US3673162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyamides from bis(aminophenyl)sulfone
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1970-04-17
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Granted: 1972-06-27
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Expires: 1990-04-17
Abstract
Abstract The hydrolytic stability (and especially the resistance to immersion in boiling water) of polyamides of bis(aminophenyl)sulphones (or mixtures thereof with up to 20 mole percent of at least one other diamine) and Alpha , omega -polymethylene dicarboxylic acids having from six to 16 carbon atoms in all is improved by replacing from 3 to 36 mole percent of the dicarboxylic acid with a carbocyclic dicarboxylic acid. The products are useful as thermoplastic moulding materials and for conversion of films and fibers.
Inventors
- 👤 Alan Buckley
- 👤 Ieuan Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:38
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/42
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
15 words
A copolyamide as claimed in claim 1 in which the divalent carbocyclic group is meta-phenylene.
Claim 2
Dependent Claim
25 words
A copolyamide as claimed in claim 1 in which the chain extending valencies on the divalent carbocyclic group are all situated para to each other.
Claim 3
Dependent Claim
15 words
A copolyamide as claimed in claim 3 in which the divalent carbocyclic group is para-phenylene.
Claim 4
Dependent Claim
15 words
A copolyamide as claimed in claim 1 in which n is 4, 7 or 10.
Claim 5
Dependent Claim
23 words
A copolyamide as claimed in claim 1 in which Z is a divalent carbocyclic group in at least 10 percent of said units.
Claim 6
Dependent Claim
30 words
A copolyamide as claimed in claim 1 in which n is less than 8 and Z is a divalent carbocyclic group in not more than 25 percent of said units.
Claim 7
Dependent Claim
28 words
A copolyamide as claimed in claim 1 which is a copolymer of (i) adipic acid, azelaic acid or decane-1,10-dicarboxylic acid, (ii) isophthalic and/or terephthalic acid, and (iii) bis(4-aminophenyl)sulphone.
Claim 8
Dependent Claim
22 words
A copolyamide as claimed in claim 1 in which y is selected from the group consisting of divalent residues having the structure
Claim 9
Dependent Claim
26 words
A copolyamide as claimed in claim 1 in which the concentration of acid residues is less than 70 microequivalents of acid residues per gram of polymer.
Claim 10
Dependent Claim
11 words
A fiber or film of the copolyamide claimed in claim 1.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |