US4714735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oriented elastomeric film and method of manufacture
Assignee: ExxonMobil Chemical Patents Inc
•
Filing: 1985-05-08
•
Granted: 1987-12-22
•
Expires: 2005-05-08
Abstract
Abstract An oriented thermoplastic elastomer comprising an elastomer, EVA, and process oil is prepared by stretch orienting the film at an elevated temperature and annealing the film to freeze in stresses and strains in the film. In one embodiment, the thermoplastic elastomer is provided with a thin coating of a thermoplastic to provide nonblocking.
Inventors
- 👤 William J. Hodgson, Jr.
- 👤 Jeffrey A. Middlesworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:25
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C61/00; B29C61/003; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; B29K; B29K2023/00; B29K2023/04; B29K2023/08; B29K2023/083; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08; C08L23/0807; C08L23/0815; C08L91/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
79 words
An oriented film having a blend composition comprising from 10 to 40 weight percent of an olefinic elastomers, from 2 to 10 weight percent of a normally liquid process oil, and from 50 to 80 weight percent of a thermoplastic ethylene copolymer, said film being stretch oriented in draw ratio of between 1.3:1 and 6:1 and being dimensionally stable, thermally unstable in the stretch oriented condition and contractible to a thermally stable and elastic condition by application of heat.
Claim 2
Dependent Claim
79 words
An oriented film having a blend composition comprising from 10 to 40 weight percent of an olefinic elastomers, from 2 to 10 weight percent of a normally liquid process oil, and from 50 to 80 weight percent of a thermoplastic ethylene copolymer, said film being stretch oriented in draw ratio of between 1.3:1 and 6:1 and being dimensionally stable, thermally unstable in the stretch oriented condition and contractible to a thermally stable and elastic condition by application of heat.
Claim 3
Dependent Claim
60 words
A film as defined in claim 1 wherein the thermoplastic ethylene copolymer is selected from EVA, EAA and EMA and wherein the film has been stretch oriented in the transverse direction at a temperature not less than 100° F. and not more than 10° F. below the crystalline melting point of the copolymer and partially annealed in a stressed condition.
Claim 4
Dependent Claim
13 words
A film as defined in claim 2 wherein the ethylene copolymer is EVA.
Claim 5
Dependent Claim
70 words
A film as defined in claim 3 wherein the blend composition comprises from 15 to 30 weight percent of an olefinic elastomer selected from EPM and EPDM, from 60 to 80 weight percent of EVA having a vinyl acetate content of 9 to 40 weight percent, and from 2 to 10 weight percent of a normally liquid hydrocarbon process oil, the oil being an aromatic, naphthenic or paraffinic process oil.
Claim 6
Dependent Claim
41 words
A film as defined in claim 3 wherein the composition comprises from 20 to 30 weight percent of the olefinic elastomer, from 65 to 75 weight percent of the EVA, and from 4 to 8 weight percent of the processing oil.
Claim 7
Dependent Claim
27 words
A film as defined in claim 3 wherein the film has been stretch oriented in the transverse direction at a draw ratio of between 2:1 to 4:1.
Claim 8
Dependent Claim
25 words
A film as defined in claim 2 wherein the film has a shrink stress of at least 5,000 g/cm 2 at the stretch orientation temperature.
Claim 9
Dependent Claim
19 words
The film of claim 3 wherein the EVA has a VA content of between 15 and 35 wt %.
Claim 10
Dependent Claim
79 words
An oriented film having a blend composition comprising from 15 to 30 weight percent of an olefinic elastomer, from 2 to 10 weight percent of a normally liquid process oil, and from 60 to 80 weight percent of a thermoplastic ethylene copolymer, said film being stretch oriented in draw ratio of between 1.3:1 and 6:1 and being dimensionally stable, thermally unstable in the stretch oriented condition and contractible to a thermally stable and elastic condition by application of heat.
Claim 11
Dependent Claim
79 words
An oriented film having a blend composition comprising from 15 to 30 weight percent of an olefinic elastomer, from 2 to 10 weight percent of a normally liquid process oil, and from 60 to 80 weight percent of a thermoplastic ethylene copolymer, said film being stretch oriented in draw ratio of between 1.3:1 and 6:1 and being dimensionally stable, thermally unstable in the stretch oriented condition and contractible to a thermally stable and elastic condition by application of heat.
References Cited (Backward Citations)
US3378512A
Cited
US3927144A
Cited
US4132698A
Cited
US3941859A
Cited
US4116914A
Cited
US4212787A
Cited
US4277578A
Cited
US4220579A
Cited
US4303571A
Cited
JPS572350A
Cited
US4357439A
Cited
JPS57177038A
Cited
JPS57177039A
Cited
US4480061A
Cited
EP0119815A2
Cited
EP0119827A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-21 | 1991-06-22 | 1991-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-21 | 1995-06-22 | 1995-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-21 | 1999-06-22 | 1999-12-22 | $7700.00 | Window Closed / Lapsed |