Patent US4243576A successfully refreshed from Google Patents.
US4243576A
Expired / Lapsed
US
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Blends of ethylene-vinyl acetate copolymer rubbers with elastomers
Assignee: Equistar Chemicals LP
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Filing: 1979-04-02
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Granted: 1981-01-06
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Expires: 1999-04-02
Abstract
Abstract The Mooney viscosity and green strength of ethylene-vinyl acetate (EVA) copolymer gum stock is improved by the addition thereto of a suitable elastomer such as: high viscosity ethylene propylene rubber (EPR); nitrile rubber; polychloroprene; polyacrylate rubber; polyurethane; chlorinated polyethylene; polyester; ethylene-propylene diene monomer (EPDM) terpolymer; and other elastomers such as ethylene-methyl acrylate, ethylene butyl acrylate and acrylonitrile types.
Inventors
- 👤 Joseph Fischer
- 👤 John M. Hoyt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:09
CPC Classifications
C; C08; C08L; C08L31/00; C08L31/02; C08L31/04; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L21/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
A polymer blend demonstrating improved Mooney viscosity and green strength comprising from about 90% to about 60% by weight of an amorphous ethylene-vinyl acetate copolymer containing from about 40% to about 60% copolymerized vinyl acetate by weight, and from about 10% to about 40% by weight of a modifying elastomer having a Mooney viscosity of from about 65 to about 115 ML 1+4 at 100° C. wherein the modifying elastomer is selected from the group consisting of high viscosity ethylene propylene rubber and ethylene-propylene diene monomer terpolymer.
Claim 2
Dependent Claim
87 words
A polymer blend demonstrating improved Mooney viscosity and green strength comprising from about 90% to about 60% by weight of an amorphous ethylene-vinyl acetate copolymer containing from about 40% to about 60% copolymerized vinyl acetate by weight, and from about 10% to about 40% by weight of a modifying elastomer having a Mooney viscosity of from about 65 to about 115 ML 1+4 at 100° C. wherein the modifying elastomer is selected from the group consisting of high viscosity ethylene propylene rubber and ethylene-propylene diene monomer terpolymer.
Claim 3
Dependent Claim
39 words
The polymer blend of claim 1 demonstrating in increase in Mooney viscosity of from about 10% up to about 100% as compared to the Mooney viscosity of the ethylene-vinyl acetate copolymer prior to the addition of the modifying elastomer.
Claim 4
Dependent Claim
23 words
The polymer blend of claim 1 wherein the ethylene-vinyl acetate copolymer contains from about 50% to about 70% copolymerized vinyl acetate by weight.
Claim 5
Dependent Claim
29 words
The polymer blend of claim 1 crosslinked by the addition of from 1.0 parts to about 10.0 parts per hundred parts of said blend of a peroxide crosslinking agent.
Claim 6
Dependent Claim
44 words
The polymer blend of claim 5 crosslinked by the addition of from 2.0 parts to about 5 parts of a peroxide crosslinking agent selected from the group consisting of t-butyl perbenzoate, dicumyl peroxide; 2,5-dimethyl-2,5-di(t-butyl peroxy)hexyne-3; 1,3,5-tris[alpha,alpha-dimethyl-alpha-(t-butyl peroxy)]-methyl benzene; alpha,alpha'-bis(t-butyl peroxy)diisopropyl benzene; and, n-butyl-4,4-bis(t-butyl peroxy)valerate.
Claim 7
Dependent Claim
25 words
The polymer blend of claim 1 containing from about 5.0 parts to about 400.0 parts of filler per 100 parts of polymer blend by weight.
Claim 8
Dependent Claim
49 words
The polymer blend of claim 6 containing from about 100.0 parts to about 150.0 parts per 100 parts of polymer blend of a filler selected from the group consisting of talc, surface treated (silane) calcined kaolin clay, antimony oxide, alumina trihydrate, hydrated silica, carbon black and sintered colloidal silica.
Claim 9
Dependent Claim
20 words
The polymer blend of claim 1 containing from about 0.1 parts to about 4.0 parts by weight of an antioxidant.
Claim 10
Dependent Claim
21 words
The polymer blend of claim 8 containing about 1.0 parts per hundred parts of said blend of polymerized trimethyl dihydroquinoline antioxidant.
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) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |