25711-481 The invention relates to a butadiene polymer composition containing a bisphenol compound represented by the following formula: wherein R5 represents alkyl group having 1 to 4 carbon atoms; R6 represents -C(CH3)2-R' (R' is alkyl group having 1 to 5 carbon atoms or phenyl group) or phenyl group; and R7 represents acrylate residue or methacrylate residue, in an amount of 0.05 to 2 parts by weight per 100 parts by weight of butadiene polymer. These compositions are quite stable to thermal deterioration and coloration in the absence of oxygen.
