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:
Dec. 30, 1997
Filed:
May. 20, 1996
Applicant:
Inventors:
Andreas Gittinger, Krefeld, DE;
Claus Wulff, Krefeld, DE;
Heinrich Haupt, Krefeld, DE;
Karsten-Josef Idel, Krefeld, DE;
Assignee:
Bayer AG, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ; C08G / ;
U.S. Cl.
CPC ...
528486 ; 528310 ; 528323 ; 528481 ; 528499 ;
Abstract
The invention relates to a method for recycling (reprocessing) aqueous extract solutions obtained in the production of polyamides. The method for reprocessing the aqueous extract solutions obtained consists in that the aqueous extract solution is concentrated and polymerised, adding small amounts of dicarboxylic acid or polycarboxylic acid to the extract solution.