US4232132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastomeric thermoplastic mixtures of polypropylene and ethylene/vinyl acetate copolymers
Assignee: Bayer AG
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Filing: 1979-03-12
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Granted: 1980-11-04
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Expires: 1999-03-12
Abstract
Abstract An elastomeric thermoplastic mixture comprising (A) from 40 to 95% by weight of polypropylene, and (B) from 5 to 60% by weight of a partially cross-linked ethylene/vinyl acetate copolymer which has a gel content of from 3 to 50% by weight and a vinyl acetate content of from 20 to 80% by weight, the percentages being based on the sum of A+B.
Inventors
- 👤 Ulrich Grigo
- 👤 Josef Merten
- 👤 Rudolf Binsack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:40
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L2312/00; C08L31/00; C08L31/02; C08L31/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
An elastomeric thermoplastic mixture consisting of (A) from 40 to 95% by weight of polypropylene which is greater than 90% isotactic and (B) from 5 to 60% by weight of an ethylene/vinyl acetate copolymer having a vinyl acetate content of from 20 to 80% by weight, said copolymer having been partially cross-linked to a gel content of 3 to 50% by weight before admixture with said polypropylene.
Claim 2
Dependent Claim
67 words
An elastomeric thermoplastic mixture consisting of (A) from 40 to 95% by weight of polypropylene which is greater than 90% isotactic and (B) from 5 to 60% by weight of an ethylene/vinyl acetate copolymer having a vinyl acetate content of from 20 to 80% by weight, said copolymer having been partially cross-linked to a gel content of 3 to 50% by weight before admixture with said polypropylene.
Claim 3
Dependent Claim
25 words
An elastomeric thermoplastic mixture as claimed in claim 1, wherein the ethylene/vinyl acetate copolymer has a gel content of from 5 to 40% by weight.
Claim 4
Dependent Claim
24 words
An elastomeric thermoplastic mixture as claimed in claim 1, wherein the ethylene/vinyl acetate copolymer contains from 25 to 60% by weight of vinyl acetate.
Claim 5
Dependent Claim
34 words
An elastomeric thermoplastic mixture as claimed in claim 1, comprising: (A) from 55 to 90% by weight of polypropylene, and (B) from 10 to 45% by weight of the partially cross-linked ethylene/vinyl acetate copolymer.
Claim 6
Dependent Claim
33 words
An elastomeric thermoplastic mixture as claimed in claim 1, wherein the polypropylene has a melt index (IMI) of from 3 to 20 g/10 min. at 230° C. under a load of 5 kg.
Claim 7
Dependent Claim
41 words
An elastomeric thermoplastic mixture as claimed in claim 1, wherein the ethylene/vinyl acetate copolymer has been partially crosslinked in the presence, as a crosslinking agent, of an organic peroxide having a half-life period of more than 10 min. at 100° C.
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) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |