Patent US3676528A successfully refreshed from Google Patents.
US3676528A
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Preparation of polymeric compositions of high impact resistance
Assignee: Montedison SpA
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Filing: 1970-12-07
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Granted: 1972-07-11
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Expires: 1990-12-07
Abstract
Abstract Graft polymers having high impact resistance are produced by polymerizing vinyl monomers in an aqueous emulsion of an olefinic rubber having a low degree of unsaturation, wherein the emulsion also contains an aromatic, aliphatic or cycloaliphatic hydrocarbon liquid stabilizer.
Inventors
- 👤 Febo Severini
- 👤 Alberto Valvassori
- 👤 Carlo Tavazzani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:02
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02; C08F255/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
21 words
The process of claim 1, wherein the olefinic rubber is a terpolymer of ethylene, propylene, and a cyclic or acyclic polyene.
Claim 2
Dependent Claim
34 words
The process of claim 2, wherein the polyene is selected from the group consisting of pentadiene-1,4; hexadiene-1,4; hexadiene-1,5; heptadiene-1,5; dodecatriene-1,7,9; methyl-heptadiene-1,5; 6-alkyliden-(O)-norbornene; norbornadiene-2,5; a 2-alkyl C1 - C4 -norbornadiene-2,5; cyclooctadiene-1,5; dicyclopentadiene, tetrahydroindene and 5-methyl-tetrahydroindene.
Claim 3
Dependent Claim
29 words
The process of claim 2, wherein the terpolymer has an ethylene content between about 20 and 80 mol percent and a molecular weight of from about 50,000 to 800,000.
Claim 4
Dependent Claim
29 words
The process of claim 2, wherein the terpolymer is crosslinked by heating the dispersion of the terpolymer in the presence of a crosslinking agent prior to the grafting reaction.
Claim 5
Dependent Claim
36 words
The process of claim 1, wherein the hydrocarbon liquid is selected from the group consisting of benzene, lower alkyl substituted benzenes, saturated and unsaturated acyclic hydrocarbons, saturated and unsaturated cyclic hydrocarbons, and mixtures of the foregoing.
Claim 6
Dependent Claim
34 words
The process of claim 1, wherein as hydrocarbon liquids are employed benzene and/or toluene, cyclohexane, n-butane, n-pentane, a mixture of pentanes, n-heptane or a mixture of benzene and/or toluene with n-heptane or with cyclohexane.
Claim 7
Dependent Claim
55 words
The process of claim 1, wherein the vinyl or vinylidene monomer is selected from the group consisting of styrene, a chlorostyrene, a methyl styrene, an ethyl styrene, alpha methyl styrene, acrylonitrile, methacrylonitrile, acrylic acid, methacrylic acid, an alkyl C1 - C8 acrylate, an alkyl C1 - C8 methacrylate, vinyl chloride, vinyl acetate and vinylidene chloride.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |