Wholly aromatic polyesters with reduced char content
US4952663A · kind A · utility
3Cited by
7References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1988 |
| Grant date | Aug 28, 1990 |
| Priority date | — |
| Expiry date | Jun 17, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/605
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to the preparation of wholly aromatic polyesters from monomers having a total ash content of no more than 50 ppm and a total potassium content of no more than 20 ppm. These polyesters have good color and good thermal stability and are essentially free of char material which can lead to unacceptable molded and extruded articles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.