Oxygen desorption for improved color of polyesters
US4661580A · kind A · utility
4Cited by
1References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 1, 1986 |
| Grant date | Apr 28, 1987 |
| Priority date | — |
| Expiry date | Apr 1, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/78
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for forming polyesters with reduced yellow coloration wherein the polyester-forming monomers are dried in a vacuum before being reacted. The reaction system itself contains a substantially deoxygenated atmosphere. The removal of oxygen from the reactants and the reaction system leads to the lessening of yellow coloration of the polyester product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.