EP0164217A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Thermoplastic elastomer composition
Assignee: Mitsui Chemicals Inc
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Filing: 1985-05-01
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Granted: —
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Expires: 2005-05-01
Abstract
Abstract A thermoplastic elastomer composition composed of a partially crosslinked product of a blend consisting mainly of (a) 80 to 10 parts by weight of a peroxide-crosslinkable olefinic copolymer rubber, (b) 10 to 80 parts by weight of a peroxide-crosslinkable polyolefin resin having specific properties and (c) 50 to 10 parts by weight of a peroxide-decomposable polyolefin resin, the total amount of (a) + (b) + (c) being 100 parts by weight, the crosslinked product is obtained by dynamically heat-treating said blend in the presence of (d) an organic peroxide. The thermoplastic elastomer has excellent film formability, and is useful as a waterproof sheet.
Inventors
- 👤 Katsuyoshi Yonekura
- 👤 Akira Uchiyama
- 👤 Akira Matsuda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 15:48
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08K; C08K5/00; C08K5/04; C08K5/14; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L23/10; C08L23/12; C08L23/16; C08L91/00; C08L2203/00; C08L2203/16; C08L2205/00; C08L2205/03; C08L2312/00; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
146 words
A thermoplastic elastomer composed of a partially crosslinked product of a blend consisting mainly of (a) 80 to 10 parts by weight of a peroxide-crosslinkable olefinic copolymer rubber, (b) 10 to 80 parts by weight of a peroxide-crosslinkable polyolefin resin, and (c) 50 to 10 parts by weight of a peroxide-decomposable polyolefin resin, the total amount of (a) + (b) + (c) being 100 parts by weight, said crosslinked product being obtained by dynamically heat-treating said blend in the presence of (d) an organic peroxide, and said peroxide-crosslinkable polyolefin resin (b) being a random copolymer of ethylene and an alpha-olefin having 4 to 10 carbon atoms which has an ethylene content of from 90 to 99.5 mole %, a melt index of from 0.1 to 50 g/10 min., a density of from 0.910 to 0.940 g/cm 3 and a melting point of from 115 to 130°C.
Claim 2
Dependent Claim
146 words
A thermoplastic elastomer composed of a partially crosslinked product of a blend consisting mainly of (a) 80 to 10 parts by weight of a peroxide-crosslinkable olefinic copolymer rubber, (b) 10 to 80 parts by weight of a peroxide-crosslinkable polyolefin resin, and (c) 50 to 10 parts by weight of a peroxide-decomposable polyolefin resin, the total amount of (a) + (b) + (c) being 100 parts by weight, said crosslinked product being obtained by dynamically heat-treating said blend in the presence of (d) an organic peroxide, and said peroxide-crosslinkable polyolefin resin (b) being a random copolymer of ethylene and an alpha-olefin having 4 to 10 carbon atoms which has an ethylene content of from 90 to 99.5 mole %, a melt index of from 0.1 to 50 g/10 min., a density of from 0.910 to 0.940 g/cm 3 and a melting point of from 115 to 130°C.
Claim 3
Dependent Claim
19 words
An elastomer according to claim 1 wherein said blend further comprises a softening agent of the mineral oil type.
Claim 4
Dependent Claim
36 words
An elastomer accoding to claim 2 wherein said blend further contains not more than 50% by weight, based on the total weight of (a), (b) and (c), of a softening agent of the mineral oil type.
Claim 5
Dependent Claim
34 words
An elastomer according to any one of the preceding claims wherein said blend further comprises not more than 40% by weight, based on the total weight of (a), (b) and (c), of a filler.
Claim 6
Dependent Claim
40 words
5: An elastomer according to any one of the preceding claims wherein the organic peroxide (d) is used in an amount of from 0.05 to 3% by weight based on the total weight of the components (a), (b) and (c).
Claim 7
Dependent Claim
41 words
An elastomer according to any one of the preceding claims wherein the peroxide-crosslinkable olefinic copolymer rubber (a) is an ethylene/propylene copolymer rubber or ethylene/propylene/non-conjugated diene copolymer rubber in which the mole ratio of ethylene to propylene is from 50:50 to 85:15.
Claim 8
Dependent Claim
42 words
An elastomer according to any one of the preceding claims wherein the peroxide-decomposable polyolefin resin (c) is a homopolymer of an alpha-olefin having at least 3 carbon atoms or a copolymer of at least two alpha-olefins having at least 3 carbon atoms.
Claim 9
Dependent Claim
24 words
An elastomer according to claim 7 wherein the peroxide-decomposable polyolefin resin (c) is a homo-or copolymer of propylene, 1-butene, 4-methyl-l-pentene, 1-hexene, 1-octene or 1-decene.
Claim 10
Dependent Claim
13 words
An elastomer according to claim 8 wherein the peroxide-decomposable resin (c) is polypropylene.
Claim 11
Dependent Claim
24 words
An elastomer according to claim 8 wherein the peroxide-decomposable polyolefin resin (c) is a copolymer containing at least 50 mole % of propylene units.
Claim 12
Dependent Claim
27 words
-11. An elastomer according to any one of claims 7 to 10 wherein the peroxide-decomposable polyolefin resin (c) has a melt index of 0.1 to 50 g/min.
Claim 13
Dependent Claim
59 words
An elastomer according to any one of the preceding claims wherein said blend is composed of 50 to 20 parts by weight of component (a), 30 to 50 parts by weight of component (b) and 20 to 50 parts by weight of component (c) with the total amount of (a) + (b) + (c) being 100 parts by weight.
Claim 14
Dependent Claim
16 words
A waterproof sheet molded from a thermoplastic elastomer according to any one of the preceding claims.
References Cited (Backward Citations)
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