Patent US3975458A successfully refreshed from Google Patents.
US3975458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graft polymers of vinyl chloride on unsaturated olefinic elastomers and process for the preparation thereof
Assignee: Montedison SpA
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Filing: 1974-12-09
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Granted: 1976-08-17
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Expires: 1994-12-09
Abstract
Abstract Impact resistant compositions comprising crude graft polymers of vinyl chloride on unsaturated olefinic elastomers, said elastomers being copolymers of ethylene, an alpha -olefin and a diene or a polyene, are prepared by graft polymerizing vinyl chloride onto an olefinic elastomer. The graft polymerization is discontinued before 70% of the vinyl chloride has been polymerized.
Inventors
- 👤 Febo Severini
- 👤 Alberto Valvassori
- 👤 Alberto Pagliari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:18
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02; C08F255/06; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L23/00; C08L23/02; C08L23/16; C08L51/00; C08L51/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
An impact resistant polymeric composition comprising a mixture of the following components: a. a preformed vinyl chloride homopolymer, and b. a crude graft product obtained by grafting vinyl chloride onto an elastomeric copolymer of ethylene, an α-olefin and a minor amount of a cyclic or acyclic diene or polyene, said crude graft product comprising (1) vinyl chloride homopolymer, (2) a graft copolymer of vinyl chloride on an elastomeric copolymer, said graft copolymer comprising from 15 to 60% by weight of vinyl chloride, and (3) an unmodified elastomeric copolymer; said composition having a melt index (determined according to ASTM D 1238 at 185°C. with a load of 23.5 kg.) greater than 1, and containing from 5 to 15% of total rubber, which is defined as the sum of the amounts of elastomeric copolymer contained in components (2) and (3) of the crude graft product.
Claim 2
Dependent Claim
143 words
An impact resistant polymeric composition comprising a mixture of the following components: a. a preformed vinyl chloride homopolymer, and b. a crude graft product obtained by grafting vinyl chloride onto an elastomeric copolymer of ethylene, an α-olefin and a minor amount of a cyclic or acyclic diene or polyene, said crude graft product comprising (1) vinyl chloride homopolymer, (2) a graft copolymer of vinyl chloride on an elastomeric copolymer, said graft copolymer comprising from 15 to 60% by weight of vinyl chloride, and (3) an unmodified elastomeric copolymer; said composition having a melt index (determined according to ASTM D 1238 at 185°C. with a load of 23.5 kg.) greater than 1, and containing from 5 to 15% of total rubber, which is defined as the sum of the amounts of elastomeric copolymer contained in components (2) and (3) of the crude graft product.
Claim 3
Dependent Claim
26 words
A composition according to claim 1, wherein the olefinic elastomer is a terpolymer of ethylene, propylene and at least one cyclic or acyclic diene or polyene.
Claim 4
Dependent Claim
37 words
A composition according to claim 2, wherein the olefinic elastomer is a terpolymer of ethylene, propylene and at least one member selected from the group consisting of butadiene, a 6-alkylidenenorbornene, norbornadiene-2,5, a 2-alkylnorbornadiene-2,5, cyclooctadiene-1,5, tetrahydroindene and 5-methyl-tetrahydroindene.
Claim 5
Dependent Claim
47 words
A process for preparing a composition according to claim 1, comprising mixing a preformed vinyl chloride homopolymer with a crude graft product obtained by graft polymerizing vinyl chloride onto an olefinic elastomer, wherein the polymerization is discontinued when the vinyl chloride conversion is not higher than 70%.
Claim 6
Dependent Claim
21 words
A process according to claim 4, wherein the polymerization is discontinued when the vinyl chloride conversion is between 30% and 70%.
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) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |