Process for producing polyester resins
US7183362B2 · kind B2 · utility
24Cited by
0References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2004 |
| Grant date | Feb 27, 2007 |
| Priority date | — |
| Expiry date | Nov 29, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/85
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
In the invention, a polyester resin comprising dicarboxylic acid constitutional units and diol constitutional units wherein 5 to 60 mol % of the diol constitutional units has a cyclic acetal skeleton is produced by a process comprising an oligomerization step and a polymerization step. In the oligomerization step, an ester having a limited acid value is transesterified with a diol having a cyclic acetal skeleton in the presence of a basic compound to obtain an oligomer. The oligomer is then polymerized in the subsequent polymerization step to increase the molecular weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.