Patent US3607842A successfully refreshed from Google Patents.
US3607842A
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Copolymers of a conjugated diene and maleic anhydride
Assignee: Honeywell International Inc
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Filing: 1969-07-18
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Granted: 1971-09-21
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Expires: 1989-07-18
Abstract
Abstract Substantially equimolar copolymers of a conjugated diene, such as butadiene, and a comonomer which is maleic anhydride or acrylonitrile can be prepared by copolymerizing the conjugated diene and the comonomer in an inert organic solvent in the presence of a Ziegler-type catalyst. The reaction proceeds rapidly at room temperature to yield a copolymer which is useful to form shaped articles.
Inventors
- 👤 Chester L Parris
- 👤 Leo S Rieve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:29
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44; C08F22/00; C08F22/04; C08F236/00; C08F236/02; C08F236/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
44 words
The process of claim 1 wherein the organometallic compound is aluminum, beryllium, lithium or zinc lower alkyl, lower alkyl hydride or lower alkyl halide and the compound of the transition metal is an organic complex of a metal selected from the first transition series.
Claim 2
Dependent Claim
34 words
The process of claim 2 wherein the organometallic compound is aluminum tri(lower alkyl) or aluminum lower alkyl halide and the compound of the transition metal is an organic complex of cobalt, iron or nickel.
Claim 3
Dependent Claim
22 words
The process of claim 3 wherein the mol ratio of transition metal to conjugated diene and comonomer ranges from 0.0:1 tO 0.01:1.
Claim 4
Dependent Claim
20 words
The process of claim 4 wherein the mol ratio of organometallic compound to transition metal ranges from 1:1 to 10:1.
Claim 5
Dependent Claim
14 words
The process of claim 5 wherein the conjugated diene is butadiene, piperylene, or isoprene.
Claim 6
Dependent Claim
76 words
A moldable copolymer consisting essentially of recurring units derived from (A) a conjugated diene having the formula wherein each X independently is hydrogen or halogen and each R independently is hydrogen, halogen, lower alkyl or phenyl and (B) maleic anhydride, the molar ratio of the recurring units derived from (A) and (B) being substantially 1:1, said copolymer having an infrared spectrum having substantially no absorption bands at frequencies which indicate the presence of carbon-carbon double bonds.
Claim 7
Dependent Claim
14 words
The copolymer of claim 7 wherein the conjugated diene is butadiene, piperylene, or isoprene.
Claim 8
Dependent Claim
11 words
The copolymer of claim 7 wherein the conjugated diene is butadiene.
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 |