US3607981A
Expired / Lapsed
US
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Nitrile rubbers
Assignee: Goodrich Corp
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Filing: 1969-10-28
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Granted: 1971-09-21
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Expires: 1989-10-28
Abstract
Abstract Improved nitrile rubbers that are readily processed, have an excellent balance of low temperature-oil swell properties and other good physical properties are prepared polymerizing a polar monomer as acrylonitrile or methacrylonitrile with a mixture of (1) an elastomer of a conjugated diene and a nitrile and (2) a polymer of a conjugated diene and a nitrile having a molecular weight below 20,000. This low molecular weight copolymer may also be liquid xanthate-, mercaptan- or carboyxl-terminated polymers.
Inventors
- 👤 Roger E Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:32
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
The composition of claim 1 wherein (1) is a copolymer of butadiene-1,3 containing about 10 to 30 weight percent acrylonitrile, (2) is a copolymer of butadiene-1,3 and acrylonitrile in amount from about 10 to about 40 weight percent and the molecular weight is below 5,000 and (3) is selected from the group consisting of acrylonitrile, methacrylonitrile and mixtures of acrylonitrile, and methacrylonitrile with methyl methacrylate.
Claim 2
Dependent Claim
57 words
The polymer composition of claim 2 wherein (1) contains about 15 to 25 weight percent acrylonitrile, (2) contains about 20 to 40 weight percent acrylonitrile and is present in amount of about 10 to 20 weight percent with 80 to 90 weight percent of (1), and is acrylonitrile in amount from about 10 to 20 weight percent.
Claim 3
Dependent Claim
39 words
The composition of claim 2 wherein (3) is selected from the group consisting of acrylonitrile, methacrylonitrile and methyl methacrylate in ratios of acrylonitrile to methacrylonitrile of 0/100 to 60/40 and acrylonitrile/methyl methacrylate in ratios of from 100/0 to 50/50.
Claim 4
Independent Claim
139 words
A method for preparing improved polymers comprising polymerizing, in the presence of a mixture of (1) 60 to 95 weight percent of an elastomer containing a major proportion of a conjugated diene and a nitrile and (2) about 5 to 40 weight percent of a polymer containing a major proportion of a conjugated diene and nitrile and having a molecular weight of about 1,000 to less than 20,000, a nitrile copolymerized with (1) and (2) in amounts to provide an amount copolymeRized with (1) and (2) of about 2 to 30 weight percent of said nitrile, said polymerization conducted with a free-radical catalyst, a mercaptan modifier and from 0.1 to 5 times the total weight of (1) and (2) of the nitrile so that an excess of nitrile is charged over that desired to polymerize with (1) and (2).
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |