JPH1087913A - Ethylene-alpha-olefin-nonconjugated diene copolymer composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition enabling to produce a preferable rubbery elastic crosslinked product in a short time by using the irradiation with light blending an ethylene-α-olefin-nonconjugated diene copolymer with a multifunctional unsaturated monomer, a photocrosslinking initiator, etc. SOLUTION: This composition obtained by containing preferably (A) 100 pts.wt. of an ethylene-α-olefin-nonconjugated diene copolyer, (B) 0.05-20 pts.wt. of a multifunctional unsaturated monomer, (C) 0.01-10 pts.wt. of a photocrosslinding initiator, (D) 10-100 pts.wt. of amorphous silica, (E) 0.1-10 pts.wt. of a silane coupling agent, and further preferably (F) 0.1-5 pts.wt. of an aliphatic amine. The component A is preferably the copolymer having an ethylene/α-olefin weight ratio of 20/80 to 95/5. The composition can thereby be crosslinked in a short time with a small amount of energy by the use of a small crosslinking facility.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ethylene-.alpha.-olefin-non-conjugated diene copolymer composition, and more particularly to an ethylene-.alpha.
An olefin-non-conjugated diene copolymer composition.

[0002]

2. Description of the Related Art Ethylene-α-olefin copolymer rubber is excellent in various moldability, mechanical properties, water resistance, weather resistance and chemical resistance, and is a functional part for transportation equipment such as automobiles and ships.
It is manufactured and used in a wide range of industrial fields such as home appliances, office equipment, furniture, daily necessities, sundries, and architecture. These products are manufactured by heat crosslinking using thermal energy. Here, as the heat crosslinking, continuous molding of uncrosslinked moldings by hot press, injection molding machine, mold molding and crosslinking using a transfer molding machine, hot air crosslinking machine (HAV), and high frequency crosslinking machine (UHF) is used. Direct steam crosslinking with a sulfur can is known. However,
When the ethylene-α-olefin-nonconjugated diene copolymer composition is crosslinked by heating, there are the following problems. (1) In order for the ethylene-α-olefin-non-conjugated diene copolymer composition to exhibit rubber-like elasticity, it is necessary to provide a long-term heat history at a high temperature, and a large-scale crosslinking facility and a large amount of Energy is required. (2) When a thick molded product is crosslinked, the molded product is likely to be deformed.

[0003]

SUMMARY OF THE INVENTION The present invention has been made against the background of the above-mentioned conventional technical problems. A first object of the present invention is to provide a photocrosslinkable ethylene-α-olefin-nonconjugated diene copolymer composition which can be crosslinked by a small-scale crosslinking facility. A second object of the present invention is to provide a photo-crosslinkable ethylene-α-olefin-non-conjugated diene copolymer composition which can be cross-linked in a shorter time than in the case of heat cross-linking. A third object of the present invention is to provide a photocrosslinkable ethylene-α-olefin-non-conjugated diene copolymer composition that can be crosslinked with a smaller amount of energy as compared with the case of heat crosslinking. . A fourth object of the present invention is to provide a photocrosslinkable ethylene-α-olefin-nonconjugated diene copolymer composition which does not cause problems such as deformation in the obtained crosslinked product.

[0004]

DISCLOSURE OF THE INVENTION The ethylene-.alpha.
The olefin-non-conjugated diene copolymer composition is an ethylene-α-olefin-non-conjugated diene copolymer (A) 100
Polyfunctional unsaturated monomer (B) 0.05 to parts by weight
20 parts by weight, 0.01 to 10 parts by weight of a photocrosslinking initiator (C), 10 to 100 parts by weight of amorphous silica (D), and 0.1 to 10 parts by weight of a silane coupling agent (E). It is characterized by becoming. In addition, aliphatic amine (F) 0.1
It is preferred that the composition contains up to 5 parts by weight.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The ethylene-α-olefin-non-conjugated diene copolymer composition of the present invention will be described in detail below. The composition of the present invention is a photocrosslinkable composition in which a crosslinking reaction of an ethylene-α-olefin-non-conjugated diene copolymer proceeds by light. Irradiates the crosslinked product having a preferable rubbery elasticity for a short time (for example, several seconds to several tens of seconds).
Can be manufactured.

<Ethylene-α-olefin-non-conjugated diene copolymer (A)> The ethylene-α-olefin-non-conjugated diene copolymer in the present invention is a copolymer of ethylene, α-olefin and non-conjugated diene. .

Examples of the α-olefin include propylene, butene-1, pentene-1,2-methylbutene-1,3-methylbutene-1, hexene-1,3-methylpentene-1,4-methylpentene-1,3,3-dimethylbutene. 1, heptene-1, methylhexene-1,
Dimethylpentene-1, trimerylbutene-1, ethylpentene-1, octene-1, methylpentene-1, dimethylhexene-1, trimethylpentene-1, ethylhexene-1, methylethylpentene-1, diethylbutene-1, propylpentene-1 , Decene-1, methylnonene-1, dimethyloctene, trimethylpeptene-1, ethyloctene-1, methylethylheptene-1,
Examples include diethylhexene-1, dodecene-1, and hexadcene. Among these α-olefins, propylene, butene-1, pentene-1, hexene-1, heptene-1, and octene-1 are preferred, and propylene, pentene-1, hexene-1, and octene-1 are particularly preferred.

The non-conjugated diene includes dicyclopentadiene, 5-ethylidene-2-norbornene, tricyclopentadiene, 5-methyl-2,5-norbornadiene,
5-methylene-2-norbornene, 5-isopropenyl-2-norbornene, 5- (1-butenyl) -2-norbornene, cyclooctadiene, vinylcyclohexene, 1,5,9-cyclododecatriene, 6-methyl-4,7,8,9- Tetrahydroindene, 2,2'-dicyclopentenyl, trans-1,2-divinylcyclobutane, 2-methyl-1,4-hexadiene, 1,6-octadiene, 1,7-octadiene, 1,4-hexadiene, 1,8-nonadiene, 1,9 -Decadien,
3,6-dimethyl-1,7-octadiene, 4,5-dimethyl-1,7-octadiene, 1,4,7-octatriene, 5-methyl-1,8-nonadiene, dicyclooctadiene, methylene norbornene, and the like. They can be used alone or in combination of two or more. Among these non-conjugated dienes,
Preferred are 5-ethylidene-2-norbornene, dicyclopentadiene and 1,9-decadiene, and particularly preferred are 5-ethylidene-2-norbornene and dicyclopentadiene.

The weight ratio of ethylene / α-olefin in the ethylene-α-olefin-non-conjugated diene copolymer (A) is preferably from 20/80 to 95/5,
More preferably, it is 30/70 to 90/10. Here, if the weight ratio of ethylene / α-olefin is less than 20/80, the physical properties of the crosslinked product may decrease,
If it exceeds 5, the cold resistance of the crosslinked product may decrease. Ethylene-α-olefin-non-conjugated diene copolymer (A)
Has a iodine value of preferably 1 to 60, and more preferably 3 to 50 as an iodine value. Here, when the iodine value is less than 1, the crosslinked product does not show sufficient rubber elasticity, and when the iodine value exceeds 60, gelation occurs during kneading. Mooney viscosity of the ethylene-α-olefin-non-conjugated diene copolymer (A) [ML1 + 4 (100
℃); JIS K6300] is usually from 10 to 400, preferably from 15 to 200, more preferably from 20 to 400.
150.

The method for synthesizing the ethylene-α-olefin-non-conjugated diene copolymer (A) of the present invention (reaction catalyst, polymerization method, reaction conditions) is not particularly limited, and a conventionally known method is employed. can do. Also, ethylene-
The crystallinity and molecular weight distribution of the α-olefin-non-conjugated diene copolymer (A) are not particularly limited. In the present invention, the ethylene-α-olefin-non-conjugated diene copolymer (A) used may be one in which a part of a double bond is epoxy-modified, hydroxyl-modified, sulfonic-acid-modified, unsaturated carboxylic acid, It may be modified by adding an acid anhydride or the like.

<Polyfunctional unsaturated monomer (B)> The polyfunctional unsaturated monomer (B) constituting the composition of the present invention is an ethylene-α-olefin-non-conjugated diene copolymer ( It is contained as a crosslinking agent of A). Polyfunctional unsaturated monomer (B)
As, for example, ethylene glycol diacrylate,
Ethylene glycol dimethacrylate, propylene glycol diacrylate, propylene glycol dimethacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, neopentyl glycol diacrylate And alkylene glycol di (meth) acrylates such as neopentyl glycol dimethacrylate; polyalkylene glycol di (meth) acrylates such as polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, polypropylene glycol diacrylate, and polypropylene glycol dimethacrylate; trimethylolpropanetri Methacrylate,
Triesters such as trimethylolpropane triacrylate, tetramethylol methane trimethacrylate, and tetramethylol methane triacrylate; triallyl isocyanurate, tetramethylol methane tetraacrylate, and tetramethylol methane tetramethacrylate can be exemplified. Among these polyfunctional unsaturated monomers, more preferred are ethylene glycol dimethacrylate, polyethylene glycol # 400 dimethacrylate, and trimethylolpropane triacrylate. These can be used alone or in combination of two or more. The number of repeating alkylene oxides (-RO-) in the polyalkylene glycol di (meth) acrylate is preferably 10 or less from the viewpoint of performing sufficient photocrosslinking.

The content of the polyfunctional unsaturated monomer (B) in the composition of the present invention is 0.05 to 100 parts by weight of the ethylene-α-olefin-nonconjugated diene copolymer (A). 20 parts by weight, preferably 0.1 to 10
Parts by weight, more preferably 1 to 5 parts by weight. If the content is less than 0.05 parts by weight, the resulting ethylene-α
-The olefin-non-conjugated diene copolymer composition cannot be sufficiently crosslinked, and a suitable crosslinked product cannot be obtained. On the other hand, if the content exceeds 20 parts by weight, the resulting ethylene-α-olefin-non-conjugated diene copolymer composition will not have a suitable elastic state in crosslinking.

<Photocrosslinking Initiator (C)> The photocrosslinking initiator (C) is an essential component contained in order to carry out a radiation crosslinking reaction. Is a compound that imparts Examples of the photocrosslinking initiator (C) include acetophenone, 2,2-diethoxyacetophenone, p-dimethylaminoacetophenone, p-dimethylaminopropylacetophenone,
Acetophenones such as -tert-butyltrichloroacetophenone; benzophenone, 2-chlorobenzophenone, p, p'-dichlorobenzophenone, p, p '
Benzophenones such as -bisdiethylaminobenzophenone and p, p'-bisdimethylaminobenzophenone; benzoin ethers such as benzyl, benzoin, benzoin n-propyl ether, benzoin isopropyl ether, benzoin isobutyl ether and benzoin n-butyl ether; benzyl dimethyl ketal And benzyl ketals such as benzyl methyl ketal; and α-acyloxy esters such as benzoyl benzoate and benzyl (o-ethoxycarbonyl) α-monooxime. These may be used alone or in combination of two or more. May be used.

The content of the photocrosslinking initiator (C) in the composition of the present invention is 0.01 to 10 parts by weight based on 100 parts by weight of the ethylene-α-olefin-nonconjugated diene copolymer (A). And preferably 0.05 to 5
Parts by weight, more preferably 0.1 to 2 parts by weight.
If the content is less than 0.01 part by weight, the obtained ethylene-α-olefin-nonconjugated diene copolymer composition cannot be sufficiently crosslinked. On the other hand, when the content exceeds 10 parts by weight, crosslinking is excessively performed, and the tensile strength and elongation of the obtained crosslinked product of the ethylene-α-olefin-nonconjugated diene copolymer composition are reduced.

<Amorphous Silica (D)> Amorphous silica (D) exhibits suitable kneading processability in the obtained ethylene-α-olefin-nonconjugated diene copolymer composition, -Alpha-olefin-non-conjugated diene is an essential component contained in order to impart a suitable mechanical strength to the crosslinked product of the copolymer composition. Examples of the amorphous silica include dry silica and wet silica, and include precipitated silica, airgel silica, fumed silica, and surface-treated silica obtained by treating the surface with an organic silyl group or the like. Can be.

Of these, the crosslinked product of the obtained ethylene-α-olefin-non-conjugated diene copolymer composition can exhibit favorable tensile properties (modulus, tensile strength, elongation) and hardness, so Preferably, silica is used. Here, the fumed silica refers to silica composed of primary particles of 500 A ° or less and having a specific surface area of 100 m2 / g to 400 m2 / g. In addition, with respect to the obtained ethylene-α-olefin-non-conjugated diene copolymer composition, the refractive index of the amorphous silica (D) is 1.43 to 1.47 from the viewpoint of securing transparency and photocrosslinking property. It is preferred that

The content of the amorphous silica (D) in the composition of the present invention is 1 to 100 parts by weight of the ethylene-α-olefin-nonconjugated diene copolymer (A).
0 to 100 parts by weight, preferably 10 to 80 parts by weight. When the content is less than 10 parts by weight, the obtained ethylene-α-olefin-non-conjugated diene copolymer composition has poor kneading processability, and the ethylene-α-olefin-non-conjugated diene copolymer is obtained. The crosslinked product of the composition has poor tensile properties and does not have suitable mechanical strength. On the other hand, when the content exceeds 100 parts by weight, the hardness of the crosslinked product becomes excessively high, and the crosslinked product does not have a suitable elastic state.

<Silane Coupling Agent (E)> Examples of the silane coupling agent (E) in the present invention include:
Vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (β-methoxyethoxy) silane, N
-(Β-aminoethyl) γ-aminopropylmethyldimethoxysilane, N- (β-aminoethyl) γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ -Glycidoxypropylmethyldimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, vinyltrichlorosilane, γ-methacryloxypropyl Tris (β-methoxyethoxy) silane, vinyltriacetoxysilane, methyltrimethoxysilane,
Methyltriethoxysilane, hexamethyldisilazane,
γ-anilinopropyltrimethoxysilane, N-β-
(N-vinylbenzylaminoethyl) -γ-aminopropyltrimethoxysilane / hydrochloride. Among them, γ-methacryloxypropyltrimethoxysilane is preferred.

The content of the silane coupling agent (E) used in the composition of the present invention is 0.1 to 10 parts by weight based on 100 parts by weight of the ethylene-α-olefin-nonconjugated diene copolymer (A). And preferably 0.1 to 8
Parts by weight. If the content is less than 0.1 part by weight, the resulting crosslinked product of the ethylene-α-olefin-nonconjugated diene copolymer composition will have poor tensile properties and will not have suitable mechanical strength. On the other hand, if the content exceeds 10 parts by weight, the physical properties in a normal state are deteriorated, and the rubber does not have a suitable rubber elastic state.

<Aliphatic amine (F)> The aliphatic amine (F) is a component contained for further improving the kneading processability of the obtained ethylene-α-olefin-nonconjugated diene copolymer composition. It is. Examples of the aliphatic amine (F) include tridecylamine, tetradecylamine, pentadecylamine, hexadecylamine, heptadecylamine, and octadecylamine. Among them, those which are solid at normal temperature (20 to 25 ° C.) are preferable because of their excellent incorporation into rubber, and octadecylamine is particularly preferable.

The content of the aliphatic amine (F) in the composition of the present invention is 0.1 to 5 parts by weight based on 100 parts by weight of the ethylene-α-olefin-nonconjugated diene copolymer (A). Is done. If the content is less than 0.1 part by weight, the effect of improving the kneading processability cannot be sufficiently exhibited. On the other hand, if the content exceeds 5 parts by weight, the photocrosslinking property may be impaired.

Ultraviolet light and visible light are effective as light for crosslinking the composition of the present invention.
Ultraviolet light of 0-500 nm is preferred. Examples of a light source that can emit such light include a low-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a metal halide lamp, and an argon gas laser.

Further, if necessary, a polymerizable diluent such as a (meth) acryloyl group-containing monofunctional compound or a vinyl compound can be added to the composition of the present invention. Examples of the monofunctional compound include t-butyl (meth) acrylate, stearyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, butoxyethyl (meth) acrylate, ethoxydiethylene glycol (meth) acrylate, Cyclohexyl (meth) acrylate, dicyclopentadienyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, tricyclodecanyl (meth) acrylate isobornyl (meth) acrylate, bornyl (Meth) acrylate, acryloylmorpholine, diacetone (meth) acrylamide, isobutoxymethyl (meth) acrylamide, N, N'-dimethyl (meth) acrylamide, t
-Octyl (meth) acrylamide, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, 7-amino-3,7-dioctyl (meth) acrylate and the like. Examples of the vinyl compound include N-vinyl caprolactam, hydroxybutyl vinyl ether, N-vinyl pyrrolidone, lauryl vinyl ether, and triethylene glycol divinyl ether. These polymerizable diluents can be used alone or in combination of two or more. The amount of these polymerizable diluents added is 0
The amount is preferably from 20 to 20 parts by weight, particularly preferably from 0 to 10 parts by weight. If it exceeds 20 parts by weight, the cure shrinkage of the crosslinked product increases.

Further, a photosensitizer can be added to the rubber composition of the present invention. For example, triethylamine,
Examples include diethylamine, N-methyldiethanolamine, ethanolamine, 4-dimethylaminobenzoic acid, methyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate, and isoamyl 4-dimethylaminobenzoate. The addition amount of these photosensitizers is 0.01 to 10 parts by weight, particularly preferably 0.01 to 5 parts by weight. 10
If the amount is more than 10 parts by weight, the mechanical properties and handling of the crosslinked product may be adversely affected. If the amount is less than 0.01 part by weight, the curing speed is reduced.

The composition of the present invention may contain other rubbers in an amount not to impair photocrosslinking property, mechanical strength and transparency.
Fillers or reinforcing agents, crosslinking agents for functional groups, antioxidants, stabilizers, vulcanization retarders, plasticizers, antistatic agents, conductive plasticizers, antibacterial agents, functional group-containing oligomers, crosslinking aids, lubricants, A light stabilizer, a water removing agent, an antioxidant, a colorant, an ultraviolet absorber, a light stabilizer, a thermal polymerization inhibitor, a leveling agent, a surfactant, a storage stabilizer, and the like can be appropriately compounded.

Other rubbers include natural rubber, isoprene rubber, butadiene rubber, styrene butadiene rubber, chloroprene rubber, acrylonitrile butadiene rubber, butyl rubber, halogenated butyl rubber, ethylene propylene rubber, ethylene vinyl acetate rubber, acrylic rubber, ethylene rubber Acrylic rubber, chlorosulfonated polyethylene,
Examples include polymers and oligomers such as polysulfide rubber, epichlorohydrin rubber, epichloroethylene oxide rubber, urethane rubber, silicone rubber, fluorine rubber, hydrogenated styrene butadiene rubber, and hydrogenated nitrile rubber.

The filler or reinforcing agent includes SAF carbon black, ISAF carbon black, HAF carbon black, FEF carbon black, GPF carbon black, SRF carbon black, FT carbon black, MT carbon black, acetylene black,
Ketjen black, heavy calcium carbonate, chalk, light calcium carbonate, ultra-fine activated calcium carbonate, special calcium carbonate, basic magnesium carbonate, kaolin clay, calcined clay, pyrolite clay, silanized clay, natural silicic acid, Synthetic silicic anhydride, synthetic hydrous silicic acid, synthetic calcium silicate, synthetic magnesium silicate,
Synthetic aluminum silicate, magnesium carbonate, aluminum hydroxide, magnesium hydroxide, magnesium oxide,
Kaolin, sericite, talc, fine talc, wollastonite, zeolite, zonotonite, mica, asbestos, PMF (Processed Mineral)
Fiber), sepiolite, potassium titanate, elestadite, gypsum fiber, glass balun, silica balun,
Organic baluns such as hydrotalcite, fly ash balun, silas balun, carbon balun, phenolic resin, urea resin, styrene resin, saran resin, alumina, barium sulfate, aluminum sulfate, calcium sulfate, molybdenum disulfide, graphite, glass Fiber (chopped strand, roping, milled glass fiber,
Fillers such as glass flakes), cut fibers, rock fibers, microfibers, carbonated fibers, aromatic polyamide fibers, potassium titanate fibers, recycled rubber, rubber powder, ebonite powder, shellac, wood powder, and various reinforcing agents. .

Commercially available antioxidants include Irgan
ox 1010, 1035, 1076, 1222 (all manufactured by Ciba-Geigy Corporation) and the like. Commercially available ultraviolet absorbers include Tinuvin P, 234,
320, 326, 327, 328, 213 (all manufactured by Ciba-Geigy Corporation), Sumisorb 110, 13
0,140,220,250,300,320,34
0, 350, and 400 (all manufactured by Sumitomo Chemical Co., Ltd.), and as a commercially available light stabilizer, Tinuv
in 292, 144, 622LD (all manufactured by Ciba-Geigy Corporation), Sanol LS-770, 765, 29
2,2626,1114,744 (all manufactured by Sankyo Chemical Industry Co., Ltd.). Examples of the thermal polymerization inhibitor include hydroquinone, 2,6-t-butyl-4-methylphenol, hydroquinone methyl ether, and phenothiazine. , N-nitrosophenylhydroxylamine ammonium salt and the like. Commercially available antioxidants include:
Antigene W, S, P, 3C, 6C, RD-
G, FR, and AW (all manufactured by Sumitomo Chemical Co., Ltd.).

The composition of the present invention can be used for various sheet materials, tubes, gaskets, packings, O-rings, metal gaskets, rubber sheets, underlay rubbers such as computer speakers, anti-slip materials, and surfaces on desks. Processing, wire coating,
It can be suitably used for applications such as sealing materials, surface coating materials such as glassware, light bulbs and fluorescent lamps, and cover materials for soundproof walls. It can also be applied to on-site construction.

[0030]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples. <Examples 1 to 3> An ethylene-α-olefin-non-conjugated diene copolymer (A) was prepared according to the formulation shown in Table 1.
Polyfunctional unsaturated monomer (B) and photo-crosslinking initiator (C)
And a mixture of amorphous silica (D), a silane coupling agent (E), and an aliphatic amine (F) by kneading using a Banbury mixer, and then rolling and forming by an open roll. And a sheet-shaped composition having a thickness of 2 mm (compositions [1] to [3] of the present invention). <Comparative Example 1> In accordance with the formulation shown in Table 1, ethylene-
α-olefin-non-conjugated diene copolymer (A), polyfunctional unsaturated monomer (B), photocrosslinking initiator (C), silane coupling agent (E), and aliphatic amine ( The composition comprising F) was kneaded using a Banbury mixer, and then roll-formed using an open roll to obtain a sheet-shaped composition having a thickness of 2 mm (composition [4] for comparison). <Comparative Example 2> According to the formulation shown in Table 1, ethylene-
α-olefin-nonconjugated diene copolymer (A), polyfunctional unsaturated monomer (B), photocrosslinking initiator (C), amorphous silica (D), and silane coupling agent (E) and
The compound comprising the aliphatic amine (F) is kneaded using a Banbury mixer, and then roll-formed using an open roll to form a sheet-shaped composition having a thickness of 2 mm (composition [5] for comparison). I got

[0031]

[Table 1]

Ethylene-α-olefin-non-conjugated diene copolymer A1: EP51 (manufactured by Nippon Synthetic Rubber Co., Ltd.) A2: EP21 (manufactured by Nippon Synthetic Rubber Co., Ltd.) Multifunctional unsaturated monomer B1 : Trimethylolpropane triacrylate "TM
PA "(manufactured by Kyoeisha Yushi Kagaku Kogyo KK)-Photocrosslinking initiator C1: benzyl dimethyl ketal" Irgacure 65 "
1 "(manufactured by Nippon Ciba Geigy Co., Ltd.) C2: Benzoin isopropyl ether" PS-10 "
A "(manufactured by Wako Pure Chemical Industries, Ltd.)-Amorphous silica D1: fumed silica" Aerosil 972 "(manufactured by Nippon Aerosil Co., Ltd.) D2: fumed silica" Cabosil "(manufactured by Cabot Corporation) Silane coupling agent E1: γ-methacryloxypropyltrimethoxysilane “A-174” (manufactured by Nippon Unicar Co., Ltd.) Aliphatic amine F1: stearylamine (manufactured by Wako Pure Chemical Industries, Ltd.) F2: cetylamine (Wako Pure) Yakuhin Co., Ltd.)

<Crosslinking of Compositions> The compositions [1] to [3] of the present invention obtained in Examples 1 to 3 and the compositions [4] to [5] obtained in Comparative Examples 1 and 2 were used. A crosslinked product sheet was produced by irradiating each with ultraviolet rays according to the following conditions for crosslinking. In the composition [5] obtained in Comparative Example 2, the cross-linking reaction did not proceed, and a cross-linked sheet could not be obtained. [Cross-linking conditions] UV irradiation device: "UV curing unit"
[Oak Mfg. Co., Ltd.] Light source: metal halide lamp (3 kw) Sheet width of composition: 2 mm Belt speed (conveyance speed of composition): 5 m / min Light irradiation amount: 0.5 J / cm Number of irradiation times: 5 <Composition Evaluation of product> In Examples 1 to 3 and Comparative Examples 1 and 2, the kneading processability of the compound was evaluated. Further, for each of the crosslinked product sheets obtained from the composition of the present invention and the composition for comparison, a tensile test and a hardness test were performed in accordance with JIS K6301 (test method for vulcanized rubber) to determine physical properties. evaluated. Further, the light transmittance was evaluated by measuring the total light transmittance and the haze using a “Phase Meter” (manufactured by Suga Test Instruments Co., Ltd.). Table 1 shows the results.

[0034]

According to the first aspect of the present invention, an ethylene-α-olefin-non-conjugated diene copolymer composition capable of photocrosslinking can be provided, and the ethylene-α-olefin-non-conjugated diene can be provided. By irradiating the copolymer composition with light, a crosslinked product having a suitable rubbery elastic body can be efficiently produced in a short time (for example, several seconds to several tens of seconds). The photocrosslinking of the composition of the present invention can be performed by a small-scale facility such as an ultraviolet irradiation device. Furthermore, the crosslinked product obtained by photocrosslinking the composition of the present invention does not cause problems such as deformation which becomes a problem in the case of heat crosslinking. Then, the composition of the present invention is preliminarily molded by an extruder, and then subjected to ultraviolet irradiation by an ultraviolet irradiation device, whereby continuous molding of a long molded product becomes possible. And amorphous silica (D)
Is fumed silica, the resulting ethylene-α
In the crosslinked product of the olefin-non-conjugated diene copolymer composition, more preferable mechanical properties (tensile properties and hardness) can be exhibited. According to the invention of claim 2, the kneading processability of the obtained ethylene-α-olefin-nonconjugated diene copolymer composition can be further improved.

Claims (2)

[Claims] 1. A polyfunctional unsaturated monomer (B) in an amount of 0.05 to 20 parts by weight based on 100 parts by weight of an ethylene-α-olefin-non-conjugated diene copolymer (A). ) 0.01 to 10 parts by weight Amorphous silica (D) 10 to 100 parts by weight Ethylene-α-olefin-non-conjugated diene copolymer containing 0.1 to 10 parts by weight of silane coupling agent (E) Coalescing composition. 2. The ethylene-α- according to claim 1, comprising 0.1 to 5 parts by weight of an aliphatic amine (F).
An olefin-non-conjugated diene copolymer composition.