Process for producing polyester resin
US3951886A · kind A · utility
47Cited by
2References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1974 |
| Grant date | Apr 20, 1976 |
| Priority date | — |
| Expiry date | Mar 22, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for producing polyester resins, such as saturated polyester resin, alkyd resin and unsaturated polyester resin from polyester wastes, which comprises depolycondensing polyester wastes with at least one polyol in the presence of at least one titanyl oxalate compound and/or titanium tartrate compound and subsequently polycondensing the resulting depolycondensation product with at least one polycarboxylic acid or its anhydride or with at least one polycarboxylic acid or its anhydride and at least one polyol, optionally in the presence of at least one phosphorus compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.