PURPOSE:To obtain a high polymer composition, capable of forming a stabilized fine dispersion system and having excellent heat resistance, breaking strength, modulus of elasticity and flexural strength, by blending an N-substituted p- oriented wholly aromatic polyamide with a flexible high polymer. CONSTITUTION:A composition consisting of (A) one or more N-substituted wholly aromatic polyamides, consisting of recurring units expressed by formulas I and/or II (X, Y and Z are H and/or group expressed by formula III, H and/or group expressed by formula IV, H and/or group expressed by formula V or H and/or group expressed by formula VI; Ar1-Ar3 are bifunctional p-oriented aromatic groups and preferably p-phenylene group; k is 7-25; l is 1-6; n is 1-10 and m is an optional integer; Ar4 is aromatic group expressed by formula VII, etc.; R1-R4 are H, CH3, etc.; M is H or Li, Na, K, Rb or Cs) and having =2mol.% substitution ratio (N-substitution ratio or graft ratio) and =0.1 inherent viscosity and (B) flexible high polymer.
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