Hydrolysis stable block polyetheresteramides and process for their manufacture
AssigneeInventa AG fur Forschung und Patentverwertung
InventorHanns-Jorg Liedloff
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Abstract
Hydrolysis-stable, thermoplastic block polyetheresteramides are produced by a catalyzed polycondensation of linear, aliphatic polyamides having carboxyl end groups with .alpha.,.omega.-dihydroxypolyethers and additionally, a linear or branched, aliphatic or cycloaliphatic diol having 2-8 carbon atoms in an amount of 3-30 mol %, relative to the sum of the moles of both other starting materials. The ratio of the moles of the polyamide components to the sum of the moles of the dihydroxypolyether and diol components is 0.81 to 0.985.
Claims8
A process for the manufacture of hydrolysis-stable thermoplastic block polyetheresteramide comprising polycondensing
- (a) at least one linear, aliphatic polyamide having carboxyl end groups and a molecular weight of from 700 to 15,000,
- (b) at least one .alpha.,.omega.-dihydroxypolyether having a molecular weight of from 400 to 4,000 and
- (c) at least one diol selected from linear or branched, aliphatic or cycloaliphatic diols having 2-8 carbon atoms which diol is present in an amount of 3-30 mole %, relative to the total of said components (a) and (b),
- in the presence of an esterification catalyst at a pressure ranging from high vacuum to atmospheric pressure at temperatures of 210.degree.-280.degree. C., and ##EQU3## wherein M.sub.a, M.sub.b and M.sub.c are the number of moles of said components (a), (b), and (c) in said polyetheresteramide, respectively.
A block polyetheresteramide comprising the reaction product of
- (a) linear, aliphatic polyamide having carboxyl end groups and a molecular weight of from 700 to 15,000 in a molar amount M.sub.a,
- (b) .alpha.,.omega.-dihydroxypolyethers having a molecular weight from 400 to 4,000 in a molar amount M.sub.b, and
- (c) diols selected from linear or branched, aliphatic and cycloaliphatic diols having 2-8 carbon atoms in a molar amount M.sub.c, wherein M.sub.c is 3-30% of M.sub.a +M.sub.b and ##EQU4##
Dependencies are inferred from the claim text.