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. 16, 1977
Filed:
Nov. 17, 1975
Zbynek Bukac, Prague, CS;
Jan Sebenda, Prague, CS;
Ceskoslovenska akademie ved, Prague, CS;
Abstract
Preparation of polyamides by anionic polymerization or copolymerization of cyclic lactams which comprises conducting the polymerization in the presence of a six membered cyclic co-catalyst containing three ##STR1## groups and represented by the formula: ##STR2## wherein R.sub.1 and R.sub.2 are each selected from the group consisting of aryl groups, or containing two ##STR3## groups and represented by the formula: ##STR4## wherein R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are each selected from the group consisting of alkyl (C 1-18) and aryl groups and combinations thereof, and X.sub.1, X.sub.2 and X.sub.3 are either sulphur or oxygen, except that at least two members of the group X.sub.1, X.sub.2 and X.sub.3 must be oxygen. Preferably, the aryl contains from 1 to 3 benzene rings, or can be an alkoxyaryl or dialkylaminoaryl. The alkyl can be an arylated alkyl.