US3960819A
Expired / Lapsed
US
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Catalytic preparation of polyamides from bis(aminophenyl)sulphone
Assignee: Imperial Chemical Industries Ltd
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Filing: 1974-03-04
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Granted: 1976-06-01
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Expires: 1994-03-04
Abstract
Abstract Melt polycondensation of bis(aminophenyl)sulphone with dicarboxylic acid, especially aliphatic dicarboxylic acid, using as catalyst a specified Group VB compound, or metal salt or complex thereof. Typical catalysts are phosphinates or phosphonates in admixtures with metal salts.
Inventors
- 👤 Eileen Jones
- 👤 Arthur Morris
- 👤 Ieuan Thomas
- 👤 James Rodney Traynor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:09
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
A process for the production of a moldable or film- or fiber-forming polyamide in which at least one bis(aminophenyl)sulfone, or amide-forming derivative thereof, and at least one dicarboxylic acid, or amide-forming derivative thereof, in substantially equimolar proportions are heated together at 160° to 330°C under an inert atmosphere in the presence of a catalyst selected from the group consisting of at least one compound having the formula (RO) 2 R E=O and a product of mixing at least one compound having the formula (RO) 2 R E=O with at least one metal salt, said metal salt being a member of the group consisting of oxides, acetates, acetyl acetonates, halides and hydroxides of zinc, manganese, lanthanum, calcium, aluminum, magnesium, cobalt, cadmium, nickel, chromium, titanium, cerium, zirconium, thorium, and alkali metals, where R is selected from the group consisting of alkyl groups and phenyl groups and E is an element of Group VB of the periodic table of the elements having an atomic number greater than 7.
Claim 2
Dependent Claim
165 words
A process for the production of a moldable or film- or fiber-forming polyamide in which at least one bis(aminophenyl)sulfone, or amide-forming derivative thereof, and at least one dicarboxylic acid, or amide-forming derivative thereof, in substantially equimolar proportions are heated together at 160° to 330°C under an inert atmosphere in the presence of a catalyst selected from the group consisting of at least one compound having the formula (RO) 2 R E=O and a product of mixing at least one compound having the formula (RO) 2 R E=O with at least one metal salt, said metal salt being a member of the group consisting of oxides, acetates, acetyl acetonates, halides and hydroxides of zinc, manganese, lanthanum, calcium, aluminum, magnesium, cobalt, cadmium, nickel, chromium, titanium, cerium, zirconium, thorium, and alkali metals, where R is selected from the group consisting of alkyl groups and phenyl groups and E is an element of Group VB of the periodic table of the elements having an atomic number greater than 7.
Claim 3
Dependent Claim
32 words
A process according to claim 1 in which the bis(aminophenyl) sulphone is the 4,4'-isomer and in which the dicarboxylic acid is a linear α,ω-dicarboxylic acid having from 6 to 16 carbon atoms.
Claim 4
Dependent Claim
40 words
A process according to claim 1 in which from 10 to 25 mole % of the dicarboxylic acid is a carbocyclic diacid, the remainder being a linear aliphatic α,ω -dicarboxylic acid having from 6 to 16 carbon atoms in all.
Claim 5
Dependent Claim
33 words
A process according to claim 1 in which the catalyst used in an admixture of a potassium salt and a dialkyl alkylphosphonate containing from 1 to 4 carbon atoms in each alkyl group.
References Cited (Backward Citations)
US3671498A
Cited
US3673162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |