymerizing a compound having a polyfunctional unsaturated bond with these polar group-containing compounds. ) Acrylate compounds, divinyl compounds, bismaleimide compounds, dioxime compounds and the like.

  The butyl rubber may be a chlorinated isobutylene / isoprene copolymer, a brominated isobutylene / isoprene copolymer or the like in which an isobutylene / isoprene copolymer or the like is halogenated.

Examples of the acrylic polymer include a polymer obtained from a monomer containing an alkyl acrylate ester.
Examples of the acrylic acid alkyl ester include methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, isobutyl acrylate, n-pentyl acrylate, isoamyl acrylate, n-hexyl acrylate, 2-methylpentyl acrylate, and n-octyl acrylate. 2-ethylhexyl acrylate, n-decyl acrylate, n-dodecyl acrylate, n-octadecyl acrylate, cyanomethyl acrylate, 1-cyanoethyl acrylate, 2-cyanoethyl acrylate, 1-cyanopropyl acrylate, 2-cyanopropyl acrylate, 3-cyano Propyl acrylate, 4-cyanobutyl acrylate, 6-cyanohexyl acrylate, 2-ethyl-6-cyano Hexyl acrylate, 8-cyano-octyl acrylate. These can be used alone or in combination of two or more.

The acrylic polymer may be a copolymer of an acrylic acrylic ester and another monomer, for example, an acrylic rubber. In that case, an acrylic acid alkoxyalkyl ester, an ethylenically unsaturated compound, Crosslinkable compounds and the like can be used as other monomers.
Examples of the alkoxyalkyl ester of acrylic acid include 2-methoxyethyl acrylate, 2-ethoxyethyl acrylate, 2- (n-propoxy) ethyl acrylate, 2- (n-butoxy) ethyl acrylate, 3-methoxypropyl acrylate, 3-ethoxy Examples include propyl acrylate, 2- (n-propoxy) propyl acrylate, and 2- (n-butoxy) propyl acrylate.

  Examples of the ethylenically unsaturated compounds include compounds having a carboxyl group such as acrylic acid, methacrylic acid, crotonic acid, 2-pentenoic acid, maleic acid, fumaric acid, and itaconic acid; 1,1-dihydroperfluoroethyl (meth) acrylate 1,1-dihydroperfluoropropyl (meth) acrylate, 1,1,5-trihydroperfluorohexyl (meth) acrylate, 1,1,2,2-tetrahydroperfluoropropyl (meth) acrylate, 1,1,7- Fluorine-containing acrylic acid ester such as trihydroperfluoroheptyl (meth) acrylate, 1,1-dihydroperfluorooctyl (meth) acrylate, 1,1-dihydroperfluorodecyl (meth) acrylate; 1-hydroxypropyl (meth) acrylate, 2 -Hydro Compounds having a hydroxyl group such as cypropyl (meth) acrylate and hydroxyethyl (meth) acrylate; Monomers having a tertiary amino group such as diethylaminoethyl (meth) acrylate and dibutylaminoethyl (meth) acrylate; methyl methacrylate; Methacrylic acid esters such as octyl methacrylate; Alkyl vinyl ketones such as methyl vinyl ketone; Vinyl and allyl ethers such as vinyl ethyl ether and allyl methyl ether; Vinyl aromatic compounds such as styrene, α-methyl styrene, chlorostyrene and vinyl toluene; Vinyl cyanide compounds such as acrylonitrile and methacrylonitrile; ethylene, propylene, butene, vinyl chloride, vinylidene chloride, vinyl fluoride, vinylidene fluoride, vinyl acetate, propionic acid Examples include vinyl and alkyl fumarate.

  Examples of the crosslinkable compound include a diene compound, a (meth) acrylic acid ester having a dihydrodicyclopentadienyl group, an ethylenically unsaturated compound having an epoxy group, an active halogen-containing ethylenically unsaturated compound, and a carboxyl group. Examples thereof include an ethylenically unsaturated compound and an ethylenically unsaturated compound having an active hydrogen group.

Examples of the urethane polymer include those obtained by reacting an organic diisocyanate, a polymer diol, and a chain extender.
Examples of the organic diisocyanate include 4,4′-diphenylmethane diisocyanate, tolylene diisocyanate, 1,5-naphthylene diisocyanate, xylylene diisocyanate, phenylene diisocyanate, and 3,3′-dichloro-4,4′-diphenylmethane diisocyanate. Aliphatic or alicyclic diisocyanates such as hexamethylene diisocyanate, isophorone diisocyanate, 4,4′-dicyclohexylmethane diisocyanate and hydrogenated xylylene diisocyanate. These organic diisocyanates can be used alone or in combination of two or more.

Examples of the polymer diol include polyester diol, polyether diol, polycarbonate diol, polyester polycarbonate diol, and polyester polyether diol.
Among these, as polyester diol, aliphatic polyester diol obtained by reaction of aliphatic diol and aliphatic dicarboxylic acid or their ester-forming derivatives, aliphatic diol and aromatic dicarboxylic acid or their ester-forming derivatives Aromatic polyester diol obtained by the above reaction. Examples of the polyether diol include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, or block copolymers thereof. Further, examples of the polycarbonate diol include polycarbonate diol obtained by reaction of an aliphatic diol and a carbonate compound, polycarbonate diol obtained by reaction of an aromatic diol such as bisphenol A and a carbonate compound, and the like. These polymer diols can be used singly or in combination of two or more.

  As the chain extender, a conventionally known chain extender can be used, and a low molecular weight compound having a molecular weight of 300 or less having two or more active hydrogen atoms capable of reacting with an isocyanate group in the molecule, such as ethylene glycol, Propylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,4-bis (β-hydroxyethoxy) benzene, 1,4-cyclohexanediol, bis- (β-hydroxyethyl) terephthalate, xylylene glycol Diols such as hydrazine, ethylenediamine, propylenediamine, xylylenediamine, isophoronediamine, piperazine and derivatives thereof, diamines such as phenylenediamine, tolylenediamine, xylenediamine, adipic acid dihydrazine, and isophthalic acid dihydrazine, aminoethyl And amino alcohols such as alcohol and aminopropyl alcohol. These can be used alone or in combination of two or more.

  Examples of the polyamide polymer include a copolymer composed of a hard segment made of polyamide and a soft segment made of polyester, polyether, polyester / polyether or the like.

  The polyamide segment has carbon numbers such as ω-aminocaproic acid, ω-aminoenanthic acid, ω-aminocaprylic acid, ω-aminopergonic acid, ω-aminocapric acid, 11-aminoundecanoic acid, 12-aminododecanoic acid, etc. Segments derived from 6 or more aminocarboxylic acids; segments derived from lactams such as caprolactam and laurylactam; ethylenediamine, 1,2-propylenediamine, 1,3-propylenediamine, 1,4-butanediamine, 1 , 5-pentanediamine, 3-methyl-1,5-pentanediamine, 1,6-hexanediamine, 1,7-heptanediamine, 1,8-octanediamine, 2-methyl-1,8-octanediamine, , 9-nonanediamine, 1,10-decanediamine, 1,11-undeca Diamine components such as diamine, 1,12-dodecanediamine, cyclohexanediamine, and glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, terephthalic acid, isophthalic acid, orthophthalic acid, naphthalene- Examples thereof include segments derived from dicarboxylic acid components such as 2,6-dicarboxylic acid, diphenyl-4,4′-dicarboxylic acid and diphenoxyethanedicarboxylic acid.

  Examples of the polyester segment include a segment derived from a hydroxycarboxylic acid such as ω-oxycaproic acid; a segment derived from a lactone such as ε-caprolactone; glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacin Dicarboxylic acid components such as acid, dodecanedioic acid, terephthalic acid, isophthalic acid, orthophthalic acid, naphthalene-2,6-dicarboxylic acid, diphenyl-4,4′-dicarboxylic acid, diphenoxyethanedicarboxylic acid, ethylene glycol, diethylene glycol , Triethylene glycol, tetraethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,4-butanediol, 1,3-butanediol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 2-methyl-1,8-octanediol, 1,9-nonanediol, Examples thereof include segments derived from diol components such as 1,10-decanediol, cyclohexanedimethanol and cyclohexanediol.

  Examples of the polyether segment include segments such as polymethylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and polyhexamethylene glycol.

  Furthermore, as the polyester polyether segment, a segment derived from the dicarboxylic acid component of the above-described polyester segment and a diol component such as polymethylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyhexamethylene glycol, etc. Is mentioned.

  Examples of the polyester polymer include polyesters such as polybutylene terephthalate as hard segments and polyesters such as polytetramethylene glycol ether (PTMG) and PTMEG (condensate of PTMG and terephthalic acid) as soft segments. Polyether type polymer; polyester / polyester type polymer having a polyester as a hard segment and an aliphatic polyester such as polycaprolactone as a soft segment.

Examples of the fluorine-based polymer include polymers obtained from monomers containing vinylidene fluoride. Examples of other monomers include perfluorovinyl ether, tetrafluoroethylene, hexafluoropropylene, chlorotrifluoroethylene, ethylene, propylene, and a crosslinkable compound.
In addition to the above, polymers such as an ethylene / vinyl acetate copolymer, a styrene polymer, a polycarbonate, a polyacetal, and an epoxy polymer can also be used.

  The content in the case of using these other polymers is preferably 1 to 100 parts by mass, more preferably 1 to 90 parts by mass, and still more preferably 1 to 100 parts by mass of the hydrogenated product of the diene block polymer. ~ 80 parts by mass.

  When the carrier film of the present invention is composed of an elastomer composition mainly composed of the hydrogenated product of the diene block copolymer, the polymer containing the hydrogenated product of the diene block copolymer is crosslinked. It may or may not be. Examples of the method for crosslinking include a method using a known crosslinking agent, a method by irradiation with radiation such as ultraviolet rays and electron beams, and the like.

When using a crosslinking agent, an organic peroxide, sulfur, a sulfur containing compound, etc. can be used, for example.
Organic peroxides include t-butyl hydroperoxide, 1,1,3,3-tetramethylbutyl hydroperoxide, p-menthane hydroperoxide, cumene hydroperoxide, diisopropylbenzene hydroperoxide, 2,5 -Dimethylhexane-2,5-dihydroperoxide, 1,1-di-t-butylperoxy-3,3,5-trimethylcyclohexane, di-t-butyl peroxide, t-butylcumyl peroxide, dic Milperoxide, 1,1-bis (t-butylperoxy) cyclododecane, 2,2-bis (t-butylperoxy) octane, 1,1-di-t-butylperoxycyclohexane, 2,5- Dimethyl-2,5-di- (t-butylperoxy) hexane, 2,5-dimethyl 2,5-di- (t-butylperoxy) hexyne, 1,3-bis (t-butylperoxy-isopropyl) benzene, 2,5-dimethyl-2,5-di- (benzoylperoxy) Hexane, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, n-butyl-4,4-bis (t-butylperoxy) valerate, bazoyl peroxide, m-toluyl Peroxide, p-chlorobenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, t-butylperoxyisobutyrate, t-butylperoxy-2-ethylhexanoate, t-butylperoxybenzoate, t- Examples thereof include butyl peroxy-isopropyl carbonate and t-butyl peroxyallyl carbonate. These can be used alone or in combination of two or more.

  When the hydrogenated product of the diene block copolymer is cross-linked, at least a part of the elastomer composition forms a three-dimensional skeleton due to the cross-linked structure, and thus flexibility, elasticity, strength, heat resistance In addition, it is possible to form a molded article excellent in peelability and to hold the adherend satisfactorily without using an adhesive.

  Next, the polar group-modified olefin polymer will be described. Examples of the polar group-modified olefin polymer include those having a polar group in polyethylene, polypropylene, polybutene, ethylene / α-olefin copolymer, ethylene / α-olefin / non-conjugated diene copolymer, and the like. These can be used alone or in combination of two or more. Examples of the polar group include a carboxyl group, a hydroxyl group, an epoxy group, an amino group, an alkoxysilyl group, a sulfonic acid group, and a nitrile group. These polar groups may have only one type per molecule, or may have two or more types.

The α-olefin in the ethylene / α-olefin copolymer and the ethylene / α-olefin / non-conjugated diene copolymer is an α-olefin excluding ethylene. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 3-methyl-1-pentene, 4-methyl-1-pentene, and 3-ethyl-1. -Pentene, 1-octene, 1-decene, 1-undecene and the like can be mentioned, and α-olefins having 3 to 12 carbon atoms are preferable, and propylene and 1-butene are particularly preferable. In addition, the alpha-olefin illustrated above can be used individually by 1 type or in combination of 2 or more types.
Examples of the ethylene / α-olefin copolymer include ethylene / propylene copolymer, ethylene / 1-butene copolymer, ethylene / 1-pentene copolymer, ethylene / 3-methyl-1-butene copolymer, ethylene 1-hexene copolymer, ethylene-3-methyl-1-pentene copolymer, ethylene / 4-methyl-1-pentene copolymer, ethylene-3-ethyl-1-pentene copolymer, ethylene / 1 -An octene copolymer, an ethylene / 1-decene copolymer, an ethylene / 1-undecene copolymer, etc. are mentioned. Of these, ethylene / propylene copolymers and ethylene / 1-butene copolymers are preferred. The ethylene / α-olefin copolymers exemplified above can be used singly or in combination of two or more.

In addition, as the non-conjugated diene in the case of the ethylene / α-olefin / non-conjugated diene copolymer, 1,4-pentadiene, 1,4-hexadiene, 1,5-hexadiene, 1,7-octadiene, 1, 9-decadiene, 3,6-dimethyl-1,7-octadiene, 4,5-dimethyl-1,7-octadiene, 5-methyl-1,8-nonadiene, dicyclopentadiene, 5-ethylidene-2-norbornene, 5-vinyl-2-norbornene, 2,5-norbornadiene and the like can be mentioned. These can be used alone or in combination of two or more.
Examples of the ethylene / α-olefin / non-conjugated diene copolymer include ethylene / propylene / dicyclopentadiene copolymer, ethylene / propylene / 5-ethylidene-2-norbornene copolymer, ethylene / 1-butene / dicyclopentadiene. And a copolymer, an ethylene / 1-butene / 5-ethylidene-2-norbornene copolymer, and the like. These can be used alone or in combination of two or more.

  In order to make the ethylene / α-olefin copolymer and the ethylene / α-olefin / non-conjugated diene copolymer have the polar group, in the formation of each polymer, the ethylene / α-olefin copolymer has the polar group. An unsaturated compound may be used as a monomer. Such unsaturated compounds can be used singly or in combination of two or more. The amount of the unsaturated compound used is preferably 0.01 to 10 mol%, more preferably 0.1 to 5 mol%, based on the total amount of monomers.

（上記一般式（１）において、Ｒ^１は、水素原子又は炭素数１〜１０の炭化水素基であり、Ｙ^１、Ｙ^２及びＹ^３は、それぞれ独立して、水素原子、炭素数１〜１０の炭化水素基又は−ＣＯＯＨであり、Ｙ^１、Ｙ^２及びＹ^３のうち少なくとも１つは−ＣＯＯＨであり、また、Ｙ^１、Ｙ^２及びＹ^３のうち２つ以上が−ＣＯＯＨである場合は、それらは互いに連結して形成された酸無水物（−ＣＯ−（Ｏ）−ＣＯ−）であってもよい。ｐは０〜２の整数であり、ｑは０〜５の整数である。） As an unsaturated compound having a carboxyl group, maleic anhydride, (meth) acrylic acid, a cyclic compound represented by the following general formula (1), or the like can be used.

In (the above general formula (1), ^{R 1} is a hydrogen atom or a hydrocarbon group having 1 to 10 carbon ^atoms, Y 1, ^{Y 2} and ^{Y 3} are each independently a hydrogen atom, 1 to carbon atoms 10 hydrocarbon groups or —COOH, at least one of Y ¹ , Y ² and Y ³ is —COOH, and two or more of Y ¹ , Y ² and Y ³ are —COOH. In the case, they may be acid anhydrides (—CO— (O) —CO—) formed by linking each other, p is an integer of 0-2, and q is an integer of 0-5. is there.)

Examples of the cyclic compound include 5,6-dimethyl-5,6-dicarboxy-bicyclo [2.2.1] -2-heptene, 5,6-diethyl-5,6-dicarboxy-bicyclo [2. 2.1] -2-heptene, 5,6-dimethyl-5,6-bis (carboxymethyl) -bicyclo [2.2.1] -2-heptene, 5,6-diethyl-5,6-bis ( Carboxymethyl) -bicyclo [2.2.1] -2-heptene, 5-methyl-5-carboxy-bicyclo [2.2.1] -2-heptene, 5-ethyl-5-carboxy-bicyclo [2. 2.1] -2-heptene, 5-carboxy-5-carboxymethyl-bicyclo [2.2.1] -2-heptene, 5-methyl-5-carboxymethyl-bicyclo [2.2.1] -2 -Heptene, 5-ethyl-5-carboxy Chill - bicyclo [2.2.1] -2-heptene, 8,9-dimethyl-8,9-dicarboxy - tetracyclo [4.4.0.1 ^{2, 5.} 1 ^7,10 ] -3-dodecene, 8,9-diethyl-8,9-dicarboxy-tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] -3-dodecene, 8-methyl-8-carboxy-tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] -3-dodecene, 8-ethyl-8-carboxy-tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] -3-dodecene and the like. These can be used alone or in combination of two or more.

The amount of the compound represented by the general formula (1) used is preferably 0.01 to 5 mol%, more preferably 0.01 to 4 mol%, based on the total amount of the monomers. .
The polar group-modified ethylene / α-olefin copolymer or the polar group-modified ethylene / α-olefin / non-conjugated diene copolymer obtained by copolymerizing the compound represented by the general formula (1) is randomly selected. A copolymer is preferred. Further, the weight average molecular weight Mw in terms of polystyrene by GPC, such as these random copolymers, is preferably 1,000 to 3,000,000, more preferably 3,000 to 1,000,000, still more preferably. 5,000 to 700,000. The hydrogenated product of the diene block polymer can be set to the same level.

When the elastomer composition is mainly composed of a polar group-modified olefin polymer, it may contain other polymers as long as it does not affect the flexibility of the molded product. The other polymer may be a resin or an elastomer (including rubber). Furthermore, you may combine resin and an elastomer. As other polymers, those exemplified above can be used.
The content in the case of using these other polymers is preferably 1 to 100 parts by mass, more preferably 1 to 90 parts by mass, and still more preferably 1 to 80 parts by mass with respect to 100 parts by mass of the polar group-modified olefin polymer. Part by mass.

  When the carrier film of the present invention is composed of an elastomer composition mainly composed of the polar group-modified olefin polymer, the polar group-modified olefin polymer is preferably crosslinked.

When at least one selected from polar group-modified ethylene / α-olefin copolymer and polar group-modified ethylene / α-olefin / non-conjugated diene copolymer is used as the polar group-modified olefin polymer, an elastomer composition Preferably contain a metal ion, a metal compound, or the like. As a result, a chemical cross-linked structure or a structure having a similar constraint point can be formed.
In particular, when a copolymer obtained by using the cyclic compound represented by the general formula (1) is formed with a chemical cross-linked structure or a structure having a constraint point similar thereto, a metal ion or a metal compound Etc. can be used. This metal ion also means an ion of an element exemplified below and an ion of a metal compound containing this element. Examples of this element include lithium, sodium, potassium, aluminum, magnesium, calcium, barium, cesium, strontium, rubidium, titanium, zinc, copper, iron, tin, lead, zirconium, etc. Can be mentioned. The ions containing these elements can also form a crosslinked structure between the copolymers by ionic bonding or electrostatic bonding to the functional group in the random copolymer obtained above. In addition, as a substance for making the ion of the above metal compound, each metal oxide, hydroxide, salt, complex (metal carboxylate, metal acetylacetonate, etc.), an organic compound containing a metal element (having a carbon number) Alkoxides selected from 1 to 8 and containing a metal element).

  The amount of the substance used for forming the ion is 1 equivalent of a unit formed from the cyclic compound constituting the copolymer obtained by using the cyclic compound represented by the general formula (1). , Preferably 0.01 to 50 equivalents, more preferably 0.05 to 10 equivalents, particularly preferably 0.05 to 5 equivalents. If the amount of the substance used for forming the ions is too small, the resulting molded product has a low crosslink density or a constrained point density and tends to be inferior in mechanical strength and heat resistance. On the other hand, when the amount used is too large, the resulting molded article has a high crosslinking density or a constrained point density, and the hardness may be too high and become brittle. Flexibility and elasticity can be controlled by this crosslink density or restraint point density.

Furthermore, in order to improve the miscibility of the substance for forming the above ions and the heat resistance of the resulting molded body with respect to the copolymer obtained by using the cyclic compound represented by the general formula (1), In addition to the substance for making the ions, a metal salt of an organic acid such as a carboxylic acid may be added as an activator. As the metal salt of the carboxylic acid, a metal salt of a monovalent or divalent carboxylic acid having 3 to 23 carbon atoms is preferably used.
Further, the metal element in the metal salt used as the activator may be selected from the metal elements constituting the substance for forming the ion, but the same kind of element as the metal element constituting the substance for forming the ion It is preferable to use a metal salt containing.

When using the above-mentioned polar group-modified olefin polymer, in addition to cross-linking with metal ions, metal compounds, etc., cross-linking by covalent bonds is also formed by methods such as irradiation with ultraviolet rays and electron beams, methods using organic peroxides, etc. You may let them.
When the polar group-modified olefin polymer is crosslinked, at least a part of the elastomer composition forms a three-dimensional skeleton due to the crosslinked structure, and flexibility, elasticity, strength, heat resistance and peelability In addition, it is possible to form an excellent molded article and to hold the adherend satisfactorily without using an adhesive.

  The elastomer composition according to the present invention constitutes an elastomer composition both in the case of mainly a hydrogenated diene block copolymer and in the case of mainly a polar group-modified olefin polymer. By changing the content ratio with other components (softener, metal ion, etc.), the flexibility, self-adhesiveness, etc. of the obtained carrier film can be adjusted.

In the present invention, it is preferable that the elastomer composition contains a liquid material in order to obtain a molded body with improved flexibility. This not as the liquid material is particularly limited, preferably has a kinematic viscosity at 40 ° C. is ^{500mm 2 / s (1mm 2 /} s = 1cSt) below. More preferred kinematic viscosity 400 mm ² / s or less, more preferably 0.1 to 100 mm ² / s.
As such a liquid material, a softener, a plasticizer, a lubricant, a liquid polymer, or the like can be suitably used.

Examples of the softener include petroleum-based softeners such as paraffinic oil, mineral oil, ethylene / α-olefin oligomers, mineral oil-based softeners such as gilsonite, and fatty acids such as oleic acid and ricinoleic acid.
Plasticizers include various fatty acids such as phthalic acid derivatives, isophthalic acid derivatives, tetrahydrophthalic acid derivatives, adipic acid derivatives, sebacic acid derivatives, fumaric acid derivatives, citric acid derivatives, azelaic acid derivatives, phosphoric acid derivatives, maleic acid derivatives, etc. Derivatives and the like.
Examples of the lubricant include paraffin-based lubricant, hydrocarbon-based lubricant, and metal soap.
Examples of the liquid polymer include various polymers that are liquid at room temperature, and examples include liquid rubber such as liquid polybutadiene and liquid styrene / butadiene rubber, polyisobutylene, and silicone oil.
The liquid materials exemplified above can be used singly or in combination of two or more. These liquid materials can contribute to forming a molded body particularly excellent in flexibility when the elastomer composition is mainly a hydrogenated diene block copolymer.

  The amount of the liquid material used is preferably 1 to 5000 parts by mass, more preferably 1 to 4000 parts by mass, when the total amount of the polymer components contained in the elastomer composition is 100 parts by mass. More preferably, it is 5-3000 mass parts, Most preferably, it is 5-2000 mass parts. When the blending amount of the liquid material is less than 50 parts by mass, a molded article having a desired elastic modulus may not be obtained. On the other hand, when the blending amount of the liquid material exceeds 5000 parts by mass, the liquid material may ooze from the molded body. In addition, in the said mixing | blending, the liquid polymer at normal temperature shall not be handled as said polymer component, but shall be handled as a liquid material.

The elastomer composition according to the present invention may contain an additive or the like as long as the mechanical properties and shape retention of the film formed thereby are not impaired.
These additives include softeners, plasticizers, lubricants, antioxidants, anti-aging agents, UV absorbers, flame retardants, heat stabilizers, antibacterial agents, fungicides, weathering agents, tackifiers, nucleating agents , Fillers, silane coupling agents, titanium coupling agents, colorants (dyes, pigments) and the like.

  Examples of the anti-aging agent include naphthylamine, diphenylamine, p-phenylenediamine, quinoline, hydroquinone derivative, mono, bis, tris, polyphenol, thiobisphenol, hindered phenol, and phosphite. , Imidazole, nickel dithiocarbamate, phosphoric acid anti-aging agent and the like. These can be used alone or in combination of two or more.

  Examples of the ultraviolet absorber include benzophenones, benzotriazoles, salicylic acid esters, metal complex salts and the like. These can be used alone or in combination of two or more.

  The type and amount of the colorant are not particularly limited, but a colored transparent carrier film is obtained by selecting a colorant having good dispersibility for the elastomer composition and controlling the amount used. be able to.

  Using the above elastomer composition, injection molding, extrusion molding, hollow molding, compression molding, vacuum molding, laminate molding, calendar molding, cast molding, coater molding, roll molding, T-die coater, T-die extrusion molding, injection molding, etc. A molded body (carrier film) having a desired shape can be obtained by a known method.

The carrier film of the present invention can have various surface structures or cross-sectional structures depending on the purpose, application and the like. Moreover, with this surface structure and cross-sectional structure, the adhesiveness, peelability, followability, etc. can be controlled according to the adherend.
The surface structure and the cross-sectional structure can be flat (see FIG. 1), for example. In addition, on at least one surface of the carrier film, a part such as a convex part (see FIG. 2), a concave part (see FIG. 3), a groove part (see FIG. 3), etc., can be used alone or in combination of two or more. Can be provided. The shape of each of these parts is not particularly limited, and in the case of a convex part and a concave part, it can be a circle, a square (polygon such as a triangle or a quadrangle), a star, or a random shape. There are no particular limitations on the length of the opening (maximum length or the like) in the case of these shapes, the height in the case of a convex portion, the depth or the like in the case of a concave portion. Moreover, in the case of a groove part, it can be set as the shape arbitrarily selected or combined from linear form, curvilinear form, etc. The cross-sectional shape of the groove portion can also be a shape corresponding to the purpose and application, such as a square shape, a U-shape. Further, the width and depth of the groove are not particularly limited.
In addition, also when providing the said site | part with two or more, the shape, size, etc. of each site | part may be the same, and the combination of different things may be sufficient. Furthermore, the interval between adjacent portions is not particularly limited.

  A carrier film provided with the said site | part is illustrated with sectional drawing (FIG.2 and FIG.3). The carrier film 1 in FIG. 2 is a schematic cross-sectional view showing a carrier film having a plurality of convex portions 11 on one surface. FIG. 3 is a schematic cross-sectional view showing a carrier film having a plurality of recesses (or grooves) 12 on one surface. By having these convex portions and / or concave portions, it is possible to control the adhesiveness, peelability, followability, etc. to the adherend. That is, by controlling the contact area with respect to the adherend, it is possible to particularly control the adhesiveness and peelability. Further, by making the convex part and / or the concave part conform to the shape exhibited by the adherend, the followability can be controlled particularly.

The carrier film of the present invention has excellent strength and flexibility, and the shear storage modulus (G ′) obtained by dynamic viscoelasticity measurement at 30 ° C. and 1 Hz is preferably 1 to 3 × 10. ⁶ dyn / cm ² , more preferably 10 to 2 × 10 ⁶ dyn / cm ² , and still more preferably 10 ² to 10 ⁶ dyn / cm ² .
Moreover, the carrier film of this invention is excellent also in heat resistance, Preferably it is -80-100 degreeC, More preferably, it has a softness | flexibility and shape retainability in -50-70 degreeC.
Therefore, the carrier film of the present invention is suitable not only for use at room temperature but also for use at a low temperature of 0 ° C. or lower.

  The carrier film of the present invention preferably has a low concentration of metal components (including ions), anions, and the like contained in the film in order to prevent contamination of an adherend (especially a semiconductor chip). Examples of the metal component include cations such as sodium ions. Moreover, a chlorine ion etc. are mentioned as an anion. These concentrations are preferably 1000 ppm or less, more preferably 50 ppm or less, and still more preferably 20 ppm or less. However, as in the case of using a crosslinked elastomer composition, metal ions and the like blended for the purpose of crosslinking are not included in the above concentration.

The thickness of the carrier film of the present invention is preferably 0.1 to 3000 μm, more preferably 1 to 2000 μm, and particularly preferably 10 to 1500 μm.
In addition, the self-adhesive property of this carrier film can be easily maintained while maintaining its shape after being adhered to a general object made of inorganic materials (metals, alloys, ceramics, etc.), organic materials, etc. Since the adhesive film does not contain an adhesive, no adhesive residue is left on the adherend when the carrier film is peeled from the adherend.

The carrier film of the present invention can be provided with a protective film on at least one surface thereof. That is, a protective film may be provided on one side or both sides. By providing the protective film, for example, an adherend can be protected. The constituent material of this protective film is not particularly limited. For example, α-olefin such as polyethylene, polypropylene, ethylene / propylene copolymer, polybutene, ethylene / vinyl acetate copolymer, ethylene / ethyl acrylate copolymer, ionomer, etc. Homopolymers or copolymers, polyesters such as polyethylene terephthalate and polyethylene naphthalate, thermoplastic elastomers, and the like.
The contact surface of the protective film with the carrier film may be subjected to chemical treatment such as corona treatment, plasma treatment, and primer treatment. Further, in order to facilitate peeling, a silicone-based or fluorine-based release coating layer may be provided. Moreover, you may have an unevenness | corrugation.
The protective film may be a single layer or a multilayer. Moreover, the thickness of this protective film is 10-3000 micrometers normally, Preferably it is 10-2000 micrometers, More preferably, it is 10-500 micrometers.
Furthermore, the shape of the carrier film of the present invention is not particularly limited, and may be a long shape, a roll shape, a circle, a square (polygon such as a triangle or a quadrangle), a star, It may be adjusted to a predetermined shape such as a random shape.

In particular, in the present invention, when a protective film having good releasability with respect to the carrier film is provided, attachment of the carrier films can be prevented, and the carrier film should be in a roll shape (used in a roll shape). (See FIG. 4).
The roll-shaped carrier film illustrated in FIG. 4 includes a protective film 13, the adherend 3 is held between the carrier film 1 and the protective film 13, and is protected from dust and the like by the protective film 13. Further, the carrier film 1 is protected by a protective film 13 so that the carriers 1 are not attached to each other. The carrier film 1 is wound around a reel 4 in a roll shape.
By adopting a roll shape, it contributes to omission of space in transportation and storage. Moreover, by setting it as a roll shape, it can arrange | position to a component supply apparatus as it is, and can be used. In particular, since the carrier film has transparency, positioning and the like can be performed optically when supplying parts. Furthermore, visual inspection can also be performed.

  The carrier member of the present invention is characterized in that the carrier film is disposed on a support layer. A schematic view of the carrier member is illustrated with the cross-sectional views of FIGS. The carrier member 2 in FIG. 5 has a structure in which a carrier film 1 a is disposed on the entire surface of the support layer 21. On the other hand, the carrier member 2 in FIG. 6 has a structure in which a carrier film 1b is disposed on one surface of the support layer 21. In the form of FIG. 6, by having the carrier film 1b partially, the adhesiveness and peelability can be controlled in the same way that the carrier film itself can be controlled by having a convex part and / or a convex part. Can do.

The support layer may be made of any material, but is usually an organic material (made of a resin composition, paper, cloth, etc.), and is a film made of a resin composition or the like. Particularly preferred. The material constituting the support layer may be selected in consideration of the adhesive force between the carrier film and the support layer according to the purpose and application.
Further, the support layer may be a solid body made of the above-described constituent material, or may be a foam. Furthermore, the support layer may be a single layer or a multilayer. The thickness of the support layer is not particularly limited, but is preferably 0.1 to 2000 μm, more preferably 1 to 1000 μm, and particularly preferably 10 to 500 μm.

  The carrier film and the carrier member of the present invention are suitable for holding electronic components such as semiconductor chips, semiconductor packages, printed boards, semiconductor wafers and glass substrates, and devices. Further, each of these adherends can be used for transportation, storage, parts supply, and the like. The “semiconductor” includes a silicon semiconductor and a compound semiconductor.

Hereinafter, the present invention will be specifically described with reference to examples. In addition, this invention is not restrict | limited at all by these Examples. Further, “%” and “part” in the examples are based on mass unless otherwise specified.
1. Preparation of Elastomer Composition Elastomer compositions (i) to (ix) were prepared by mixing the polymers and liquid materials shown below at the ratios shown in Table 1.
1-1. Polymer (1) Hydrogenated Diene Block Copolymer (A1)
25 kg of cyclohexane, 1 g of tetrahydrofuran, 1500 g of 1,3-butadiene and 3.9 g of n-butyllithium were charged into a reaction vessel having an internal volume of 50 liters purged with nitrogen, and polymerization was started at 70 ° C. After completion of the reaction, the temperature of the reaction solution was set to 40 ° C., 100 g of tetrahydrofuran was added, and then 3500 g of 1,3-butadiene was added for further adiabatic polymerization. After 30 minutes, 2.7 g of methyldichlorosilane was added and reacted for 15 minutes to complete the reaction.
Next, hydrogen gas was supplied at a pressure of 0.4 MPa-G, and while the reaction solution was stirred, it was reacted with living polymer terminal lithium as a living anion for 20 minutes to obtain hydrogenated lithium. Thereafter, the reaction solution was brought to 80 ° C., titanocene dichloride as a hydrogenation catalyst was added, and the mixture was reacted for 2 hours while maintaining the hydrogen gas pressure at 1.0 MPa. After the reaction, the reaction solution was returned to room temperature and normal pressure and extracted from the reaction vessel. Next, the reaction solution was stirred into water and the solvent was removed by steam distillation to obtain the target diene block copolymer hydrogenated product A1. The hydrogenation rate of the hydrogenated product A1 of the obtained diene block copolymer was 99%, the weight average molecular weight by GPC was 340,000, and the vinyl bond content of the first butadiene polymer block of the polymer before hydrogenation was 14 %, The vinyl bond content of the second butadiene polymer block of the polymer before hydrogenation was 49%.

(2) Hydrogenated product of diene block copolymer (A2)
25 kg of cyclohexane, 1 g of tetrahydrofuran, 1500 g of 1,3-butadiene and 4.1 g of n-butyllithium were charged into a reaction vessel having an internal volume of 50 liters purged with nitrogen, and polymerization was started at 70 ° C. After the completion of the reaction, the temperature of the reaction solution was set to 35 ° C., 27 g of tetrahydrofuran and then 3500 g of 1,3-butadiene were added to further carry out adiabatic polymerization. After 30 minutes, 2.9 g of methyldichlorosilane was added and reacted for 15 minutes to complete the reaction.
Next, hydrogen gas was supplied at a pressure of 0.4 MPa-G, and while the reaction solution was stirred, it was reacted with living polymer terminal lithium as a living anion for 20 minutes to obtain hydrogenated lithium. Thereafter, the reaction solution was brought to 80 ° C., titanocene dichloride as a hydrogenation catalyst was added, and the mixture was reacted for 2 hours while maintaining the hydrogen gas pressure at 1.0 MPa. After the reaction, the reaction solution was returned to room temperature and normal pressure and extracted from the reaction vessel. Next, the reaction solution was stirred into water and the solvent was removed by steam distillation to obtain the target diene block copolymer hydrogenated product A2. The hydrogenation rate of the hydrogenated product A2 of the resulting diene block copolymer was 98%, the weight average molecular weight by GPC was 290,000, and the vinyl bond content of the first butadiene polymer block of the polymer before hydrogenation was 14 %, The vinyl bond content of the second stage butadiene polymer block of the polymer before hydrogenation was 35%.

(3) Hydrogenated product of diene block copolymer (A3)
25 kg of cyclohexane, 1 g of tetrahydrofuran, 1500 g of 1,3-butadiene and 4.1 g of n-butyllithium were added to a reaction vessel having an internal volume of 50 liters purged with nitrogen, and polymerization was started at 70 ° C. After completion of the reaction, the temperature of the reaction solution was set to 35 ° C., 350 g of tetrahydrofuran, and then 3500 g of 1,3-butadiene were added for further adiabatic polymerization. After 30 minutes, 2.9 g of methyldichlorosilane was added and reacted for 15 minutes to complete the reaction.
Next, hydrogen gas was supplied at a pressure of 0.4 MPa-G, and while the reaction solution was stirred, it was reacted with living polymer terminal lithium as a living anion for 20 minutes to obtain hydrogenated lithium. Thereafter, the reaction solution was brought to 80 ° C., titanocene dichloride as a hydrogenation catalyst was added, and the mixture was reacted for 2 hours while maintaining the hydrogen gas pressure at 1.0 MPa. After the reaction, the reaction solution was returned to room temperature and normal pressure and extracted from the reaction vessel. Next, the reaction solution was stirred into water and the solvent was removed by steam distillation to obtain the target diene block copolymer hydrogenated product A3. The hydrogenation rate of the hydrogenated product A3 of the obtained diene block copolymer was 99%, the weight average molecular weight by GPC was 300,000, and the vinyl bond content of the first butadiene polymer block of the polymer before hydrogenation was 14 %, The vinyl bond content of the second stage butadiene polymer block of the polymer before hydrogenation was 78%.

(4) Polar group-modified olefin polymer (A4)
75.1 mol% of structural units derived from ethylene, 22.8 mol% of structural units derived from propylene, 1.8 mol% of structural units derived from 5-ethylidene-2-norbornene, and 8-methyl- 8-carboxytetracyclo [4.4.0.1 ^2,5 . 100 parts of a functional group-containing olefin copolymer containing 0.3 mol% of a structural unit derived from 1 ^7,10 ] -3-dodecene and having a weight average molecular weight (Mw) of 16.0 × 10 ⁴ Then, 0.25 mol% of zirconium (IV) butoxide (85% 1-butanol solution (Wako Pure Chemical Industries, Ltd.) is used with respect to 1 mol% of the functional group in the functional group-containing olefin copolymer. Product) was used, and toluene was removed by drying to obtain a polar group-modified olefin polymer A4.
(5) Thermoplastic polyurethane elastomer (A5)
For comparison, a thermoplastic polyurethane elastomer (manufactured by Kuraray Co., Ltd., trade name “Clamiron U1190”) was used.

1-2. Liquid material “B1”: a mineral oil-based softener (trade name “PW-32” manufactured by Idemitsu Kosan Co., Ltd.) having a kinematic viscosity at 40 ° C. of 30.85 mm ² / s.
“B2”: a mineral oil softener (trade name “PW-90” manufactured by Idemitsu Kosan Co., Ltd.) having a kinematic viscosity at 40 ° C. of 95.54 mm ² / s.
“B3”: a mineral oil softener (trade name “PW-380” manufactured by Idemitsu Kosan Co., Ltd.) having a kinematic viscosity at 40 ° C. of 381.6 mm ² / s.
1-3. Crosslinking agent “C1”; organic peroxide (manufactured by NOF Corporation, trade name “Perhexa 3M”).

2. Production of carrier film and evaluation thereof Examples 1 to 8 and Comparative Example 1
Using the elastomer compositions (i) to (ix), a film having a thickness of 500 μm was produced by coater molding, and this was used as a carrier film. This carrier film was evaluated by the following method. The results are shown in Table 2.

(1) Flexibility The shear storage elastic modulus (G ′) of the film (thickness: 500 μm) was measured under the conditions of a temperature of 30 ° C. and a frequency of 1 Hz using a dynamic viscoelasticity measuring device (Rheology, model “MR-500”). It was measured. The lower the G ′ value, the more flexible and does not damage the surface of the adherend. In Table 2, “◯” indicates that the G ′ value was 3,000,000 dyn / cm ² or less, and “×” indicates that the G ′ value was greater than 3,000,000 dyn / cm ^2. Indicates.

(2) Strength Based on JIS K-7127, the tensile strength and tensile elongation of the film were measured at a tensile speed of 500 mm / min.

(3) Follow-up property Obtained on one surface having bumps of a silicon semiconductor wafer having a diameter of 6 inches, a thickness of 600 μm (not including bump height), and a bump of 100 μm height formed on one surface side. A carrier film (thickness 500 μm) was attached using a pressure roll. Thereafter, the contact surface between each carrier film and the bump of the silicon semiconductor wafer was observed with an optical microscope at a magnification of 100 times to confirm the presence or absence of a gap.
As a result, almost no gap was observed, and the carrier film had excellent followability with respect to the bump shape of the bump of the silicon semiconductor wafer. On the other hand, in the case where many gaps were observed and sufficient followability was not obtained, “x” is shown in Table 2.

(4) Peelability A 100 μm-thick carrier film and a 188 μm-thick PET film (support layer) are placed in this order on one surface of a glass plate (Corning, product name “corning 1737”). Each film was pressure-bonded by reciprocating the roller once. Then, the carrier film was peeled from the glass plate together with the PET film, and the peel strength at the interface between the carrier film and the glass plate was measured. The peel strength was measured at a peel angle of 180 ° and a peel speed of 300 mm / min.
As a result, since the peel strength is 5 N / 20 mm or less, those that could be easily peeled were “◯” in Table 2, and because the peel strength exceeded 5 N / 20 mm, the peel strength was not easy. In Table 2, “x” is shown.

(5) Transparency The total light transmittance (%) at 25 ° C. of a carrier film having a thickness of 100 μm was measured. For the measurement, a product name “haze-gard plus” manufactured by BYK-Gardner GmbH was used. The results are shown in Table 2.

(6) Low metal Sodium ion concentration was measured by inductively coupled plasma optical emission spectrometry (IPC-AES), and chlorine ion concentration was measured by ion chromatography. As a result, those having both ion concentrations of 1000 ppm or less are indicated by “◯” in Table 2, and those having at least one ion concentration of 1000 ppm or more are indicated by “X” in Table 2.

(7) Adhesive residue Using a silicon semiconductor wafer as an adherend, each adhesive film was held and then peeled off. Thereafter, the presence or absence of adhesive residue on the surface of the peeled silicon semiconductor wafer was visually observed. As a result, “◯” was shown in Table 2 for those in which no adhesive residue was observed, and “X” was shown in Table 2 for those in which adhesive residue was observed.

3. About an evaluation result From Table 2, it turns out that the carrier film of the comparative example 1 cannot fully follow the unevenness | corrugation of the surface of a to-be-adhered body. This is thought to be due to insufficient flexibility and tensile elongation. Further, it cannot be easily peeled off, and the residual ion concentration is high, resulting in adhesive residue. For this reason, it can be seen that depending on the adherend, the adherend itself may be destroyed, and the adherend may be soiled. Furthermore, it is not preferable in terms of workability.
On the other hand, in Examples 1-8, all are excellent in a softness | flexibility and tensile elongation, and it turns out that it can fully follow the unevenness | corrugation of the surface of a to-be-adhered body. It can also be seen that peeling is easy, the remaining ion concentration is low or hardly left, and no adhesive residue is produced. For this reason, it can be seen that when the adherend is peeled off from the carrier film, the adherend is not destroyed, the adherend is not soiled, and the workability is excellent. Furthermore, since it has excellent transparency, it can be seen that it is excellent in inspection and confirmation of adherends, has good workability when used for parts supply in a production line, etc., and contributes to prevention of errors.

  The carrier film and the carrier member of the present invention are widely used as a holding member. That is, for example, it is used as a conveyance member, a storage member, a component supply member, or the like.

It is typical sectional drawing which shows one example (with a flat surface) of this carrier film. It is typical sectional drawing which shows the other example (it is provided with a convex part) of this carrier film. It is typical sectional drawing which shows the other example (it equips with a recessed part) of this carrier film. It is typical sectional drawing which shows one example (it is provided with a protective film and is roll shape) of this carrier film. It is typical sectional drawing which shows one example of a carrier member. It is typical sectional drawing which shows the other example of a carrier member.

Explanation of symbols

  1, 1a and 1b; carrier film, 11; convex portion, 12; concave portion or groove portion, 13; protective film, 2; carrier member, 21; support layer, 3;

Claims (11)

  A carrier film comprising an elastomer composition containing at least one polymer selected from a hydrogenated diene block polymer and a polar group-modified olefin polymer.   The hydrogenated product of the diene block polymer is at least one selected from a hydrogenated product of a block polymer of a conjugated diene and a hydrogenated product of a block copolymer comprising a conjugated diene and an aromatic vinyl compound. The carrier film according to 1.   The hydrogenated diene block polymer has a mass ratio of the butadiene polymer block (I) having a vinyl bond content of less than 25%, the conjugated diene unit (a1) and the other monomer unit (a2). Diene having (a1) / (a2) = (100-50) / (0-50) and at least one polymer block (II) having a vinyl bond content of 25-95% in the molecule. The carrier film according to claim 1 or 2, wherein the system block polymer is hydrogenated.   The polar group-modified olefin polymer is at least one selected from a polar group-modified ethylene / α-olefin copolymer and a polar group-modified ethylene / α-olefin / non-conjugated diene copolymer, and the elastomer. The carrier film according to claim 1, wherein the composition contains metal ions and / or metal compounds.   The carrier film according to claim 4, wherein the polar group is selected from a carboxyl group, a hydroxyl group, an epoxy group, an amino group, an alkoxysilyl group, a sulfonic acid group, and a nitrile group.   The carrier according to any one of claims 1 to 5, wherein the elastomer composition includes a liquid material, and the content of the liquid material is 1 to 5000 parts by mass with respect to 100 parts by mass in total of the polymer components. the film.   The carrier film according to claim 1, wherein at least a part of the elastomer composition is crosslinked.   The carrier film according to any one of claims 1 to 7, comprising a portion selected from a convex portion, a concave portion and a groove portion on at least one surface of the carrier film.   The carrier film according to claim 1, which has a thickness of 0.1 to 3000 μm.   The carrier film according to claim 1, further comprising a protective film on at least one surface side of the carrier film.   A carrier member comprising: the carrier film according to any one of claims 1 to 10; and a support layer that supports the carrier film on one side of the carrier film.

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