Claims
- 1. A thermoplastic elastomer composition which comprises a mixture comprising (A) 20-50 parts by weight of an olefinic copolymer rubber, (B) 50-80 parts by weight of a thermally pre-decomposed olefinic plastic having a ratio of melt index M.sub.1 /M.sub.0 of 2-50 wherein M.sub.1 /M.sub.0 is a thermal decomposition degree of olefinic plastic thermally pre-decomposed, M.sub.0 is a melt index of the plastic before being subjected to thermal decomposition with organic peroxide and M.sub.1 is a melt index of the plastic after being subjected to the thermal decomposition with the organic peroxide, sum of (A) and (B) being 100 parts by weight, (C) 5-25 parts by weight of a mineral oil, (D) 0.1-3 parts by weight of a bismaleimide compound, and (E) an organic peroxide.
- 2. A composition according to claim 1 wherein the olefinic copolymer rubber (A) has a Mooney viscosity (ML.sub.1+4 100.degree. C.) of 30-140.
- 3. A composition according to claim 1 wherein the olefinic copolymer rubber (A) is an ethylene-propylene-non-conjugated diene copolymer having a Mooney viscosity (ML.sub.1+4 100.degree. C.) of 30-140 and containing 10-30% by weight of propylene.
- 4. A composition according to claim 1 wherein the thermally pre-decomposed olefinic plastic (B) is an isotactic polypropylene or a propylene-a-olefin copolymer having a melt index M.sub.0 of 1-10 g/10 min before subjected to the thermal decomposition and a melt index M.sub.1 of 20-50 g/10 min after subjected to the thermal pre-decomposition.
- 5. A composition according to claim 1 wherein the bismaleimide compound (D) is N,N'-m-phenylene-bismaleimide.
- 6. A bumper part comprised of the composition according to claim 1.
- 7. An automobile exterior trim part comprised of the composition according to claim 1.
- 8. An electrical part comprised of the composition according to claim 1.
- 9. A process for producing a thermoplastic elastomer composition which comprises preparing a mixture of (A) 20-50 parts by weight of an olefinic copolymer rubber, (B) 50-80 parts by weight of a thermally pre-decomposed olefinic plastic having a ratio of melt index M.sub.1 /M.sub.0 of 2-50 wherein M.sub.1 /M.sub.0 is a thermal decomposition degree of olefinic plastic thermally pre-decomposed, M.sub.0 is a melt index of the plastic before being subjected to thermal decomposition with organic peroxide and M.sub.1 is a melt index of the plastic after being subjected to the thermal decomposition with the organic peroxide, the sum of (A) and (B) being 100 parts by weight, (C) 5-25 parts by weight of a mineral oil and (D) 0.1-3 parts by weight of a bismaleimide compound, said bismaleimide compound (D) being homogeneously dispersed in said mixture, and then dynamically heat treating said mixture in the presence of (E) an organic peroxide.
- 10. A process according to claim 9 wherein the olefinic copolymer rubber (A) has a Mooney viscosity (ML.sub.1+4 100.degree. C.) of 30-140.
- 11. A process according to claim 9 wherein the olefinic copolymer rubber (A) is an ethylene-propylene-non-conjugated diene copolymer rubber having a Mooney viscosity (ML.sub.1+4 100.degree. C.) of 30-140 and containing 10-30% by weight of propylene.
- 12. A process according to claim 9 wherein the olefinic plastic (B) is an isotactic polypropylene or propylene-.alpha.-olefin copolymer having a melt index M.sub.0 of 1-10 g/10 min before subjected to the thermal decomposition and a melt index M.sub.1 of 20-50 g/10 min after subjected to the thermal pre-decomposition.
- 13. A process according to claim 9 wherein the bismaleimide compound (D) is N,N'-m-phenylenebismaleimide.
- 14. A process according to claim 9 wherein the dispersion is made in the nitrogen atmosphere.
Priority Claims (1)
Number |
Date |
Country |
Kind |
61-257635 |
Oct 1986 |
JPX |
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RELATED APPLICATIONS
This application is a continuation of U.S. application Ser. No. 07/111,878 filed Oct. 23, 1987, now abaonded.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3641215 |
Osamoto et al. |
Feb 1972 |
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4247652 |
Matsuda |
Jan 1981 |
|
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Date |
Country |
0142930 |
May 1985 |
EPX |
1907926 |
Aug 1970 |
DEX |
034837 |
Mar 1983 |
JPX |
Non-Patent Literature Citations (2)
Entry |
European Search Report for EP 87 30 9515. |
Chemical Abstracts, vol. 99, No. 14, Oct. 3, 1983, p. 65, Abstract No. 106639z. |
Continuations (1)
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Number |
Date |
Country |
Parent |
111878 |
Oct 1987 |
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