Preparation of polyarylenesulfone from bis(chloroaryl) sulfone, dihydric phenol and difluorodiphenylsulfone
US5239044A · kind A · utility
2Cited by
3References
10Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 13, 1992 |
| Grant date | Aug 24, 1993 |
| Priority date | — |
| Expiry date | Oct 13, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G75/23
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polyarylsulphone is prepared by the polycondensation of a bisphenol with an aryl dichloride, at least one of which contains a sulphone group, in the presence of a base and introducing into the reaction mixture less than 5% mole, relative to the aryl dichloride, of 4,4'-difluorodiphenylsulphone. The bisphenol and aryldichloride can be of 4,4'-dihydroxydiphenylsulphone and 4,4'-dichlorodiphenylsulphone respectively. The difluoro compound is added when the polymerisation is essentially complete. The polymer product if of improved quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.