Melt-anisotropic wholly aromatic polyester and fibers or films thereof
US4447593A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1982 |
| Grant date | May 8, 1984 |
| Priority date | — |
| Expiry date | Aug 17, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2367/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A fiber- or film-forming wholly aromatic polyester having melt anisotropy, said polyester consisting essentially of PA0 (1) units (a) derived from an aromatic dicarboxylic acid at least 90 mole % of which consists of a p-oriented aromatic dicarboxylic acid and units (b) derived from an aromatic dihydroxy compound at least about 90 mole % of which consists of a mono-substituted hydroquinone ring-substituted by an alkyl group having at least 5 carbon atoms or an aralkyl group having at least 7 carbon atoms or a mixture of said mono-substituted hydroquinone and unsubstituted hydroquinone or a substituted hydroquinone other than said mono-substituted hydroquinone, the proportion of said mono-substituted hydroquinone being at least 80 mole %; or PA0 (2) said units (a) and (b), and units (c) derived from a p-oriented aromatic hydroxycarboxylic acid at least about 70 mole % of which consists of p-hydroxybenzoic acid and/or a mono-substituted p-hydroxybenzoic acid, the proportion of the units derived from the p-oriented aromatic dicarboxylic acid and the units derived from the mono-substituted hydroquinone being at least about 9 mole % based on the entire structural units of the polyester;…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.