| abstract |
Disclosed is a polyether polyamide elastomer particularly excellent in transparency while retaining properties such as dynamic physical properties, stiffness and bending-fatigue resistance. The polyether polyamide elastomer is produced by polymerizing (A) a polyamide-forming monomer selected from an aminocarboxylic acid compound (A1) represented by the following formula (1) and a lactam compound (A2) represented by the following formula (2), (B) a diamine compound comprising a triblock polyetherdiamine compound (B1) represented by the following formula (3) and at least one diamine compound (B2) 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 following formula (4), n H 2 N—R 1 —COOH (1) wherein R 1 represents a linking group having a hydrocarbon chain, n n n n n n n n n n n n wherein R 2 represents a linking group having a hydrocarbon chain, n n n n n n n n n n n n n n n n wherein x represents a number from 1 to 20, y represents a number from 4 to 50, and z represents a number from 1 to 20, n n n n n HOOC—(R 3 ) m —COOH (4) wherein R 3 represents a linking group having a hydrocarbon chain, and m represents 0 or 1. |