Method and device for increasing the intrinsic viscosity of polyester material by means of solid phase polymerisation
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 15, 2008
Issued Date -
N/A
app pub date -
Sep 25, 2003
filing date -
Sep 25, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention relates to a process and a device for increasing the intrinsic viscosity of a polyester material by solid-state polymerization, wherein the polyester material is heat-treated in a heat treatment container (6), the polyester material being introduced into a preheating container (2) prior to being conveyed into the heat treatment container (6), in which preheating container it is heated to a heat treatment temperature of the heat treatment container (6) or to a temperature above that and is delivered to the heat treatment container (6) after having reached said temperature. The preheating container (2) is small in comparison with the heat treatment container (6) so that the relatively small amount of polyester material contained therein can quickly be heated to the intended temperature, thereby leading to a short residence time in the preheating container. After reaching the intended temperature, the entire content of the preheating container can be delivered all at once to the heat treatment container, whereupon the preheating container can be charged with fresh polyester material. Due to the short residence time, the preheating container is operable well in a discontinuous operation.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully