US4251646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic blend of polypropylene, EPM and propylene-ethylene copolymer
Assignee: Advanced Elastomer Systems LP
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Filing: 1979-07-27
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Granted: 1981-02-17
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Expires: 1999-07-27
Abstract
Abstract Thermoplastic polymer blends of improved impact strength and knit line toughness consisting essentially of (a) 60-90% by weight polypropylene, (b) 30-35% by weight of thermoplastic crystalline heteroblock propylene-ethylene copolymer and (c) 30-35% by weight of an ethylene-propylene copolymer rubber.
Inventors
- 👤 William S. Smith, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:50
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L2205/00; C08L2205/03; C08L23/14; C08L23/142; C08L23/16; C08L53/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
58 words
A thermoplastic polymer blend exhibiting improved bulk material toughness and knit line toughness properties consisting essentially of (a) 60 to 90% by weight of polypropylene, (b) 30% to 5% by weight of a thermoplastic crystalline heteroblock propylene-ethylene copolymer, and (c) 30% to 5% by weight of a ethylene-propylene copolymer rubber containing about 30% to 80% by weight ethylene.
Claim 2
Dependent Claim
58 words
A thermoplastic polymer blend exhibiting improved bulk material toughness and knit line toughness properties consisting essentially of (a) 60 to 90% by weight of polypropylene, (b) 30% to 5% by weight of a thermoplastic crystalline heteroblock propylene-ethylene copolymer, and (c) 30% to 5% by weight of a ethylene-propylene copolymer rubber containing about 30% to 80% by weight ethylene.
Claim 3
Dependent Claim
18 words
The blend of claim 1 wherein the ethylene-propylene copolymer rubber contains about 40% to 65% by weight ethylene.
Claim 4
Dependent Claim
20 words
The blend of claim 1 wherein the thermoplastic crystalline heteroblock propylene-ethylene copolymer contains about 60% to 95% by weight propylene.
Claim 5
Dependent Claim
28 words
The blend of claim 1 wherein there is present about 85% of said (a) component, about 10% of said (b) component, and about 5% of said (c) component.
Claim 6
Dependent Claim
28 words
The blend of claim 1 wherein there is present about 80% of said (a) component, about 10% of said (b) component and about 10% of said (c) component.
References Cited (Backward Citations)
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Cited
CA684541A
Cited
US3036987A
Cited
US3478128A
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US3632674A
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US3882197A
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US4036912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |