Pitch (softening p., 68.5 degrees C, penetration 830 im at 50 degrees C, toluene-insols. 20.4, volatiles 62.1%) was blended (> 300 degrees C) with PVC, PS, atactic PP styrene-butadiene copolymer, coumarone-indene resin (CIR), unsaturated polyester resin (UP), poly(oxyethylene)diol (PEG), or poly(ethylene terephthalate) and carbonized 2 hrs., 520 degrees C, heat rate 5 degrees C/min, in Ar passed at 5 I./hr. Anisotropic and optical texture percentages in the carbonizates were detd. by microscopy, and thermal transformations by TG, DTA and DTG. The 10% polymer blends prepd. at individual temps., 100-350 degrees C, gave stable and uniform compositions, except for PS and PVC which reacted with the pitch. If not carbonized, the blends were two-phase structures resembling non-modified pitch. The PET-pitch revealed extensive micellar domains. With CIR, PET, or APP semicoke yields were greater Transformation of the isotropic into the mesophase followed the descending type: PS > PEG > PET > PVC > CIR > APP > UP.