Melt-stable poly(arylene thioether-ketone) compositions

A melt-stable poly(arylene thioether-ketone) composition comprising:

• (A) 100 parts by weight of a melt-stable poly(arylene thioether-ketone) having predominant recurring units of the formula ##STR7## wherein the --CO-- and --S-- are in the para position to each other, and having the following physical properties (a)-(c):
• (a) melting point, Tm being 310-380.degree. C.;
• (b) residual melt crystallization enthalpy, .DELTA.Hmc (420.degree. C./10 min) being at least 10 J/g, and melt crystallization temperature, Tmc (420.degree. C./10 min) being at least 210.degree. C., wherein .DELTA.Hmc (420.degree. C./10 min) and Tmc (420.degree. C./10 min) are determined by a differential scanning calorimeter at a cooling rate of 10.degree. C./min after the poly(arylene thioether-ketone) is held at pv 50.degree. C. for 5 minutes in an inert gas atmosphere, heated to 420.degree. C. at a rate of 75.degree. C./min and then held for 10 minutes at 420.degree. C;
• (c) reduced viscosity being 0.2-2 dl/g as determined by viscosity measurement at 25.degree. C. and a polymer concentration of 0.5 g/dl in 98 percent by weight sulfuric acid;
• (B) 0-400 parts by weight of at least one thermoplastic resin;
• and
• (C) at least one filler selected from fibrous fillers and inorganic fillers in a proportion of 0-400 parts by weight per 100 parts by weight of the sum of said components (A) and (B);
• at least one of said components (B) and (C) being contained in a proportion of at least 0.1 part by weight per 100 parts by weight of said component (A).