US4647627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low molecular weight copolymers and covulcanisates produced therefrom
Assignee: Bayer AG
•
Filing: 1985-08-28
•
Granted: 1987-03-03
•
Expires: 2005-08-28
Abstract
Abstract Statistical copolymers of from 85 to 52% by weight of a conjugated diene, from 15 to 48% by weight of at least one unsaturated nitrile and from 0 to 10% by weight of further monomers, copolymerizable with diene and nitrile, which have a molecular weight M n of from 0.5 to 30 kg/mol and a degree of hydrogenation of the double bonds of greater than 80%, give nitrile rubbers, which are mixed and colvulcanized with these copolymers, an increased ozone resistance.
Inventors
- 👤 Hartmuth Buding
- 👤 Zsolt Szentivanyi
- 👤 Joachim Thormer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:24
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/02; C08L; C08L9/00; C08L9/02; C08L15/00; C08L15/005; C08L2205/00; C08L2205/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
Mixtures of (A) from 90 to 55% by weight of butadiene-acrylonitrile-copolymers with acrylonitrile contents of from 18 to 49% by weight and a minimum Mooney viscosity ML 1+4/100° C. of 25 ME and (B) from 10 to 45% by weight of statistical copolymers of from 85 to 52% by weight of at least one conjugated diene, from 15 to 48% by weight of at least one unsaturated nitrile and from 0 to 10% by weight of at least one further monomer copolymerisable with diene and nitrile, the statistical copolymers have an average molecular weight (number average) of from 0.5 to 30 kg/mol with a degree of hydrogenation of the double bonds of greater than 80%.
Claim 2
Dependent Claim
115 words
Mixtures of (A) from 90 to 55% by weight of butadiene-acrylonitrile-copolymers with acrylonitrile contents of from 18 to 49% by weight and a minimum Mooney viscosity ML 1+4/100° C. of 25 ME and (B) from 10 to 45% by weight of statistical copolymers of from 85 to 52% by weight of at least one conjugated diene, from 15 to 48% by weight of at least one unsaturated nitrile and from 0 to 10% by weight of at least one further monomer copolymerisable with diene and nitrile, the statistical copolymers have an average molecular weight (number average) of from 0.5 to 30 kg/mol with a degree of hydrogenation of the double bonds of greater than 80%.
Claim 3
Dependent Claim
14 words
Covulcanisates of the mixtures according to claim 1, produced by peroxidic or sulphur cross-linking.
References Cited (Backward Citations)
US4421884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |