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:
Aug. 03, 2010
Filed:
Jan. 07, 2003
Applicants:
Robert C. B. Crombach, Kerkrade, NL;
Rudy Rulkens, Cadier en Keer, NL;
Inventors:
Robert C. B. Crombach, Kerkrade, NL;
Rudy Rulkens, Cadier en Keer, NL;
Assignee:
DSM IP Assets B.V., Heerlen, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G 69/28 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to a process for increasing the molecular weight of a polyamide via solid-state post-condensation by exposing the polyamide in the solid-state at elevated temperature to an inert gas atmosphere, that comprises a step (a) wherein the gas atmosphere to which the polyamide is exposed has a dew temperature T, followed by a step (b) wherein the gas atmosphere to which the polyamide is exposed has a dew temperature T, whereby Tis higher than T. The effect is that a high molecular weight polyamide can be obtained in a shorter production time.