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. 25, 1987
Filed:
Feb. 13, 1986
Hanns-Jorg Liedloff, Domat-Ems, CH;
EMS-Inventa A.G., Zurich, CH;
Abstract
A process for the manufacture of thermoplastic block polyetheresteramides by polycondensation of linear polyamides having carboxyl end groups with approximately equimolar quantitites of .alpha.,107 -dihydroxypolyethers in the presence of organic or inorganic stannous compounds as esterification catalysts. Preferred polyamide-forming materials include the monomers of PA-6, PA-11, PA-12, PA-6.6, PA-6.9, PA-6.10, PA-6.12, PA-6.13, or mixtures thereof and linear and branched aliphatic, aromatic, and cycloaliphatic dicarboxylic acids. The molecular weight of the polyamides used is 700-15,000, and that of the dihydroxypolyethers is 400-4,000. Polycondensation takes place at atmospheric or reduced pressure and at temperatures of 210.degree.-280.degree. C.