Thermoplastic resin composition

A thermoplastic resin composition which comprises a blend obtainable by blending 0.1 to 99% by weight of (a) a fluorine-containing polymer having a functional group and a number-average molecular weight of 2000 to 1000000 and 1 to 99.9% by weight of (b) a heat resisting thermoplastic resin having a crystalline melting point or glass transition temperature of not less than 150° C.;

• said fluorine-containing polymer (a) having the functional group is at least one selected from fluorine-containing polymers having functional groups, in which a concentration of the functional groups at a main chain end portion and side chain portion is 2 to 2000 μmol/g per the total weight of the fluorine-containing polymer, and represented by the formula [I],
• A[Parenopenst]X[Parenclosest][Parenopenst]Y[Parenclosest]A2 [I]
• wherein X is a structural unit of the formula [Parenopenst]CH2CX1X2[Parenclosest] (wherein X1 and X2 are the same or different, and each is hydrogen atom, fluorine atom, [Parenopenst]CH2[Parenclosest]p[Parenopenst]O[Parenclosest]qR—B1 (R is a dihydric hydrocarbon group having carbon atoms of 1 to 20 or dihydric fluorine-substituted organic group having carbon atoms of 1 to 20, B1 is hydrogen atom, fluorine atom, hydroxy group or epoxy group, p is 0 or 1 and q is 0 or 1), —OCO—R—B1 (R and B1 are the same as above) or —COO—R—B1 (R and B1 are the same as above));
• Y is a structural unit of the formula [Parenopenst]CF2CY1Y2[Parenclosest] (wherein Y1 and Y2 are the same or different, and each is hydrogen atom, fluorine atom, chlorine atom, [Parenopenst]CF2[Parenclosest]r[Parenopenst]O[Parenclosest]s[Parenopenst]Rf[Parenclosest]t[Parenopenst]CH2[Parenclosest]uB2 (Rf is a dihydric fluorine-substituted organic group having carbon atoms of 1 to 14, B2 is hydrogen atom, halogen atom, hydroxy group, epoxy group or glycidyloxy group, r is 0 or 1, s is 0 or 1, t is 0 or 1, and u is an integer of 1 to 3) or [Parenopenst]CF2[Parenclosest]vB3 (B3 is hydrogen atom, fluorine atom or chlorine atom, v is an integer of 1 to 10));
• both A1 and A2 are end portions of a main chain;
• provided that each of X and Y may comprise two or more structural units;
• Y may not be present when X has the structural unit derived from CH2═CHF, CH2═CF2 or fluoroalkyl-α-substituted acrylate (substituent is hydrogen atom, fluorine atom or methyl);
• X may not be present when Y has the structural unit derived from CF2═CF2 or CF2═CHC1;
• at least one of A1 and A2 contains hydroxy group, epoxy group or glycidyl group when both of X and Y do not contain hydroxy group, epoxy group or glycidyl group.