Patent US3721724A successfully refreshed from Google Patents.
US3721724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber modified olefinic nitrile-vinyl aromatic-maleimide interpolymers
Assignee: Standard Oil Co
•
Filing: 1970-09-22
•
Granted: 1973-03-20
•
Expires: 1990-09-22
Abstract
Abstract Interpolymers having high impact strength, high softening temperature and other excellent properties result from the polymerization of an olefinic nitrile such as acrylonitrile, a vinyl aromatic monomer such as styrene, and maleimide in the presence of a conjugated diolefin elastomer.
Inventors
- 👤 C Uebele
- 👤 R Griffith
- 👤 I Rosen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:28
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
11 words
The composition of claim 1 wherein the nitrile monomer is acrylonitrile.
Claim 2
Dependent Claim
12 words
The composition of claim 2 wherein the vinyl aromatic monomer is styrene.
Claim 3
Dependent Claim
12 words
The composition of claim 3 wherein the conjugated diolefin elastomer is polybutadiene.
Claim 4
Dependent Claim
157 words
The process comprising polymerizing with a polymerization initiator in an aqueous emulsion with an emulsifying agent in the substantial absence of molecular oxygen at a temperature in the range of about 0*C to 100*C a mixture of 100 parts by weight of A. an olefinically unsaturated nitrile monomer having the structure wherein R represents hydrogen, a lower alkyl group and a halogen, and B. from 0.5 to 10 moles per mole of (A) of a vinyl aromatic monomer, and C. from 0.2 to 2.5 moles per mole of (A) of maleimide, and from about 1 to 25 parts by weight of a conjugated diolefin elastomer composed of 50 percent or more by weight of a polymerized conjugated diene monomer selected from the group consisting of butadiene-1,3, isoprene, chloroprene, piperylene and cyanoprene and up to 50 percent by weight of one or more comonomers selected from the group consisting of acrylonitrile, methacrylonitrile, styrene, alpha--methyl styrene, and ethyl acrylate.
Claim 5
Dependent Claim
11 words
The process of claim 5 wherein the nitrile monomer is acrylonitrile.
Claim 6
Dependent Claim
12 words
The process of claim 6 wherein the vinyl aromatic monomer is styrene.
Claim 7
Dependent Claim
12 words
The process of claim 7 wherein the conjugated diolefin elastomer is polybutadiene.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |