The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 2001
Filed:
Oct. 19, 2000
Applicant:
Inventors:
Karin Regel, Hueckelhoven, DE;
Roland Andernach, Lampertheim, DE;
Peter Schwarz, Aachen, DE;
Heinz Herbst, Lörrach, DE;
Kurt Hoffmann, Weitenau-Steinen, DE;
Rudolf Pfaendner, Rimbach, DE;
Dirk Simon, Mutterstadt, DE;
Assignee:
Ciba Specialty Chemicals Corporation, Tarrytown, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F 6/00 ; C08K 5/5333 ;
U.S. Cl.
CPC ...
C08F 6/00 ; C08K 5/5333 ;
Abstract
This invention relates to a process for increasing the molecular weight of polyesters, copolyesters or polyester blends by adding an organic phosphate to the processing apparatus and fusing the mixture to above the melting point, in which process the processing apparatus is a single-screw extruder, twin-screw extruder, planetary-gear extruder, ring extruder or co-kneader having at least one vent zone to which underpressure is applied.