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:
May. 08, 2001
Filed:
Oct. 20, 1999
Applicant:
Inventors:
Jacobus A. Loontjens, Meerssen, NL;
Bartholomeus J. M. Plum, Meerssen, NL;
Assignee:
DSM N.V., Heerlen, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 6/914 ; C08G 6/916 ; C08F 8/00 ;
U.S. Cl.
CPC ...
C08G 6/914 ; C08G 6/916 ; C08F 8/00 ;
Abstract
The invention relates to a process for preparing a high-molecular polyamide or polyester by melt-mixing polyamide or polyester having a lower molecular weight with a carbonyl bislactam having formula 1, in which n=an integer of between 3 and 15. With the process according to the invention a permanent increase in the molecular weight of a polyamide is obtained within 2 minutes, whereas this takes at least 10 minutes under comparable conditions using a bislactam according to the state of the art.