Process for the production of polyester resins
US6228302A · kind A · utility
11Cited by
17References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 23, 1997 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Jul 23, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/88
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Process for the crystallization of aromatic polyester resins having IV between 0,5 and 0.7 dl/g wherein the resin is extruded in the form of a strand at extruder exit or the chips obtained by cutting the strand are crystallized maintaining them at temperature between 160.degree. C. and 220.degree. C. for sufficient time to obtain a crystallized product wherein the DSC curves do not show the presence of practically any premelt peaks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.