US4247652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic elastomer blends with olefin plastic, and foamed products of the blends
Assignee: Mitsui Chemicals Inc
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Filing: 1979-07-17
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Granted: 1981-01-27
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Expires: 1999-07-17
Abstract
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).
Inventors
- 👤 Akira Matsuda
- 👤 Shizuo Shimizu
- 👤 Shunji Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08K; C08K5/00; C08K5/04; C08K5/14; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/08; C08L23/0846; C08L23/0853; C08L23/10; C08L23/16; C08L23/18; C08L23/20; C08L23/22; C08L91/00; C08J2323/00; C08J2323/02; C08L2205/00; C08L2205/03; C08L2312/00; C08L2312/02; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
253 words
A method of producing a foamed product of a thermoplastic elastomer comprising: heating to melt a foamable composition comprising: (A) 100 to 5 parts by weight of a partially cured elastomer composition obtained by dynamic heat-treatment, in the presence of an organic peroxide, of a mixture of 100to 50 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 50 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 a peroxide-non-curable hydrocarbon rubbery material selected from the group consisting of polyisobutylene and butyl rubber, and (d) a mineral oil softener, and (B) 0 to 95 parts by weight of 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 there between; and copolymers thereof with 15 mole % or less of another copolymerizable monomer; 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 blend of the component (A) and the component (B); and (C) a decomposition type foaming agent, and molding the molten composition while foaming.
Claim 2
Independent Claim
253 words
A method of producing a foamed product of a thermoplastic elastomer comprising: heating to melt a foamable composition comprising: (A) 100 to 5 parts by weight of a partially cured elastomer composition obtained by dynamic heat-treatment, in the presence of an organic peroxide, of a mixture of 100to 50 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 50 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 a peroxide-non-curable hydrocarbon rubbery material selected from the group consisting of polyisobutylene and butyl rubber, and (d) a mineral oil softener, and (B) 0 to 95 parts by weight of 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 there between; and copolymers thereof with 15 mole % or less of another copolymerizable monomer; 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 blend of the component (A) and the component (B); and (C) a decomposition type foaming agent, and molding the molten composition while foaming.
Claim 3
Dependent Claim
116 words
A method of producing a foamed product of a thermoplastic composition according to claim 1 comprising: a partially cured elastomer composition (A) obtained by dynamic heat-treatment, in the presence of an organic peroxide, of a mixture of 90 to 50 parts by weight of said (a) peroxide-curable olefin copolymer rubber, 10to 50 parts by weight of said (b) peroxide-decomposing olefin plastic, wherein the sum of the component (a) and the component (b) is 100 parts by weight, and 5 to 50 parts by weight of at least one member of said (c) peroxide-non-curable hydrocarbon rubbery material, and (d) a mineral oil softener, and (B) a decomposition type foaming agent, and molding the molten composition while foaming.
Claim 4
Dependent Claim
143 words
A method of producing a foamed product of a thermoplastic composition according to claim 1 comprising: heating to melt a foamable composition composing: 5 to 95 parts by weight of a partially cured elastomer composition (A) obtained by dynamic heat-treatment of, in the presence of an organic peroxide, a mixture of 100 to 50 parts by weight of said (a) peroxide-curable olefin copolymer rubber, 0 to 50 parts by weight of said (b) peroxide-decomposing olefin plastic, wherein the sum of the component (a) and the component (b) is 100 parts by weight, and 5 to 100 parts by weight of at least one member of said (c) peroxide-non-curable hydrocarbon rubbery material, and (d) a mineral oil softener, and (B) 95 to 5 parts by weight of said olefin plastic, and (C) a decomposition type foaming agent, and molding the molten composition while foaming.
Claim 5
Dependent Claim
20 words
A method according to claim 1, 2 or 3, wherein the peroxide-curable olefin copolymer rubber (a) is ethylene-propylene copolymer rubber.
Claim 6
Dependent Claim
21 words
A method according to claim 1, 2 or 3, wherein the peroxide-curable olefin copolymer rubber (a) is ethylene-propylene-non-conjugated diene copolymer rubber.
Claim 7
Dependent Claim
17 words
A method according to claim 5, wherein the ethylene-propylene-non-conjugated diene copolymer rubber is ethylene-propylene-ethylidene norbornene copolymer rubber.
Claim 8
Dependent Claim
32 words
A method according to claim 1, 2 or 3, wherein the Mooney viscosity ML 1+4 (100° C.) of the peroxide-curable olefin copolymer rubber (a) is in the range of 40 to 80.
Claim 9
Dependent Claim
18 words
A method according to claim 1, 2 or 3, wherein the peroxide-decomposing olefin plastic (b) is isotactic polypropylene.
Claim 10
Dependent Claim
18 words
A method according to claim 1, 2 or 3, wherein the peroxide-decomposing olefin plastic (b) is propylene-alpha-olefin copolymer.
Claim 11
Dependent Claim
28 words
A method according to claim 1, 2 or 3, wherein the Melt Index (ASTM D-1238-65T, 230° C.) of the peroxide-decomposing olefin plastic (b) is from 5 to 20.
Claim 12
Dependent Claim
17 words
A method according to claim 1, 2 or 3, wherein the organic peroxide is 1,3-bis(tert.-butyl peroxyisopropyl) benzene.
Claim 13
Dependent Claim
32 words
A method according to claim 1, 2 or 3, wherein the organic peroxide is used in an amount of 0.05 to 1.0 % by weight based on the mixture to be heat-treated.
Claim 14
Dependent Claim
30 words
A method according to claim 1, 2 or 3, wherein the mixture is heat-treated not only in the presence of organic peroxide but also in the presence of divinyl benzene.
Claim 15
Dependent Claim
27 words
A method according to claim 13, wherein divinyl benzene is used in an amount of 0.3 to 1.0 % by weight of the mixture to be heat-treated.
Claim 16
Dependent Claim
18 words
A method according to claim 1, 2 or 3, wherein the peroxide-non-curable hydrocarbon rubbery material (c) is polyisobutylene.
Claim 17
Dependent Claim
19 words
A method according to claim 1, 2 or 3, wherein the peroxide-non-curable hydrocarbon rubber material (c) is butyl rubber.
Claim 18
Dependent Claim
43 words
A method according to claim 1, 2 or 3, wherein the peroxide-non-curable hydrocarbon rubbery material (c) is mixed in an amount of 5 to 15 parts by weight with 100 parts by weight in total of the component (a) and the component (b).
Claim 19
Dependent Claim
42 words
A method according to claim 1, 2 or 3, wherein the mineral oil softener (d) is mixed in an amount of 10 to 30 parts by weight with 100 parts by weight in total of the component (a) and the component (b).
Claim 20
Dependent Claim
18 words
A method according to claim 1, 2 or 3, wherein the decomposition type foaming agent (B) is azodicarbonamide.
Claim 21
Dependent Claim
38 words
A method according to claim 1, 2 or 3, wherein the decomposition type foaming agent (B) is used in an amount of 0.01 to 5 % by weight with 100 parts by weight of the elastomer composition (A).
Claim 22
Dependent Claim
25 words
A method according to claim 1, 2 or 3, wherein the expansion ratio of the foamed product of the thermoplastic elastomer is 1.05 to 1.3.
Claim 23
Dependent Claim
25 words
A method according to claim 1, 2 or 3, wherein the expansion ratio of the foamed product of the thermoplastic elastomer is 1.4 to 3.0.
Claim 24
Dependent Claim
21 words
A method according to claim 1, 2 or 3, wherein almost all the cells of the foamed products are isolated cells.
References Cited (Backward Citations)
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GB1010549A
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US3862106A
Cited
US3806558A
Cited
US3957919A
Cited
US4088714A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |