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. 06, 2002
Filed:
May. 11, 2000
Applicant:
Inventors:
Hans-Harald Hünger, Ellerstadt, DE;
Alfons Ludwig, Höxter, DE;
Rainer Neuberg, Dannstadt-Schauernheim, DE;
Gunter Pipper, Bad Dürkheim, DE;
Thomas Sauer, Dirmstein, DE;
Axel Wilms, Weisenheim, DE;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 6/904 ; C08G 6/916 ; C08G 6/946 ;
U.S. Cl.
CPC ...
C08G 6/904 ; C08G 6/916 ; C08G 6/946 ;
Abstract
The disclosure is a process for preparing polyamides by concentrating the wash water extract from the extraction of polyamide to an extractables content of not more than 85% by weight, adding fresh lactam down to a water content of from 0.5 to 13% by weight, and effecting at least one adiabatic expansion during the polymerization.