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. 19, 1988
Filed:
Nov. 17, 1986
Applicant:
Inventors:
Walter Heitz, Kirchhain, DE;
Reinhold Schwalm, Wachenheim, DE;
Assignee:
Bayer AG, Leverkusen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ; C09K / ; C07D / ;
U.S. Cl.
CPC ...
528369 ; 528372 ; 544387 ; 544360 ; 544357 ; 25218228 ;
Abstract
A process for preparing oligomers and telechels of poly(carboxy-piperazine) and new oligomers the telechels of poly(carboxy-piperazine), wherein the process involves condensation of piperazine or piperazine-N-carboxylic acid esters or their reaction with piperazine or piperidine derivatives to form an intermediate which is reacted with diphenyl carbonate in the presence of a tertiary amine.