POLYETHER POLYAMIDE ELASTOMER

摘要

Disclosed is a polyether polyamide elastomer particularly excellent in transparency while retaining properties such as dynamic physical properties, stiffness and resistance to fatigue from flexing. The polyether polyamide elastomer can be produced by polymerizing (A) a polyamide-forming monomer selected from (A1) an aminocarboxylic acid compound represented by the formula (1) and (A2) a lactam compound represented by the formula (2), (B) a diamine compound comprising (B1) a triblock polyether diamine compound represented by the formula (3) and (B2) at least one diamine compound selected from a branched saturated diamine having 6 to 22 carbon atoms, a branched alicyclic diamine having 6 to 16 carbon atoms and norbornanediamine, and (C) a dicarboxylic acid compound represented by the formula (4) with one another. H₂N-R¹-COOH (1) wherein R¹ represents a linking group having a hydrocarbon chain. (2) wherein R² represents a linking group having a hydrocarbon chain. (3) wherein x represents a number ranging from 1 to 20, y represents a number ranging from 4 to 50, and z represents a number ranging from 1 to 20. HOOC-(R³)_m-COOH (4) wherein R³ represents a linking group having a hydrocarbon chain, and m represents 0 or 1.