Patent US4593286A successfully refreshed from Google Patents.
US5086121A
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Dynamically cured thermoplastic olefin polymers
Assignee: Advanced Elastomer Systems LP
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Filing: 1990-07-20
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Granted: 1992-02-04
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Expires: 2010-07-20
Abstract
Abstract Thermoplastic compositions of matter useful as gasketing materials as well as flexible boots and seals which are soft, have low compression set and high tensile. The compositions comprise a polyolefin resin and at least two different rubbers, one of which is vulcanized to a fully cured state by a cure systems which leaves the other rubber(s) unvulcanized. The preferred embodiment comprises a blend of polypropylene and ethylene vinylacetate as the polyolefin resin component, EPDM as the uncured rubber component and a ZnO cured halogenated butyl rubber. In another embodiment of the invention, the resin is excluded and the uncured rubber is a high crystallinity EPDM.
Inventors
- 👤 Donald R. Hazelton
- 👤 Robert C. Puydak
- 👤 D. A. Booth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:01
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/16; C08L23/26; C08L23/28; C08L23/283; C08K; C08K3/00; C08K3/01; C08K3/011; C08K3/18; C08K3/20; C08K3/22; C08L2205/00; C08L2205/02; C08L2205/03; C08L2205/035; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L23/10; C08L23/12; C08L23/18; C08L23/20; C08L23/22; C08L91/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
A process for preparing a thermoplastic composition comprising a polyolefin resin, which is a blend of polypropylene with EVA or an etylene-methacrylate copolymer, and at least two rubbers, at least one of said rubbers being vulcanized by a vulcanizing agent which will vulcanize at least one of said rubbers leaving at least one of said rubbers in an unvulcanized state which comprises: (a) intimately mixing the polyolefin resin with at least one first rubber at a temperature above the softening point o the polyolefin resin; (b) adding to the intimate mixture of resin and rubber a vulcanizing agent for at least one first rubber; (c) vulcanizing the rubber by dynamic vulcanization for a time sufficient to fully vulcanize the rubber; and (d) blending into the dynamically vulcanized rubber-polyolefin resin composition at least one second rubber at a temperature above the softening point o the polyolefin resin.
Claim 2
Dependent Claim
146 words
A process for preparing a thermoplastic composition comprising a polyolefin resin, which is a blend of polypropylene with EVA or an etylene-methacrylate copolymer, and at least two rubbers, at least one of said rubbers being vulcanized by a vulcanizing agent which will vulcanize at least one of said rubbers leaving at least one of said rubbers in an unvulcanized state which comprises: (a) intimately mixing the polyolefin resin with at least one first rubber at a temperature above the softening point o the polyolefin resin; (b) adding to the intimate mixture of resin and rubber a vulcanizing agent for at least one first rubber; (c) vulcanizing the rubber by dynamic vulcanization for a time sufficient to fully vulcanize the rubber; and (d) blending into the dynamically vulcanized rubber-polyolefin resin composition at least one second rubber at a temperature above the softening point o the polyolefin resin.
Claim 3
Dependent Claim
118 words
A process for preparing a thermoplastic composition comprising a polyolefin resin and t least two rubbers comprising: (a) intimately mixing at least one first rubber with at least one second rubber at a temperature above the softening points of said rubbers; (b) adding to the intimate mixture of rubbers a vulcanizing agent which is a vulcanizing agent for at least one first rubber but not for said second rubber; (c) vulcanizing the rubber by dynamic vulcanization for a time sufficient to fully cure said first rubber; and (d) blending the dynamically vulcanized rubber composition with at least one polyolefin resin at a temperature above the melting point of the resin, wherein the first rubber is an halogenated rubber.
Claim 4
Dependent Claim
118 words
A process for preparing a thermoplastic composition comprising a polyolefin resin and t least two rubbers comprising: (a) intimately mixing at least one first rubber with at least one second rubber at a temperature above the softening points of said rubbers; (b) adding to the intimate mixture of rubbers a vulcanizing agent which is a vulcanizing agent for at least one first rubber but not for said second rubber; (c) vulcanizing the rubber by dynamic vulcanization for a time sufficient to fully cure said first rubber; and (d) blending the dynamically vulcanized rubber composition with at least one polyolefin resin at a temperature above the melting point of the resin, wherein the first rubber is an halogenated rubber.
Claim 5
Dependent Claim
14 words
The process according to claim 2 wherein the first rubber is chlorinated butyl rubber.
Claim 6
Dependent Claim
13 words
The process according to claim 2 wherein the second rubber is an EPDM.
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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) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |