US4812526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact polypropylene
Assignee: Union Carbide Chemicals and Plastics Technology LLC
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Filing: 1987-06-08
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Granted: 1989-03-14
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Expires: 2007-06-08
Abstract
Abstract An impact polypropylene composition comprising: (i) isotactic polypropylene; and (ii) a copolymer of ethylene and an alpha-olefin comonomer having 3 to 8 carbon atoms, said copolymer (a) having a density of about 0.87 to about 0.90 gram per cubic centimeter and a crystallinity in the range of about 20 to about 35 percent by weight based on the weight of the copolymer and (b) being present in the composition in the range of about 20 to about 50 percent by weight based on the weight of the polypropylene. e
Inventors
- 👤 Mahmoud R. Rifi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:11
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
101 words
A molded product exhibiting a blush of less than about 0.4 inch per 10 pounds and a Gardner Impact of at least about 175 inch-pounds comprising: (i) isotactic polypropylene; and (ii) a copolymer of ethylene and 1-butene, said copolymer (a) having a density of about 0.87 to about 0.90 gram per cubic centimeter and a crystallinity in the range of about 20 to about 35 percent by weight based on the weight of the copolymer and (b) being present in the composition in the range of about 20 to about 50 percent by weight based on the weight of the polypropylene.
Claim 2
Dependent Claim
101 words
A molded product exhibiting a blush of less than about 0.4 inch per 10 pounds and a Gardner Impact of at least about 175 inch-pounds comprising: (i) isotactic polypropylene; and (ii) a copolymer of ethylene and 1-butene, said copolymer (a) having a density of about 0.87 to about 0.90 gram per cubic centimeter and a crystallinity in the range of about 20 to about 35 percent by weight based on the weight of the copolymer and (b) being present in the composition in the range of about 20 to about 50 percent by weight based on the weight of the polypropylene.
Claim 3
Dependent Claim
37 words
The molded product defined in claim 1 wherein the portion of the copolymer based on 1-butene is present in the range of about 15 to about 60 percent by weight based on the weight of the copolymer.
Claim 4
Dependent Claim
37 words
The molded product defined in claim 2 wherein the portion of the copolymer based on 1-butene is present in the range of about 20 to about 45 percent by weight based on the weight of the copolymer.
References Cited (Backward Citations)
US3758643A
Cited
EP0077532A2
Cited
JPS58157839A
Cited
WO1984003888A1
Cited
EP0170255A1
Cited
US4734459A
Cited
US4732940A
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JPH103478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |