Polyamide-hydrogenated polybutadiene-acrylonitrile copolymers

A polyamide-hydrogenated polybutadiene-acrylonitrile block copolymer formed by polycondensation between a polyamide having aminoaryl groups at both its terminals and having a phenolic hydroxyl group, and a hydrogenated polybutadiene-acrylonitrile copolymer having carboxyl groups at both its terminals, the copolymer being characterized by comprising block units (A) represented by the following formula (I) and block units (B) represented by the following formula (III):

• ##STR14## wherein Bu is a hydrogenated butadiene radical, R is a divalent organic radical, R' is a divalent aromatic group having a hydroxyl group, Ar is a divalent aromatic group represented by the following formulae (1)-(6):
• ##STR15## each of k and z is an average polymerization degree, where k is an integer of 2-400, and z is an integer of 5-100, m and n are molar fractions in the copolycondensation, where m.gtoreq.0.04, and m+n=1, and x and y are molar fractions in the polymerization, where x:y=0.95:0.05 to 0.6:0.4, and x+y=1,
• and block units (A) and (B) are contained in the range of 2 to 20 respectively.