US4500681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic blend of polyolefin, isobutylene-backbone elastomer and ethylene copolymer
Assignee: Advanced Elastomer Systems LP
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Filing: 1982-12-27
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Granted: 1985-02-19
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Expires: 2002-12-27
Abstract
Abstract Compositions of matter comprising a thermoplastic elastomeric blend of a polyolefin component, an isobutylene-backbone elastomer component, and a copolymer component of ethylene and an unsaturated ester of a lower carboxylic acid. Useful in the preparation of film, molded and extruded articles. The incorporation of an ethylene copolymer component, such as ethylene vinyl acetate, ethylene methyl acrylate, etc., results in compositions with the advantages of elastomer modified polyolefin blends, but which exhibit lower melt viscosity and improved processability.
Inventors
- 👤 Cindy B. Shulman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:14
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08K; C08K3/00; C08K3/18; C08K3/24; C08K3/26; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L23/10; C08L23/18; C08L23/20; C08L23/22; C08L23/26; C08L23/28; C08L23/283; C08L2205/00; C08L2205/03; C08L2205/035
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
75 words
A thermoplastic elastomeric blend composition comprising: (a) from about 20 to about 65 weight percent isotactic polypropylene or polypropylene reactor copolymer containing about 1 to about 20 weight percent of an alpha-olefin comonomer or mixtures thereof, (b) from about 20 to about 60 weight percent of an isobutylene-backbone elastomer component, and (c) from about 7 to about 40 weight percent of a copolymer component of ethylene and an unsaturated ester of a lower carboxylic acid.
Claim 2
Dependent Claim
75 words
A thermoplastic elastomeric blend composition comprising: (a) from about 20 to about 65 weight percent isotactic polypropylene or polypropylene reactor copolymer containing about 1 to about 20 weight percent of an alpha-olefin comonomer or mixtures thereof, (b) from about 20 to about 60 weight percent of an isobutylene-backbone elastomer component, and (c) from about 7 to about 40 weight percent of a copolymer component of ethylene and an unsaturated ester of a lower carboxylic acid.
Claim 3
Dependent Claim
25 words
The composition of claim 1 wherein said isobutylene-backbone elastomer is selected from the group consisting of polyisobutylene, butyl rubber, halogenated butyl rubber and mixtures thereof.
Claim 4
Dependent Claim
14 words
The composition of claim 2 wherein said butyl rubber is an isobutylene isoprene copolymer.
Claim 5
Dependent Claim
20 words
The composition of claim 2 wherein said polyisobutylene has a Staudinger molecular weight of from about 50,000 to about 150,000.
Claim 6
Dependent Claim
26 words
The composition of claim 1 wherein said unsaturated ester of a lower carboxylic acid is selected from the group consisting of vinyl esters and alkyl acrylates.
Claim 7
Dependent Claim
12 words
The composition of claim 5 wherein said vinyl ester comprises vinyl acetate.
Claim 8
Dependent Claim
21 words
The composition of claim 5 wherein said alkyl acrylate is selected from the group consisting of methyl acrylate and ethyl acrylate.
Claim 9
Dependent Claim
23 words
The composition of claim 6 wherein said vinyl acetate is present at a concentration of from about 9 to about 45 weight percent.
Claim 10
Dependent Claim
18 words
The composition of claim 1 wherein (a) is present from about 25 to about 60 percent by weight.
Claim 11
Dependent Claim
20 words
The composition of claim 1 wherein said isobutylene-backbone elastomer is present from about 25 to about 55 percent by weight.
Claim 12
Dependent Claim
21 words
The composition of claim 1 wherein said ethylene copolymer component is present from about 10 to about 35 percent by weight.
Claim 13
Dependent Claim
20 words
The composition of claim 1 wherein said polypropylene reactor copolymer includes ethylene from about 1 to about 20 weight percent.
Claim 14
Dependent Claim
13 words
The composition of claim 11 wherein said ethylene copolymer is ethylene vinyl acetate.
Claim 15
Dependent Claim
11 words
The composition of claim 7 wherein said isobutylene-backbone elastomer is polyisobutylene.
Claim 16
Dependent Claim
19 words
The composition of claim 14 wherein said polyisobutylene is present from about 25 to about 55 percent by weight.
Claim 17
Dependent Claim
9 words
The composition of claim 14 wherein (a) is polypropylene.
Claim 18
Dependent Claim
19 words
The composition of claim 16 wherein said polypropylene is present from about 25 to about 60 percent by weight.
Claim 19
Dependent Claim
9 words
A film produced from the composition of claim 1.
Claim 20
Dependent Claim
9 words
A film produced from the composition of claim 17.
Claim 21
Dependent Claim
10 words
An extruded article produced from the composition of claim 1.
Claim 22
Dependent Claim
10 words
An extruded article produced from the composition of claim 17.
Claim 23
Dependent Claim
10 words
A molded article produced from the composition of claim 1.
Claim 24
Dependent Claim
10 words
A molded article produced from the composition of claim 17.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |