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. 09, 1985
Filed:
Jan. 17, 1984
Hansdieter Hofmann, Karben, DE;
Hans-Jochen Rothe, Maintal, DE;
Georg Skupin, Bruchkobel, DE;
Konrad Wolff, Frankfurt am Main, DE;
Davy McKee, , DE;
Abstract
Production of spinnable polyhexamethylene adipamide of high molecular weight from adiponitrile, hexamethylene diamine, water and additives, preferably continuously in a reaction cascade and in a finisher as the final stage, catalytically accelerated by catalysts as disclosed. The polyamides can be produced from dinitriles, diamines and excess water in the presence of catalysts selected from the group consisting of: alkyl, aryl and alkyl/aryl esters of phosphoric, phosphorous, phosphonic and phosphinic acids. The catalyst is present in the amount of 0.001 to 1.0% based upon the total weight of the reactants.