US4988764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact-resistant polypropylene resin compositions
Assignee: Toyota Motor Corp
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Filing: 1990-03-27
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Granted: 1991-01-29
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Expires: 2010-03-27
Abstract
Abstract The polypropylene resin composition of the present invention can be obtained by melt mixing: (a) a modified polypropylene obtained by grafting a crystalline propylene-ethylene block copolymer with an unsaturated carboxylic acid, or a crystalline polypropylene containing the modified polypropylene, (b) a polyamide, and (c) a modified ethylene- alpha -olefin copolymer rubber obtained by grafting an ethylene- alpha olefin copolymer rubber with an unsaturated carboxylic acid. This composition is superior in low temperature impact resistance, rigidity, heat resistance and oil resistance.
Inventors
- 👤 Takeyoshi Nishio
- 👤 Toshio Yokoi
- 👤 Takao Nomura
- 👤 Kouhei Ueno
- 👤 Tomohiko Akagawa
- 👤 Ikunori Sakai
- 👤 Yasufumi Takasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:00
CPC Classifications
C; C08; C08L; C08L51/00; C08L51/06; C08L77/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
199 words
An impact-resistant polypropylene resin composition obtained by melt mixing: (a) 80-55 parts by weight of a modified polypropylene obtained by grafting a crystalline propylene-ethylene block copolymer having a melt index of 0.3-30 g/10 min and an ethylene content of 3-15% by weight with 0.03-5 parts by weight, base on 100 parts by weight of the crystalline propylene-ethylene block copolymer, of an unsaturated carboxylic acid or its derivative, or a crystalline polypropylene containing at least 5% by weight of the modified polypropylene, (b) 20-45 parts by weight of a polyamide having a melt viscosity η b 1.0-5.0 times the melt viscosity η a of the component (a) at the shear rate when the melt mixing of the components (a), (b) and (c) is effected, and (c) 2-60 parts by weight, based on 100 parts by weight of the total of the components (a) and (b), of a modified ethylene-α-olefin copolymer rubber obtained by grafting an ethylene-α-olefin copolymer rubber having a Mooney viscosity ML 1-4 (100° C.) of 10-150 and an ethylene content of 30∝90% by weight with 0.03-5 parts by weight, based on 100 parts by weight of the ethylene-α-olefin copolymer rubber, of an unsaturated carboxylic acid or its derivative.
Claim 2
Dependent Claim
199 words
An impact-resistant polypropylene resin composition obtained by melt mixing: (a) 80-55 parts by weight of a modified polypropylene obtained by grafting a crystalline propylene-ethylene block copolymer having a melt index of 0.3-30 g/10 min and an ethylene content of 3-15% by weight with 0.03-5 parts by weight, base on 100 parts by weight of the crystalline propylene-ethylene block copolymer, of an unsaturated carboxylic acid or its derivative, or a crystalline polypropylene containing at least 5% by weight of the modified polypropylene, (b) 20-45 parts by weight of a polyamide having a melt viscosity η b 1.0-5.0 times the melt viscosity η a of the component (a) at the shear rate when the melt mixing of the components (a), (b) and (c) is effected, and (c) 2-60 parts by weight, based on 100 parts by weight of the total of the components (a) and (b), of a modified ethylene-α-olefin copolymer rubber obtained by grafting an ethylene-α-olefin copolymer rubber having a Mooney viscosity ML 1-4 (100° C.) of 10-150 and an ethylene content of 30∝90% by weight with 0.03-5 parts by weight, based on 100 parts by weight of the ethylene-α-olefin copolymer rubber, of an unsaturated carboxylic acid or its derivative.
Claim 3
Dependent Claim
29 words
A composition according to claim 1, wherein the modified polypropylene has a monomer grafting degree of 0.03% by weight or more and a melt index of 0.5-200 g/10 min.
Claim 4
Dependent Claim
29 words
A composition according to claim 1, wherein the modified ethylene-α-olefin copolymer rubber has a monomer grafting degree of 0.05-5.0% by weight and a melt index of 0.01-20 g/10 min.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-28 | 1994-07-30 | 1995-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-28 | 1998-07-30 | 1999-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-28 | 2002-07-30 | 2003-01-29 | $7700.00 | Window Closed / Lapsed |