Process for producing polyester articles having low acetaldehyde content
US5648032A · kind A · utility
51Cited by
33References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1995 |
| Grant date | Jul 15, 1997 |
| Priority date | — |
| Expiry date | Aug 1, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/0002
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a process for producing molded polyester articles having a low acetaldehyde content by PA1 a) reacting a glycol and a dicarboxylic acid in the melt phase to form a polyester having an I.V. of about 0.65-0.85, PA1 b) solidifying and pelletizing said polyester, PA1 c) remelting said polyester in an extruder, and, PA1 d) forming said polyester into shaped articles, wherein the polyester is devolatilized during or following said polymerization in the melt, while it is being remelted, after remelting, or any combination by passing a purge gas over said molten polyester.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.