Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1986-02-13
1987-08-25
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
525420, 528279, 528288, 528301, C08L 6700, C08L 7700
Patent
active
046893938
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.
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Anderson Harold D.
Bierman Jordan B.
Ems-Inventa A.G.
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