WO2012144644A1 - 環状オレフィン系樹脂の架橋体及びその製造方法 - Google Patents
環状オレフィン系樹脂の架橋体及びその製造方法 Download PDFInfo
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- WO2012144644A1 WO2012144644A1 PCT/JP2012/060849 JP2012060849W WO2012144644A1 WO 2012144644 A1 WO2012144644 A1 WO 2012144644A1 JP 2012060849 W JP2012060849 W JP 2012060849W WO 2012144644 A1 WO2012144644 A1 WO 2012144644A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F32/00—Homopolymers and copolymers of cyclic compounds having no unsaturated aliphatic radicals in a side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic ring system
- C08F32/02—Homopolymers and copolymers of cyclic compounds having no unsaturated aliphatic radicals in a side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic ring system having no condensed rings
- C08F32/04—Homopolymers and copolymers of cyclic compounds having no unsaturated aliphatic radicals in a side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic ring system having no condensed rings having one carbon-to-carbon double bond
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/28—Treatment by wave energy or particle radiation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F232/00—Copolymers of cyclic compounds containing no unsaturated aliphatic radicals in a side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic ring system
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
- C08J7/123—Treatment by wave energy or particle radiation
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
Definitions
- the present invention relates to a crosslinked product of cyclic olefin resin which has transparency, heat resistance and flexibility and can be used in various fields such as electric and electronic devices or optical devices, and a method for producing the same.
- cyclic olefin resins are excellent in transparency, chemical resistance, moisture resistance, mechanical properties, etc., optical parts such as lenses and optical recording materials, parts for electricity or electronics such as printed circuit boards and connectors, containers for medicines and the like It is used in various fields such as medical or medical equipment supplies such as syringes, experimental instruments such as beakers and optical cells, and automobile parts.
- cyclic olefin resins have characteristics of low flexibility, insufficient moldability, high glass transition temperature, but low softening temperature, so various kinds of them depending on the application. The improvement of is being considered.
- Patent Document 1 JP-A-2005-47991 discloses that an organic peroxide of 0.
- a crosslinkable resin composition is disclosed in which 3 to 2.5 parts by weight, 7 to 30 parts by weight of a coagent, and 5 to 100 parts by weight of an inorganic filler are dispersed.
- a crosslinked molded article having high plating adhesion and solder heat resistance can be obtained by heating the crosslinkable resin composition to crosslink it.
- JP-A-2006-274164 discloses that a molded product made of a cyclic olefin polymer has an acceleration voltage of 50 kV or more and an irradiation dose of 50.
- a method is disclosed in which radiation is irradiated at a surface temperature (Tg-50) to (Tg + 70) ° C. of an irradiated part of ⁇ 1000 kGy.
- Tg-50 surface temperature
- Tg + 70 ° C.
- the cyclic olefin polymer is a polymer containing 10 mol% or more of cyclic olefin units, and is described as preferably having a glass transition temperature of 100 ° C. or more.
- a cyclic olefin polymer having a glass transition temperature of 58 to 140 ° C. is irradiated with ⁇ -rays at a surface temperature of 75 to 180 ° C. of the irradiated portion to produce a molded body without deformation.
- this document does not describe crosslinking.
- Example 2 of Patent Document 2 a sheet is produced in which a cyclic olefin polymer (APEL 8008T) formed of a tetracyclic olefin and having a glass transition temperature of 58 ° C. is irradiated with ⁇ -rays, Even with this sheet, transparency, heat resistance and appropriate flexibility can not be simultaneously achieved.
- a cyclic olefin polymer APEL 8008T
- JP-A-11-340590 Patent Document 3
- 5 to 400 parts by weight of a resin excellent in radiation crosslinkability with the norbornene-based resin and 100% by weight of a thermoplastic norbornene-based resin There is disclosed a laminate for a printed wiring board having a radiation cross-linked structure, having a conductive metal foil in a sheet formed of a resin composition containing 0.1 to 20 parts by weight of an auxiliary.
- high solder heat resistance is imparted by crosslinking a thermoplastic norbornene resin with a radiation crosslinkable resin such as polybutadiene, and the resin is tightly integrated with a metal foil.
- a radiation crosslinkable resin is essential, and the characteristics of the norbornene resin are degraded. Furthermore, the composition is deformed by the irradiation of radiation.
- Japanese Patent No. 3274702 Japanese Patent No. 3274702 (patent document 4)
- a multilayer material consisting of is proposed.
- cyclic olefin copolymer films having a crystallinity of 1%, a glass transition temperature of 2 ° C. or 3 ° C., and a melting point of 81 ° C. or 73 ° C., LLDPE sheet, nylon 6 sheet, polyimide sheet or aluminum plate Is heat laminated.
- cyclic olefin copolymers having a low glass transition temperature lack heat resistance and deform easily, for example, when exposed to high temperatures in the process of using the final product after film forming.
- JP-A-6-345885 Patent Document 5
- Tg glass transition temperature
- the molar percentage of ⁇ -olefin and cyclic olefin is described as 80:20 to 99.9: 0.1.
- the glass transition temperature is preferably ⁇ 30 to 45 ° C. (especially ⁇ 30 to 40 ° C.), and the degree of crystallinity is described as 0 to 40% (especially 0 to 25%).
- An ethylene-norbornene copolymer having a crystallinity of 4.3% is irradiated with ⁇ -rays to produce a sheet.
- this sheet has a large amount of ethylene chains and exhibits crystallinity, and has low transparency. Therefore, it is intended for use in medicine, packaging, food fields such as infusion bags, and the transparency is low, and in particular, it does not have the transparency required in the field of optical elements and the like. Furthermore, this sheet is intended to impart sufficient elasticity and flexibility in the above-mentioned field, and the elasticity is too high and does not have appropriate flexibility.
- an object of the present invention is to provide a crosslinked product of cyclic olefin resin that can achieve both heat resistance and flexibility (especially low temperature softening property) while maintaining high transparency with low haze, and a method for producing the same. It is in.
- Another object of the present invention is a crosslinked product of cyclic olefin resin having high transparency and excellent durability (stability) such as water resistance, weather resistance (especially light resistance) and chemical resistance, and a method for producing the same To provide.
- Still another object of the present invention is to provide a crosslinked product of cyclic olefin resin excellent in moisture resistance and mechanical properties and a method for producing the same.
- Another object of the present invention is to provide a method for easily producing a crosslinked product of a cyclic olefin resin excellent in transparency, heat resistance and flexibility (in particular, low temperature softening property).
- the inventors of the present invention crosslink a specific linear olefin-cyclic olefin copolymer with an electron beam or the like, while maintaining high transparency with low haze.
- the inventors have found that heat resistance and flexibility can be compatible and complete the present invention.
- the crosslinked product of the present invention is a crosslinked product of a chain olefin-cyclic olefin copolymer containing a chain olefin and a cyclic olefin as a polymerization component, wherein the cyclic olefin contains a bicyclic olefin, and the cyclic
- the proportion of the olefin is more than 15 mol% and 40 mol% or less based on the total of the chain olefin and the cyclic olefin, and the glass transition temperature of the chain olefin-cyclic olefin copolymer is 20 to 20 It is 80 ° C.
- a crosslinked product of a chain olefin-cyclic olefin copolymer comprising a chain olefin and a cyclic olefin as a polymerization component, wherein the cyclic olefin contains a bicyclic olefin, and the proportion of the cyclic olefin is And a crosslink having a crystallinity of 15% or less and 40% or less with respect to the total of the chain olefin and the cyclic olefin and having a crystallinity of the chain olefin-cyclic olefin copolymer of 1% or less
- the body is also included.
- the crystallinity of the linear olefin-cyclic olefin copolymer may be 0.5% or less.
- the crosslinked product of the present invention may have a haze of 2% or less (in particular, 0.1 to 1.5%) in accordance with JIS K7136.
- the glass transition temperature of the linear olefin-cyclic olefin copolymer may be about 30 to 50.degree.
- the crosslinked body of the present invention may have a breaking elongation of 10% or more (in particular, 100 to 400%) at a thickness of 100 ⁇ m in accordance with JIS K7127.
- the gel fraction measured by a method of refluxing with toluene for 3 hours may be 5% by weight or more (particularly 70% by weight or more).
- the crosslinked product of the present invention may have a storage modulus of 100 to 4000 MPa at a temperature of 25 ° C., a storage modulus of 0.01 to 10 MPa at a temperature of 80 ° C., and a molecular weight between crosslinking points of 8,000 to 30,000.
- the crosslinked body of the present invention may be a crosslinked body substantially free of a resin having a crosslinkable group and a crosslinking agent.
- the crosslinked body of the present invention may be an electron beam crosslinked body.
- the crosslinked body of the present invention is in the form of a sheet and may be a sealing material for an optical element.
- the present invention also includes a method for producing a crosslinked product by crosslinking a linear olefin-cyclic olefin copolymer with an electron beam or radiation.
- crosslinking may be performed with an electron beam without heating, and in particular, may be performed with an accelerating voltage of 150 kV or more and an irradiation dose of 200 kGy or more.
- “flexibility” or “moderate flexibility” does not mean softness or elasticity such as rubber or elastomer which can be expanded or deformed at normal temperature or around room temperature, but normal temperature or around room temperature In the above, it means that it is hard (non-elastic) but softens at a relatively low temperature (eg, about 30 to 80 ° C., preferably about 40 to 70 ° C., more preferably about 45 to 60 ° C.).
- “low temperature softening property” means that the film softens at a temperature of about 30 to 80 ° C., and the elastic modulus after softening becomes 100% or less of that before the softening.
- the specific linear olefin-cyclic olefin copolymer is crosslinked by an electron beam or the like, heat resistance and flexibility (especially low temperature softening) are maintained while maintaining high transparency with low haze. Can be compatible. Furthermore, this crosslinked body is high in transparency, excellent in water resistance, weather resistance (especially light resistance), and durability such as chemical resistance, and also excellent in moisture resistance and mechanical properties. Further, in the present invention, a crosslinked product of cyclic olefin resin excellent in transparency, heat resistance and flexibility can be easily produced.
- the crosslinked product of the present invention is a crosslinked product of a cyclic olefin resin (a chain olefin-cyclic olefin copolymer) containing a chain olefin and a cyclic olefin as a polymerization component.
- a cyclic olefin resin a chain olefin-cyclic olefin copolymer
- the cyclic olefin resin (uncrosslinked cyclic olefin resin) in the present invention contains a chain olefin and a cyclic olefin as a polymerization component.
- chain olefins examples include chain C such as ethylene, propylene, 1-butene, isobutene, 1-pentene, 3-methyl-1-pentene, 4-methyl-1-pentene, 1-hexene, 1-octene and the like. 2-10 olefins etc. are mentioned. These linear olefins can be used alone or in combination of two or more. Among these chain olefins, preferred are ⁇ -chain C 2-8 olefins, and more preferred are ⁇ -chain C 2-4 olefins (especially ethylene).
- the cyclic olefin is a polymerizable cyclic olefin having an ethylenic double bond in the ring, and includes bicyclic olefins.
- Examples of representative bicyclic olefins include norbornene (2-norbornene) which may have a substituent, octalin (octahydronaphthalene) which may have a substituent, and the like.
- substituents examples include an alkyl group, an alkenyl group, an aryl group, a hydroxyl group, an alkoxy group, a carboxyl group, an alkoxycarbonyl group, an acyl group, a cyano group, an amide group and a halogen atom. These substituents may be used alone or in combination of two or more.
- bicyclic olefins for example, 2-norbornene; 5-methyl-2-norbornene, 5,5-dimethyl-2-norbornene, 5-ethyl-2-norbornene, 5-butyl-2-norbornene
- Norbornenes having an alkyl group such as; norbornenes having an alkenyl group such as 5-ethylidene-2-norbornene; 5-methoxycarbonyl-2-norbornene, 5-methyl-5-methoxycarbonyl Norbornenes having an alkoxycarbonyl group such as -2-norbornene; norbornenes having a cyano group such as 5-cyano-2-norbornene; 5-phenyl-2-norbornene, 5-phenyl-5-methyl-2-norbornene, etc.
- Norbornenes having an aryl group of: octalin; 6-D Examples include octalin having an alkyl group such as chill
- bicyclic olefins can be used alone or in combination of two or more.
- norbornenes such as norbornene and norbornene having an alkyl group (C 1-4 alkyl group such as methyl group and ethyl group) are preferable.
- the cyclic olefin may contain a bicyclic olefin, and may further contain a monocyclic olefin and / or a polycyclic olefin having three or more rings.
- monocyclic olefins include cyclic C 4-12 cycloolefins such as cyclobutene, cyclopentene, cycloheptene and cyclooctene.
- polycyclic olefins examples include dicyclopentadiene; 2,3-dihydrodicyclopentadiene, methanooctahydrofluorene, dimethanooctahydronaphthalene, dimethanocyclopentadienonaphthalene, methanooctahydrocyclopentadienonaphthalene and the like Derivatives of 6-ethyl-octahydronaphthalene etc .; adducts of cyclopentadiene with tetrahydroindene etc., 3- to 4-mer of cyclopentadiene etc.
- bicyclic olefins are contained as cyclic olefins, it may be because bicyclic olefins (particularly, the above-mentioned norbornenes such as norbornene) have a suitable bulk, or in a specific ratio to chain olefins When combined and crosslinked, a novel polymer is obtained which has properties (i.e., properties compatible with low temperature softening, heat resistance and transparency) which can not be achieved by the conventional polymers.
- the proportion of bicyclic olefin may be 10 mol% or more, for example, 30 mol% or more, preferably 50 mol% or more, and more preferably 80 mol% or more with respect to the whole cyclic olefin. In particular, it may be 90 mol% or more) and may be a bicyclic olefin alone (100 mol%).
- the proportion of bicyclic olefins is small and the proportion of polycyclic olefins having three or more rings (particularly, polycyclic olefins having four or more rings) is large, the composition becomes rigid and the low temperature softening property and the heat resistance can not be compatible.
- the proportion of the bicyclic olefin is small and the proportion of the monocyclic olefin is large, the low temperature softening property and the heat resistance can not be compatible.
- a chain olefin (especially an ⁇ -chain C 2-4 olefin such as ethylene) and a cyclic olefin (especially norbornene etc.) from the viewpoint of achieving both transparency and flexibility in the chain olefin-cyclic olefin copolymer
- the ratio (molar ratio) with respect to (polycyclic olefin) of (1) is that the ratio of cyclic olefin is more than 15 mol% and 40 mol% or less with respect to the total of the chain olefin and the cyclic olefin.
- the balance between the flexibility and the heat resistance is excellent, and the generation of haze (particularly, internal haze) can be suppressed, and the transparency can be improved.
- copolymerizable monomers include, for example, vinyl ester monomers (eg, vinyl acetate, vinyl propionate, etc.); diene monomers (eg, butadiene, isoprene, etc.); (meth) acrylics Monomers [for example, (meth) acrylic acid or derivatives thereof ((meth) acrylic acid ester etc.) and the like] can be exemplified. These other copolymerizable monomers may be used alone or in combination of two or more. The content of these other copolymerizable monomers is, for example, 5 mol% or less, preferably 1 mol% or less, relative to the copolymer.
- the linear olefin-cyclic olefin copolymer may be a resin obtained by addition polymerization, or may be a resin obtained by ring opening polymerization (ring opening metathesis polymerization, etc.).
- the polymer obtained by the ring-opening metathesis polymerization may be a hydrogenated resin.
- the polymerization method of the linear olefin-cyclic olefin copolymer may be a conventional method, for example, ring-opening metathesis polymerization using a metathesis polymerization catalyst, addition polymerization using a Ziegler-type catalyst, addition polymerization using a metallocene-based catalyst (usually And ring opening metathesis polymerization) using a metathesis polymerization catalyst.
- the linear olefin-cyclic olefin copolymer is amorphous, and the degree of crystallinity is 0 to 3%, preferably 0 to 1%, more preferably 0 to 0.5% (particularly 0 to 0.1%). It is an extent.
- the copolymer since the copolymer is amorphous, it is excellent in transparency (light guiding property), and the generation of haze in the crosslinked product can be suppressed.
- a crosslinked product in which cyclic olefins (particularly norbornenes) and linear olefins are combined in a predetermined ratio has a crystallinity of about 0% (eg, 0.5% or less, preferably 0.1% or less, and further, Preferably, it is amorphous at 0%) and exhibits excellent transparency since almost no internal haze is observed.
- the cross-linked product of the present invention is non-crystalline having a crystallinity of approximately 0% as described above, when the crystallinity is measured by the following measurement method, crystalline portions are obtained by the method of setting the baseline. In some cases,
- the crystallinity degree can be calculated by performing fitting of a crystalline portion (peak) and an amorphous portion (halo) using an X-ray diffraction method and substituting each integrated intensity into the following equation.
- X represents the crystalline scattering integral intensity (scattering integral intensity derived from the crystalline portion)
- Y represents the amorphous scattering integral intensity (scattering integral intensity derived from the amorphous portion).
- the glass transition temperature (Tg) of the linear olefin-cyclic olefin copolymer (before crosslinking) can be selected from the range of about 10 to 100 ° C., but it is preferably 20 to 80 ° C. from the viewpoint of being able to impart appropriate flexibility.
- the temperature is about 25 to 55 ° C., more preferably about 25 to 75 ° C. (particularly about 30 to 45 ° C.).
- the glass transition temperature is, for example, 15 by combining cyclic olefins (especially norbornenes) and chain olefins in the above proportion, from the viewpoint of achieving a high degree of compatibility between flexibility (especially low temperature softening) and heat resistance.
- the temperature is about 50 to 50 ° C.
- the number average molecular weight of the linear olefin-cyclic olefin copolymer is, for example, about 1000 to 150000, preferably about 5000 to 120000, and more preferably about 10000 to 100000 (particularly about 20000 to 90000).
- the glass transition temperature and the melting point can be controlled by adjusting the proportion of the monomer, the substituent of the monomer, the molecular weight of the polymer, and the like.
- another olefin resin crosslinkable with the cyclic olefin resin may be contained.
- the crosslinking density can be adjusted to control flexibility and heat resistance.
- the other olefin resin is not particularly limited as long as it can be crosslinked with the cyclic olefin resin, and a chain olefin resin, a cyclic olefin resin other than the cyclic olefin resin (other cyclic olefin resins) Etc.
- Examples of the chain olefin resin include polymers containing the chain olefin exemplified in the section of the cyclic olefin resin, in particular, an ⁇ -chain C 2-4 olefin such as ethylene and propylene (particularly ethylene). .
- Examples of chain-like olefin resins include polyethylene resins, polypropylene resins, and poly (methylpentene-1) resins. These linear olefin resins can be used alone or in combination of two or more. Among these linear olefin resins, polyethylene resins such as low, medium or high density polyethylene and linear low density polyethylene are preferable.
- the ratio of cyclic olefin can use cyclic olefin resin which exceeds 40 mol% with respect to the sum total of linear olefin and cyclic olefin.
- the ratio (molar ratio) of the chain olefin to the cyclic olefin is, for example, about 50/50 to 0/100, preferably about 40/60 to 10/90.
- Other cyclic olefin resins can also be used alone or in combination of two or more. Among these other cyclic olefin resins, a norbornene-ethylene copolymer having a ratio of norbornene to ethylene in the above range is preferable.
- the glass transition temperature of the other olefin resin can be selected from the range of about -150 ° C. to 200 ° C. according to the type of the olefin resin, and in order to adjust the glass transition temperature of the cyclic olefin resin, cyclic olefin resin Other cyclic olefin resins having a glass transition temperature higher than that of the resin (for example, a glass transition temperature exceeding 100 ° C., about 120 to 200 ° C.), and polyethylene resins having a glass transition temperature lower than the cyclic olefin resin (for example, A glass transition temperature of less than 10 ° C., for example, about ⁇ 110 to 0 ° C., preferably about ⁇ 80 to ⁇ 5 ° C., and more preferably about ⁇ 50 to about ⁇ 10 ° C. may be used.
- the number average molecular weight of the other olefin resin is, for example, about 5,000 to 300,000, preferably about 10,000 to 200,000, and more preferably about 15,000 to 150,000.
- the crosslinked body of the present invention is obtained by crosslinking the cyclic olefin resin, and has moderate flexibility and high heat resistance.
- a soft resin has a low glass transition temperature and is flexible but does not have sufficient heat resistance. That is, in the resin, flexibility (especially low temperature softening) and heat resistance are in a trade-off relationship, and it was extremely difficult to establish both simultaneously.
- the present invention is characterized in that appropriate flexibility and heat resistance are made compatible by crosslinking a specific cyclic olefin resin having a cyclic olefin proportion appropriately adjusted with an electron beam or the like. Do.
- the glass transition temperature of the crosslinked product can be selected from the range of about 10 to 100 ° C., for example, about 15 to 90 ° C., preferably 20 to 80 ° C., and more preferably about 25 to 75 ° C. (especially 25 to 50 ° C.).
- the rise in the glass transition temperature is small even after crosslinking, and the temperature difference with the glass transition temperature before crosslinking may be 50 ° C. or less, for example, 0 to 40 ° C., preferably 0 to 30. C., more preferably 0 to 20.degree. C. (particularly 0 to 10.degree. C.) and maintaining high flexibility even after crosslinking.
- the glass transition temperature at which low temperature softening property can be exhibited can be adjusted, and the glass transition temperature is 25 to 55 ° C., for example.
- the temperature may preferably be about 30 to 50 ° C., more preferably about 30 to 45 ° C. (particularly about 30 to 40 ° C.).
- the crosslinked product may have a breaking elongation of about 10% or more, for example, 50 to 1000%, preferably 80 to 500% (eg, 80 to 500%) in a tensile test (film with a thickness of 100 ⁇ m) according to JIS K7127. 100 to 500%), more preferably about 100 to 400% (especially 250 to 350%). Furthermore, since the crosslinked body of the present invention exhibits elastic deformability, it is preferable that the tensile test does not show a yield point.
- the heat resistance of the crosslinked product can be indicated by the linear thermal expansion coefficient at 140 to 150.degree.
- the linear thermal expansion coefficient at 140 to 150 ° C. may be 2000 ppm / ° C. or less (eg, 1 to 2000 ppm / ° C.), for example, 5 to 1000 ppm / ° C., preferably 10 to 800 ppm / ° C. More preferably, it is about 50 to 500 ppm / ° C. (particularly about 100 to 400 ppm / ° C.).
- the crosslinked product does not melt even at a high temperature of 140 to 150 ° C., exhibits a suitable linear thermal expansion coefficient, and maintains excellent heat resistance.
- the crosslinked product of the present invention is suitably crosslinked in order to achieve both heat resistance and flexibility (especially low temperature softening).
- the degree of crosslinking in the crosslinked product can be indicated by the gel fraction measured by a method of refluxing with toluene for 3 hours.
- the gel fraction of the crosslinked product may be, for example, 5% by weight or more, and for example, 10 to 99% by weight (eg, 30 to 98% by weight), preferably 50 to 97% by weight, more preferably 80 to It may be about 95% by weight (particularly 85 to 93% by weight).
- the gel fraction can be measured by the measurement method described in the examples.
- the crosslink density can be controlled to the irradiation conditions of electron beam and radiation, but by adjusting the proportion of the cyclic olefin to a specific range (in particular, the proportion of the cyclic olefin and the chain olefin is the above
- the gel fraction can be adjusted to 70% by weight or more, preferably 80% by weight or more (particularly 85% by weight or more).
- the crosslink density of the crosslinker is increased, and the heat resistance and the durability are improved, but the flexibility is maintained at an appropriate level probably because the proportion of the cyclic olefin is appropriately adjusted.
- the crosslinked product of the present invention (in particular, a crosslinked product of a copolymer in which a cyclic olefin and a chain olefin are combined in the above ratio) has a storage elastic modulus of 100 to 4000 MPa, preferably 500 to 3000 MPa at a temperature of 25 ° C. And more preferably about 1000 to 2000 MPa (eg, about 1200 to 1800 MPa).
- the storage elastic modulus at a temperature of 50 ° C. is about 5 to 500 MPa, preferably 10 to 300 MPa (eg, 20 to 280 MPa), and more preferably about 30 to 250 MPa (eg, 50 to 220 MPa).
- the storage elastic modulus at 80 ° C. is “1”, the storage elastic modulus at 25 ° C. is, for example, 0.05 ⁇ 10 3 to 10 ⁇ 10 3 with respect to the storage elastic modulus at 80 ° C.
- the storage modulus of the crosslinked product can be measured by the method described in the examples.
- the crosslinked product of the present invention (in particular, a crosslinked product of a copolymer in which a cyclic olefin and a chain olefin are combined in the above ratio) has a large molecular weight between crosslinking points, for example, 8,000 to 30,000, preferably 9,000 to 25,000. (For example, 9500 to 20000), and more preferably about 10000 to 18000 (for example, 10000 to 16000).
- a large inter-crosslink molecular weight indicates that the crosslinker has a loosely crosslinked structure with a low crosslink density.
- the crosslinked body behaves like a thermoplastic resin and flows when heated, the flow and deformation of the crosslinked body are regulated by crosslinking when the temperature is higher than a predetermined temperature, and unlike the thermoplastic resin, it has heat resistance. Therefore, when the molecular weight between crosslinking points is too small, the flowability decreases, and when the molecular weight between crosslinking points is too large, the heat resistance to flow deformation decreases.
- the molecular weight between crosslinking points of the crosslinked body can be determined by a conventional method, for example, a typical method using the rubber elasticity theory. In this method, the molecular weight between crosslinking points can be calculated by the following equation.
- G ( ⁇ RT) / M X (Wherein G is shear modulus (unit Pa), ⁇ is density (g / m 3 ), R is gas constant (8.314 J / K / mol), T is absolute temperature (K), and M X is crosslinking Indicates point-to-point molecular weight (g / mol)
- the shear modulus G can be measured by the storage modulus in a rubbery flat area (for example, 140 ° C., angular frequency 0.1 Hz) (the method of measuring the storage modulus is the same as above).
- the density ⁇ can be measured by the Archimedes method, and the density of the polymer described in the book “Polymer Engineering and Science, MID-JULY, 1990, Vol. 30, No. 13, P753-761” can also be referred to.
- the crosslinked product of the present invention is also excellent in transparency, and the haze (clouding value) may be, for example, 5% or less, preferably 2% or less (for example, 0) in a method according to JIS K7105. And more preferably about 0.1 to 1.5% (particularly 0.2 to 1%).
- the proportion of the cyclic olefin in the cyclic olefin resin is appropriately adjusted, both the appropriate flexibility and high heat resistance can be achieved as described above, and the cyclic olefin resin is amorphous.
- the transparency or the light guiding property is also high, and the generation of haze can be suppressed.
- haze can be measured at a thickness of about 100 ⁇ m.
- the haze includes external haze caused by asperities and the like on the surface of the measurement sample (film) and internal haze caused by microcrystals present in the film.
- there is almost no internal haze and may show a haze of about 2% or less depending on the external haze of the film surface, but since there is almost no internal haze, the haze does not increase even when the thickness is increased.
- the total light transmittance of the crosslinked product of the present invention is, for example, 80% or more, preferably 80 to 99%, more preferably 85 to 98% (particularly 90 to 95%) in a method (thickness 100 ⁇ m) according to JIS K7105. ) May be.
- the ratio of light intensity at 454 nm to light intensity at 605 nm (454 nm / 605 nm) may be 3.0 or more, for example 3.0 to 3.7, preferably 3.1 to 3.7, More preferably, it is about 3.2 to 3.7.
- the form of the crosslinked product of the present invention is not particularly limited, but when it is in the form of a film, the thickness of the film is about 20 to 400 ⁇ m, preferably 30 to 350 ⁇ m, more preferably 40 to 300 ⁇ m (eg 50 to 200 ⁇ m). It may be about 100 ⁇ m or more (eg, 100 to 400 ⁇ m), preferably about 150 ⁇ m or more (eg, 200 to 350 ⁇ m).
- the cross-linked product of the present invention may be a conventional additive such as a cross-linking agent, a cross-linking accelerator, a cross-linking aid, an antioxidant, a heat stabilizer, a light stabilizer, a stabilizer such as a UV absorber, a plasticizer, You may contain the inhibitor, a flame retardant, etc.
- a cross-linking agent such as a cross-linking agent, a cross-linking accelerator, a cross-linking aid, an antioxidant, a heat stabilizer, a light stabilizer, a stabilizer such as a UV absorber, a plasticizer, You may contain the inhibitor, a flame retardant, etc.
- the crosslinked body of the present invention may be substantially free of a resin having a crosslinkable group (eg, a group having an ethylenically unsaturated bond, etc.). Furthermore, the crosslinker of the present invention may be substantially free of a crosslinker, a crosslinker, and a crosslinker in order to crosslink using an electron beam.
- a crosslinkable group eg, a group having an ethylenically unsaturated bond, etc.
- the crosslinked body of the present invention is obtained by crosslinking the cyclic olefin resin, and the method of crosslinking is not particularly limited, and active rays such as ultraviolet rays, beta ( ⁇ ) rays, gamma ( ⁇ ) rays, X rays, etc. Radiation (especially gamma rays) may be used, but it is easy to control and produced by crosslinking with high energy rays (electron beam or gamma rays) from the viewpoint of easy preparation of a novel crosslinked body having the above characteristics. It is also good.
- the cyclic olefin resin can be crosslinked at normal temperature (for example, a temperature of about 10 to 30 ° C.) without heating, and the crosslinking density can also be improved.
- a method of irradiating an electron beam for example, a method of irradiating an electron beam by an exposure source such as an electron beam irradiation device can be used.
- the irradiation dose (dose) varies depending on the thickness of the cyclic olefin resin, but can be selected, for example, from the range of about 10 to 500 kGy (gray) (for example, 100 to 400 kGy), but the crosslink density is increased to improve heat resistance. From the point of view, it may be 200 kGy or more, for example, about 200 to 500 kGy, preferably about 220 to 450 kGy, and more preferably about 230 to 430 kGy (particularly about 250 to 400 kGy).
- the acceleration voltage can be selected from the range of about 10 to 1000 kV (for example, 100 to 500 kV), but may be 150 kV or more from the viewpoint of improving heat resistance, for example, 160 to 400 kV, preferably 170 to 300 kV, More preferably, it may be about 180 to 250 kV.
- a method of irradiating a gamma ray for example, a method of irradiating a gamma ray by an exposure source such as a gamma ray irradiation device can be used.
- the irradiation dose (dose) varies depending on the thickness of the cyclic olefin resin, but can be selected, for example, from the range of about 10 to 500 kGy (gray) (for example, 100 to 400 kGy), but the crosslink density is increased to improve heat resistance.
- it may be 200 kGy or more, for example, about 200 to 500 kGy, preferably about 220 to 450 kGy, and more preferably about 230 to 430 kGy (particularly about 250 to 400 kGy).
- irradiation with an electron beam or radiation may be performed in air, and may be performed in an inert gas (for example, nitrogen gas, argon gas, helium gas, etc.) atmosphere if necessary.
- an inert gas for example, nitrogen gas, argon gas, helium gas, etc.
- the crosslinked product of the present invention can be obtained by using a conventional molding method for cyclic olefin resins, such as injection molding, extrusion molding, blow molding, vacuum molding, profile molding, injection pressing, press molding, gas injection molding
- a molded product having a desired shape can be obtained by crosslinking after forming into a shape (film or sheet, various three-dimensional shapes, etc.) according to the application by a method, compression molding, transfer molding, etc. .
- the test piece obtained in the example was cut into a strip having a thickness of 200 ⁇ m, a width of 2 cm, and a length of 8 cm.
- White light is made incident from the cut-out end of the strip by a white LED (manufactured by Nichia Corporation, trade name: NSPB 500S), and the light is transmitted through the film (optical path length: 8 cm), and from the other end
- the visible light spectrum of the emitted light was measured using a spectrophotometer (manufactured by Hamamatsu Photonics Co., Ltd., multi-channel spectrometer: PMA-11). Moreover, the hue of the emitted light was confirmed visually.
- the white LED used this time had a peak derived from the blue LED at 454 nm, and a broad spectrum of the fluorescent material was observed at a long wavelength of 500 nm or later.
- Light intensity ratio light intensity at 454 nm / light intensity at 605 nm.
- Linear expansion coefficient The test pieces obtained in the examples were subjected to linear expansion at 140 ° C. to 150 ° C. using a thermomechanical analyzer (EXSTAR TMA / SS 7100 manufactured by SII Nano Technology Inc.) in accordance with JIS K7197. The coefficients were measured.
- the density ⁇ (g / m 3 ) was 1.02.
- the polymer solution was poured into 15 liters of methanol to precipitate a polymer.
- the polymer was separated by filtration and dried to obtain cyclic olefin resin A (ethylene-norbornene copolymer A).
- the yield was 3.12 kg and the polymerization activity was 46 kg / g Zr (yield per 1 g of zirconium).
- EB irradiation apparatus Icon manufactured by Iwasaki Electric Co., Ltd. “TYPE
- Example 1 Instead of cyclic olefin resin A, cyclic olefin resin (trade name “TOPAS9903”, manufactured by Topas Advanced Polymers GmbH, number average molecular weight 69000, glass transition temperature 33 ° C., norbornene content 20 mol%, crystallinity 0%)
- a film-shaped test piece was produced in the same manner as in Comparative Example 1 except that the electron beam was irradiated at an accelerating voltage of 200 kV and a dose of 250 kGy. The light emitted from the test piece was white because it was an amorphous polymer.
- the storage elastic modulus at 25 ° C. was 1480 MPa
- the storage elastic modulus at 80 ° C. was 2.99 MPa
- the molecular weight between crosslinking points was 13,000.
- Example 2 A film-shaped test piece was produced in the same manner as in Example 1 except that the electron beam was irradiated under the conditions of an accelerating voltage of 200 kV and a dose of 350 kGy. The light emitted from the test piece was white because it was an amorphous polymer. Furthermore, the storage elastic modulus at a temperature of 25 ° C. was 1520 MPa, the storage elastic modulus at a temperature of 80 ° C. was 3.04 MPa, and the molecular weight between crosslinking points was 11,000.
- Example 3 A film-shaped test piece was produced in the same manner as in Example 1 except that the electron beam was irradiated under the conditions of an accelerating voltage of 200 kV and a dose of 150 kGy. The light emitted from the test piece was white because it was an amorphous polymer. Furthermore, the storage elastic modulus at 25 ° C. was 1510 MPa, the storage elastic modulus at 80 ° C. was 2.98 MPa, and the molecular weight between crosslinking points was 15000.
- Example 4 Instead of cyclic olefin resin A, cyclic olefin resin (trade name "TOPAS9506” manufactured by Topas Advanced Polymers GmbH, number average molecular weight 66000, glass transition temperature 70 ° C, norbornene content 32 mol%, crystallinity 0%) A film-like test piece was produced in the same manner as in Comparative Example 1 except for using. The light emitted from the test piece was white because it was an amorphous polymer.
- TOPAS9506 manufactured by Topas Advanced Polymers GmbH
- Example 5 The same as Example 1, except that irradiation is performed at a dose of 350 kGy using gamma ray irradiation apparatus (Nordion "JS10000HD", source cobalt -60, under atmosphere, normal temperature (in-chamber temperature 40 ° C) instead of electron beam irradiation.
- gamma ray irradiation apparatus Nedion "JS10000HD", source cobalt -60, under atmosphere, normal temperature (in-chamber temperature 40 ° C) instead of electron beam irradiation.
- JS10000HD gamma ray irradiation apparatus
- Comparative example 2 Instead of cyclic olefin resin A, cyclic olefin resin (trade name "TOPAS 8007" manufactured by Topas Advanced Polymers GmbH, number average molecular weight 51000, glass transition temperature 80 ° C., norbornene content 42 mol%, crystallinity 0%) A film-like test piece was produced in the same manner as in Comparative Example 1 except for using. The light emitted from the test piece was white because it was an amorphous polymer.
- TOPAS 8007 manufactured by Topas Advanced Polymers GmbH
- Comparative example 3 Accelerated using cyclic olefin resin (trade name "TOPAS6013" manufactured by Topas Advanced Polymers GmbH, glass transition temperature 130 ° C, norbornene content 50 mol%, crystallinity 0%) instead of cyclic olefin resin
- a film-shaped test piece was produced in the same manner as in Comparative Example 1 except that the electron beam was irradiated at a voltage of 200 kV and a dose of 250 kGy. The light emitted from the test piece was white because it was an amorphous polymer.
- the crosslinked product of the present invention is high in transparency and excellent in mechanical properties.
- the crosslinked product of the present invention can be used for molding materials in various fields, such as optical materials, electric and electronic materials, electric insulating materials, automobile parts materials, medical materials, construction and civil engineering materials and the like. Furthermore, since the crosslinked body of the present invention can simultaneously achieve both heat resistance and flexibility and is excellent in transparency, various electric / electronic devices or optical devices, for example, switch members such as portable devices, home appliances, and control devices It can be used as Specifically, members such as mobile phones, gaming machines, mobile devices, touch panels, car navigation systems, watches, calculators, televisions, personal computers (for example, key top sheets, key mat sheets, light guide sheets, reflective sheets, OCA It is also useful as a tape (such as high transparency adhesive transfer tape or coreless tape for optics).
- switch members such as portable devices, home appliances, and control devices
- members such as mobile phones, gaming machines, mobile devices, touch panels, car navigation systems, watches, calculators, televisions, personal computers (for example, key top sheets, key mat sheets, light guide sheets, reflective sheets, OCA
- the cross-linked body of the present invention is a material having a novel property of achieving both high transparency, low temperature softening property and heat resistance, and an optical sealing material (for example, OCA tape, organic electroluminescence (EL) sealing) Especially suitable for
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Abstract
Description
本発明における環状オレフィン系樹脂(未架橋環状オレフィン系樹脂)は、鎖状オレフィンと環状オレフィンとを重合成分として含む。
前記環状オレフィン系樹脂に加えて、前記環状オレフィン系樹脂と架橋可能な他のオレフィン系樹脂が含まれていてもよい。本発明では、他のオレフィン系樹脂を用いることにより、架橋密度を調整して柔軟性や耐熱性を制御できる。他のオレフィン系樹脂としては、前記環状オレフィン系樹脂と架橋可能であれば、特に限定されず、鎖状オレフィン系樹脂、前記環状オレフィン系樹脂以外の環状オレフィン系樹脂(他の環状オレフィン系樹脂)などが挙げられる。
本発明の架橋体は、前記環状オレフィン系樹脂を架橋することにより得られ、適度な柔軟性を有するともに、高い耐熱性も有している。通常、軟質樹脂は、ガラス転移温度が低く、柔軟ではあるものの、耐熱性が充分でない。すなわち、樹脂において、柔軟性(特に低温軟化性)と耐熱性とはトレードオフの関係にあり、両者を同時に成立するのは極めて困難であった。これに対して、本発明では、環状オレフィンの割合を適度に調整した特定の環状オレフィン系樹脂を電子線などで架橋することにより、適度な柔軟性と耐熱性とを両立させたことを特徴とする。
(式中、Gは剪断弾性率(単位Pa)、ρは密度(g/m3)、Rはガス定数(8.314J/K/モル)、Tは絶対温度(K)、MXは架橋点間分子量(g/モル)を示す)
前記剪断弾性率Gはゴム状平坦域(例えば、140℃、角周波数0.1Hz)における貯蔵弾性率により測定できる(貯蔵弾性率の測定方法は上記と同様である)。また、密度ρはアルキメデス法で測定でき、成書「Polymer Engineering and Science, MID-JULY, 1990, Vol.30, No13, P753-761」に記載された重合体の密度を参照することもできる。
本発明の架橋体は、前記環状オレフィン系樹脂を架橋することにより得られ、架橋の方法は特に限定されず、紫外線などの活性光線やベータ(β)線やガンマ(γ)線、X線などの放射線(特にガンマ線)などであってもよいが、制御し易く、前記特性を有する新規な架橋体を調製し易い点から、高エネルギー線(電子線やガンマ線)で架橋することにより製造してもよい。特に、電子線で架橋すると、加熱による酸化を抑制できるためか、黄変などを防止でき、透明性に優れた架橋体が得られる。本発明では、高エネルギーである電子線を用いるため、架橋剤や架橋促進剤(助剤)が不要であり、安定性の高い架橋体を効率良く製造できる。特に、電子線の照射において、加熱することなく、常温(例えば、10~30℃程度の温度)で環状オレフィン系樹脂を架橋でき、架橋密度も向上できる。
示差走査熱量計(セイコー電子工業(株)製「DSC6200」)を用い、窒素気流下、昇温速度10℃/分で測定を行った。
500mgの試験片を秤り取って冷却管を備えた100mlのナス型フラスコに入れ、さらにトルエン50mlを加えて、還流温度にて3時間攪拌した。その後、混合液を濾過し、濾過残渣を減圧乾燥後、計量してゲル分率を求めた。
得られたフィルムについて、X線回折装置(XRD、(株)リガク製「RINT1500」)を用いて広角X線測定を行った。詳しくは、CuKαを用いて2θ=0°~60°の範囲で回折ピーク測定を行った。
実施例で得られた試験片について、JIS K 7136に準拠して、ヘーズメーター(日本電色工業(株)製、NDH-500)を用いて、ヘーズを測定した。
実施例で得られた試験片について、流れ(MD)方向にJIS2号ダンベル片(幅6mm)を打ち抜き、23℃/50%RH、引張速度500mm/分で引張試験を行った。
実施例で得られた試験片を厚さ200μm、幅2cm、長さ8cmの短冊状に切り出した。その短冊の切り出した端部から白色LED(日亜化学工業(株)製、商品名:NSPB500S)により白色光を入射させ、フィルム中を透過(光路長:8cm)し、もう一方の端部から出射した光を分光光度計(浜松ホトニクス(株)製、マルチチャンネル分光器:PMA-11)を使用して可視光スペクトルを測定した。また、目視によって出射光の色相を確認した。今回使用した白色LEDは454nmに青色LEDに由来するピークを持ち、500nm以降の長波長に蛍光物質による幅広いスペクトルが見られた。白色LED単体の454nmと青色の補色である605nmとの光強度比は3.7であった。光強度比が3.7に近いものほどスペクトルの再現性が良い、優れた導光性能を有するといえる。
実施例で得られた試験片について、JIS K7197に準拠して、熱機械的分析装置(エスアイアイ・ナノテクノロジー(株)製、EXSTAR TMA/SS7100)を用いて、140℃から150℃の線膨張係数を測定した。
実施例及び比較例の試験片について、幅5mm、長さ50mmに切り出し、動的粘弾性測定装置(ティー・エイ・インスツルメント・ジャパン(株)製、RSA-III)を用い、チャック間距離20mm、昇温速度5℃/分及び角周波数10Hzの条件で、貯蔵弾性率(E’)を測定した。
架橋点間分子量は、前記粘弾性測定で得られた温度140℃、角周波数0.1Hzでのデータを、前記架橋点間分子量の算出式(G=(ρRT)/MX)に代入して算出した。なお、密度ρ(g/m3)は1.02とした。
窒素雰囲気下、室温において30リットルのオートクレーブに、トルエン15リットル、トリイソブチルアルミニウム(TIBA)15ミリモル、四塩化ジルコニウム0.75ミリモル、テトラキス(ペンタフルオロフェニル)硼酸アニリニウム0.75ミリモルをこの順番に投入し、続いてノルボルネンを70重量%含有するトルエン溶液1.8リットルを加えた。50℃に昇温した後、エチレン分圧が5kgf/cm2になるように、連続的にエチレンを導入しつつ、60分間の反応を行った。反応終了後ポリマー溶液を15リットルのメタノール中に投入し、ポリマーを析出させた。このポリマーを濾別、乾燥し、環状オレフィン系樹脂A(エチレン-ノルボルネン共重合体A)を得た。収量は3.12kg、重合活性は46kg/gZr(ジルコニウム1g当りの収量)であった。
製造例1で得られた環状オレフィン系樹脂Aを用いて、小型押出機((株)プラスチック工学研究所製、20mmφ、L/D=25)に巾150mmのTダイを取り付け、押出温度200℃、チルロール温度10℃、引取速度を調整し、厚み100μmのフィルム状試験片を作製した。得られた試験片に、窒素雰囲気中、常温で、EB照射装置(岩崎電気(株)製「TYPE;CB250/15/180L」)を用いて、加速電圧200kV、線量350kGyで電子線を照射して架橋した。白色LEDを導光させてみたが、結晶性ポリマーであるためレイリー散乱が起こり、試験片からの出射光は橙色に着色していた。
環状オレフィン系樹脂Aの代わりに、環状オレフィン系樹脂(Topas Advanced Polymers GmbH社製、商品名「TOPAS9903」、数平均分子量69000、ガラス転移温度33℃、ノルボルネン含量20モル%、結晶化度0%)を用いて、加速電圧200kV、線量250kGyで電子線を照射する以外は比較例1と同様にして、フィルム状試験片を作製した。試験片からの出射光は非晶性ポリマーであるため白色であった。さらに、温度25℃での貯蔵弾性率は1480MPa、80℃での貯蔵弾性率2.99MPa、架橋点間分子量13000であった。
加速電圧200kV、線量350kGyの条件で電子線を照射する以外は、実施例1と同様にして、フィルム状試験片を作製した。試験片からの出射光は非晶性ポリマーであるため白色であった。さらに、温度25℃での貯蔵弾性率は1520MPa、80℃での貯蔵弾性率3.04MPa、架橋点間分子量11000であった。
加速電圧200kV、線量150kGyの条件で電子線を照射する以外は、実施例1と同様にして、フィルム状試験片を作製した。試験片からの出射光は非晶性ポリマーであるため白色であった。さらに、温度25℃での貯蔵弾性率は1510MPa、80℃での貯蔵弾性率2.98MPa、架橋点間分子量15000であった。
環状オレフィン系樹脂Aの代わりに、環状オレフィン系樹脂(Topas Advanced Polymers GmbH社製、商品名「TOPAS9506」、数平均分子量66000、ガラス転移温度70℃、ノルボルネン含量32モル%、結晶化度0%)を用いる以外は比較例1と同様にして、フィルム状試験片を作製した。試験片からの出射光は非晶性ポリマーであるため白色であった。
電子線照射の代わりに、ガンマ線照射装置(Nordion社「JS10000HD」、線源コバルト-60、大気下、常温(庫内温度40℃)を用いて線量350kGyで照射する以外は、実施例1と同様にして、フィルム状試験片を作製した。試験片からの出射光は非晶性ポリマーであるため白色であった。さらに、温度25℃での貯蔵弾性率は1500MPa、80℃での貯蔵弾性率3.06MPa、架橋点間分子量11000であった。
環状オレフィン系樹脂Aの代わりに、環状オレフィン系樹脂(Topas Advanced Polymers GmbH社製、商品名「TOPAS8007」、数平均分子量51000、ガラス転移温度80℃、ノルボルネン含量42モル%、結晶化度0%)を用いる以外は比較例1と同様にして、フィルム状試験片を作製した。試験片からの出射光は非晶性ポリマーであるため白色であった。
環状オレフィン系樹脂Aの代わりに、環状オレフィン系樹脂(Topas Advanced Polymers GmbH社製、商品名「TOPAS6013」、ガラス転移温度130℃、ノルボルネン含量50モル%、結晶化度0%)を用いて、加速電圧200kV、線量250kGyで電子線を照射する以外は比較例1と同様にして、フィルム状試験片を作製した。試験片からの出射光は非晶性ポリマーであるため白色であった。
Claims (14)
- 鎖状オレフィンと環状オレフィンとを重合成分とする鎖状オレフィン-環状オレフィン共重合体の架橋体であって、
前記環状オレフィンが二環式オレフィンを含み、
前記環状オレフィンの割合が、前記鎖状オレフィンと前記環状オレフィンとの合計に対して15モル%を超え、40モル%以下であり、かつ
前記鎖状オレフィン-環状オレフィン共重合体のガラス転移温度が20~80℃である架橋体。 - 鎖状オレフィンと環状オレフィンとを重合成分とする鎖状オレフィン-環状オレフィン共重合体の架橋体であって、
前記環状オレフィンが二環式オレフィンを含み、
前記環状オレフィンの割合が、前記鎖状オレフィンと前記環状オレフィンとの合計に対して15モル%を超え、40モル%以下であり、かつ
前記鎖状オレフィン-環状オレフィン共重合体の結晶化度が1%以下である架橋体。 - 鎖状オレフィン-環状オレフィン共重合体の結晶化度が0.5%以下である請求項1又は2記載の架橋体。
- JIS K7136に準拠したヘーズが2%以下である請求項1~3のいずれかに記載の架橋体。
- 鎖状オレフィン-環状オレフィン共重合体のガラス転移温度が30~50℃である請求項1~4のいずれかに記載の架橋体。
- 環状オレフィンがノルボルネン類であり、かつ鎖状オレフィンと環状オレフィンとのモル比が、鎖状オレフィン/環状オレフィン=84/16~75/25である請求項1~5のいずれかに記載の架橋体。
- JIS K7127に準拠した厚み100μmにおける破断伸度が100~400%であり、かつトルエンを用いて3時間還流させる方法で測定したゲル分率が70重量%以上である請求項1~6のいずれかに記載の架橋体。
- 温度25℃での貯蔵弾性率が100~4000MPa、温度80℃での貯蔵弾性率が0.01~10MPa、架橋点間分子量が8000~30000である請求項1~7のいずれかに記載の架橋体。
- 架橋性基を有する樹脂及び架橋剤を実質的に含有しない請求項1~8のいずれかに記載の架橋体。
- 電子線架橋体である請求項1~9のいずれかに記載の架橋体。
- シート状であり、かつ光学素子の封止材料である請求項1~10のいずれかに記載の架橋体。
- 鎖状オレフィン-環状オレフィン共重合体を電子線又は放射線で架橋して請求項1記載の架橋体を製造する方法。
- 加熱することなく、電子線で架橋する請求項12記載の方法。
- 加速電圧150kV以上及び照射線量200kGy以上の電子線で架橋する請求項12又は13記載の方法。
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JP2012549171A JP5155500B2 (ja) | 2011-04-21 | 2012-04-23 | 環状オレフィン系樹脂の架橋体及びその製造方法 |
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WO2013084836A1 (ja) * | 2011-12-06 | 2013-06-13 | 株式会社ダイセル | シート状カバリング剤、カバリング方法又は電子デバイスの製造方法 |
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US7364672B2 (en) * | 2004-12-06 | 2008-04-29 | Arlon, Inc. | Low loss prepregs, compositions useful for the preparation thereof and uses therefor |
JP6062407B2 (ja) * | 2013-11-14 | 2017-01-18 | 株式会社ダイセル | 離型フィルム、積層体及びその製造方法並びに燃料電池の製造方法 |
US10381177B2 (en) | 2016-03-14 | 2019-08-13 | Citizen Electronics Co., Ltd. | Push switch, method of manufacturing push switch, and electronic device including push switch |
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- 2012-04-23 US US14/113,185 patent/US20140044950A1/en not_active Abandoned
- 2012-04-23 KR KR1020137030455A patent/KR20130136589A/ko not_active Application Discontinuation
- 2012-04-23 WO PCT/JP2012/060849 patent/WO2012144644A1/ja active Application Filing
- 2012-04-23 JP JP2012549171A patent/JP5155500B2/ja not_active Expired - Fee Related
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US20140044950A1 (en) | 2014-02-13 |
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JPWO2012144644A1 (ja) | 2014-07-28 |
KR20130136589A (ko) | 2013-12-12 |
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