Process for the production of polyester resins
US5902864A · kind A · utility
5Cited by
4References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 15, 1997 |
| Grant date | May 11, 1999 |
| Priority date | — |
| Expiry date | Jul 15, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/80
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Process for the production of aromatic polyester resins starting from resins with an IV from 0.1 to 0.4 dl/g comprising the steps of blending the resin with a dianhydride of a tetracarboxylic acid, extruding the resin under the form of a strand, cooling the strand or the chips obtainable by cutting the strand, at a temperature between 150.degree. C. and 210.degree. C. and maintaining the same temperature for sufficient time to obtain a crystalline product wherein the DSC curves of the same do not show presence of premelt peaks or only in a negligible amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.