Polyesters prepared from alkoxylated intermediates
US5998568A · kind A · utility
3Cited by
56References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1999 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Jan 14, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/42
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for making a polyester resin comprises reacting a first polyfunctional alcohol or polyfunctional thiol and a carbonate in the presence of a catalyst to form an alkoxylated intermediate. The catalyst comprises: (1) a metal, a salt of a metal, or mixtures thereof and (2) a quaternary ammonium salt, a tertiary amine, an imidazole, or mixtures thereof. The alkoxylated intermediate is then reacted with a polyfunctional organic acid or anhydride thereof to form the polyester resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.