Method for the preparation of multiply-branched aromatic polyesters
US5196502A · kind A · utility
24Cited by
8References
18Claims
0Family size
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Inventors
Key dates
| Filing date | Nov 5, 1991 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Nov 5, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S424/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An improved method for producing multiply-branched polyester comprising condensing a reactant having the general formula Z.sup.1 --Ar--(Z.sup.2).sub.j, wherein j is 2 or 3, Ar is an aryl or heteroaryl group having from 1 to 3, solitary or linked or fused, five or six membered rings, and one of Z.sup.1 and Z.sup.2 is a carboxyl group and the other is a group having the general formula ##STR1## wherein R is an alkyl group having from 1 to 3 carbon atoms, X is selected from the group consisting of fluoro and chloro and g is an integer from 0 to about 7.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.