Thermoplastic elastomer composition, blends of the composition with olefin plastic, and foamed products of the composition and the blends
First Claim
1. A thermoplastic composition which comprises:
- 100 to 5 parts by weight of (A) a partially cured elastomer composition obtained by dynamic heat-treatment, in the presence of an organic peroxide, of a mixture of 100 to 40 parts by weight of (a) peroxide-curable olefin copolymer rubber selected from the group consisting of ethylene-propylene copolymer rubber and ethylene-propylene-non conjugated diene terpolymer rubber,0 to 60 parts by weight of (b) a peroxide-decomposing olefin plastic selected from the group consisting of isotactic polypropylene and propylene- alpha olefin copolymer.wherein the sum of the component (a) and the component (b) is 100 parts by weight, and5 to 100 parts by weight of (c) at least one member of peroxide-non curable hydrocarbon rubbery material selected from the group consisting of polyisobutylene and butyl rubber, and (d) mineral oil softener; and
0 to 95 parts by weight of (B) an olefin plastic selected from the group consisting of hompolymers of an alpha olefin selected from the group consisting of ethylene, propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 3-methyl-1-pentene, 4-methyl-1-pentene and 1-octene;
copolymers therebetween; and
copolymers thereof with 15 mole % or less of another copolymerizable monomer;
wherein the sum of the component (b) and the component B account for not less than 5 parts by weight among 100 parts by weight of the final composition.
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Accused Products
Abstract
Dynamically partially cured composition comprising a peroxide-curable olefin copolymer rubber (such as EDPM) and a peroxide-decomposing olefin plastic (such as PE and PP) is improved by effecting the dynamic heat-treatment with addition of a peroxide-non-curable hydrocarbon rubber (such as PIB) and/or a mineral oil softener (process oil). The dynamic heat-treatment is preferably carried out not only in the presence of an organic peroxide but also in the presence of divinyl benzene. The elastomeric composition is thermoplastic and, with or without further blending with an olefin plastic, is processable by techniques conventionally used for thermoplastic resins. This elastomer composition and blends of the elastomer composition and olefin plastic can be used for producing foamed product in combination with decomposition type foaming agent (such as azodicarbonamide).
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Citations
20 Claims
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1. A thermoplastic composition which comprises:
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100 to 5 parts by weight of (A) a partially cured elastomer composition obtained by dynamic heat-treatment, in the presence of an organic peroxide, of a mixture of 100 to 40 parts by weight of (a) peroxide-curable olefin copolymer rubber selected from the group consisting of ethylene-propylene copolymer rubber and ethylene-propylene-non conjugated diene terpolymer rubber, 0 to 60 parts by weight of (b) a peroxide-decomposing olefin plastic selected from the group consisting of isotactic polypropylene and propylene- alpha olefin copolymer. wherein the sum of the component (a) and the component (b) is 100 parts by weight, and 5 to 100 parts by weight of (c) at least one member of peroxide-non curable hydrocarbon rubbery material selected from the group consisting of polyisobutylene and butyl rubber, and (d) mineral oil softener; and 0 to 95 parts by weight of (B) an olefin plastic selected from the group consisting of hompolymers of an alpha olefin selected from the group consisting of ethylene, propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 3-methyl-1-pentene, 4-methyl-1-pentene and 1-octene;
copolymers therebetween; and
copolymers thereof with 15 mole % or less of another copolymerizable monomer;wherein the sum of the component (b) and the component B account for not less than 5 parts by weight among 100 parts by weight of the final composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of producing a thermoplastic composition, which comprises dynamically heat-treating, in the presence of an organic peroxide, a mixture of 100 to 40 parts by weight of (a) a peroxide-curable olefin copolymer rubber selected from the group consisting of ethylene-propylene copolymer rubber and ethylene-propylene-non conjugated diene terpolymer rubber,
0 to 60 parts by weight of (b) a peroxide-decomposing olefin plastic selected from the group consisting of isotactic polypropylene and propylene-alpha olefin copolymer, wherein the sum of component (a) and component (b) is 100 parts by weight, 5 to 100 parts by weight of at least one member of (c) peroxide-non-curable hydrocarbon rubbery material selected from polyisobutylene and butyl rubber, and (d) mineral oil softeners; - to obtain a thermoplastic elastomer composition (A); and
then, homogeneously blending 100 to 5 parts by weight of said composition (A) and 0 to 95 parts by weight of (B) an olefin plastic selected from the group consisting of homopolymers of an alpha olefin selected from the group consisting of ethylene, propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 3-methyl-1-pentene, 4-methyl-1-pentene and 1-octene;
copolymers therebetween; and
copolymers thereof with 15 mole % or less of another copolymerizable monomer;wherein the sum of said component (b) and said component (B) account for not less than 5 parts by weight among 100 parts of the final product. - View Dependent Claims (12, 13, 14, 15, 16, 19, 20)
- to obtain a thermoplastic elastomer composition (A); and
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17. A method of producing a thermoplastic elastomer composition, which comprises dynamically heat-treating, in the presence of an organic peroxide and divinyl benzene, a mixture of 90 to 40 parts by weight of (a) a peroxide-curable olefin copolymer rubber selected from the group consisting of ethylene-propylene copolymer rubber and ethylene-propylene-non conjugated diene copolymer rubber andto 60 parts by weight of (b) a peroxide-decomposing olefin plastic selected from the group consisting of isotactic polypropylene and propylene-alpha olefin copolymer,
wherein the sum of these components is 100 parts by weight.
Specification