Patent US3943192A successfully refreshed from Google Patents.
US3943192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastomeric blends
Assignee: Polysar Ltd
•
Filing: 1973-08-20
•
Granted: 1976-03-09
•
Expires: 1993-08-20
Abstract
Abstract In the blending of a polymer of chloroprene with a lesser proportion of a diene/nitrile rubbery copolymer, a composition of much improved processing, as for example ease of handling on a mill and uniformity of mixing, is obtained when the nitrile copolymer is selected as a copolymer of about 55-80 mole % of a 2-alkyl butadiene-1,3 and about 20-45 mole % of an acrylic nitrile.
Inventors
- 👤 Douglas Coulthard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:59
CPC Classifications
C; C08; C08L; C08L11/00; C08L9/00; C08L9/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
A chloroprene polymer composition of improved processabiity comprising a blend of (A) about 90-65 parts by weight of a rubbery chloroprene polymer and (B) about 10-35 parts by weight of rubbery copolymer of 55-80 parts by weight of a 2-alkyl butadiene-1,3 where the alkyl group contains 1-5 carbon atoms with 45-20 parts by weight of an acrylic nitrile of the general formula CH 2 = C(R) - CN where R is selected from hydrogen, C 1 -C 3 alkyl, halogen and cyano radicals.
Claim 2
Dependent Claim
83 words
A chloroprene polymer composition of improved processabiity comprising a blend of (A) about 90-65 parts by weight of a rubbery chloroprene polymer and (B) about 10-35 parts by weight of rubbery copolymer of 55-80 parts by weight of a 2-alkyl butadiene-1,3 where the alkyl group contains 1-5 carbon atoms with 45-20 parts by weight of an acrylic nitrile of the general formula CH 2 = C(R) - CN where R is selected from hydrogen, C 1 -C 3 alkyl, halogen and cyano radicals.
Claim 3
Dependent Claim
16 words
A composition as claimed in claim 1 wherein the chloroprene polymer is a homopolymer of chloroprene.
Claim 4
Dependent Claim
20 words
A composition as claimed in claim 2 wherein the rubbery copolymer of (B) is a copolymer of isoprene and acrylonitrile.
Claim 5
Dependent Claim
8 words
A vulcanizate of the compositon of claim 3.
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) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |