Patent US4454307A successfully refreshed from Google Patents.
US4454307A
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Elimination process
Assignee: Imperial Chemical Industries Ltd
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Filing: 1983-09-09
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Granted: 1984-06-12
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Expires: 2003-09-09
Abstract
Abstract A process for the preparation of polyarylenes by the amine-catalyzed elimination of carbonate groups from polymers which contain in the backbone thereof cyclohex-2-enylene rings bearing carbonate groups is disclosed. The products of the process are particularly useful as insulating materials.
Inventors
- 👤 Phillip Cheshire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:30
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
63 words
A process for the preparation of a polymer having aromatic rings in the backbone thereof which process comprises treating a polymeric composition comprising a polymer which has cyclohex-2-enylene rings bearing carbonate groups at the 5,6 ring positions in the polymer backbone with a suitable organic amine such that the carbonate groups are eliminated from at least substantially all of the said cyclohexenylene rings.
Claim 2
Dependent Claim
63 words
A process for the preparation of a polymer having aromatic rings in the backbone thereof which process comprises treating a polymeric composition comprising a polymer which has cyclohex-2-enylene rings bearing carbonate groups at the 5,6 ring positions in the polymer backbone with a suitable organic amine such that the carbonate groups are eliminated from at least substantially all of the said cyclohexenylene rings.
Claim 3
Dependent Claim
97 words
A process as claimed in claim 1 wherein the polymer which has cyclohex-2-enylene rings in the backbone thereof has a structure represented by general formula: ##STR3## wherein the cyclohexenylene ring and the residue X, where X is present, may vary from unit to unit along the polymer chain; each R 2 , which may be the same or different, is a hydrocarbyl group; X is the residue of one or more polymerisable comonomers; n is a whole number; m is 0 or a whole number; and the ratio of n:m lies in the range 1:0 to 1:100.
Claim 4
Dependent Claim
26 words
A process as claimed in claim 2 wherein the polymer which has cyclohex-2-enylene rings in the backbone thereof has a structure represented by general formula ##STR4##
Claim 5
Dependent Claim
20 words
A process as claimed in claim 3 wherein R 2 is an alkyl group having up to four carbon atoms.
Claim 6
Dependent Claim
15 words
A process as claimed in claim 1 wherein the organic amine is a tertiary amine.
Claim 7
Dependent Claim
25 words
A process as claimed in claim 1 wherein the amine has a boiling point at ambient pressure in the range 200° C. to 600° C.
Claim 8
Dependent Claim
17 words
A process as claimed in claim 1 carried out in the range 100° C. to 300° C.
Claim 9
Dependent Claim
23 words
A process as claimed in claim 1 wherein the concentration of amine in the reaction mixture is between 0.1 and 5 mole %.
Claim 10
Dependent Claim
21 words
A process as claimed in claim 1 wherein the polymeric composition is in the form of a film, coating or fibre.
Claim 11
Dependent Claim
15 words
A process as claimed in claim 1 wherein the polymeric composition comprises a polymeric blend.
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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |