Process for the production of high molecular weight polyester resins
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 27, 1994
Grant Date -
N/A
app pub date -
Jun 11, 1993
filing date -
Oct 18, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A process for the production of polyester resins having an intrinsic viscosity higher than 0.57 dl/g from polyester resins having intrinsic viscosities of lower than 0.57 dl/g in which 1) a melt of the polyester resin having an intrinsic viscosity lower than 0.57 dl/g is mixed with a polyaddition additive containing at least two groups which react with the terminal OH and COOH groups of the resin, 2) the melted mixture is converted into solid particles which are subsequently crystallized at temperatures higher than the Tg of the polyester resin and lower than its melting point, and 3) the particles are heated at temperatures higher than 150.degree. C. but lower than the melting point of the resin to increase the intrinsic viscosity.
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