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. 02, 2022
Filed:
Jul. 25, 2017
Arkema France, Colombes, FR;
Jean-Luc Dubois, Millery, FR;
ARKEMA FRANCE, Colombes, FR;
Abstract
A process for synthesizing polyamide PA 6-6, including a first step of reacting, in the presence of water, a compound of RCOO—(CH)—COOR'in which Rand R′, which may be identical or different, represent H or a linear or branched alkyl radical comprising from 1 to 4 carbon atoms, with hexamethylenediamine (HMDA), at a temperature of less than or equal to 160° C., to form a reaction medium, and then a second step of heating the reaction medium to a temperature of greater than or equal to 200° C.; the reaction medium also including a compound of R—COO—(CH)—CH═CH—(CH)—COO—Rand/or a compound of R—(CH)—CH═CH—(CH)—COO—R.