Polycarbonate blends

Copolycarbonate blends containing 4,4'-dihydroxydiphenyl or substituted 4,4'-dihydroxydiphenyl and polycarbonate from pure bisphenol-A can be prepared which at small levels of 4,4'-dihydroxydiphenyl or substituted 4,4'-dihydroxydiphenyl on the total amount of end product retain the desired properties of copolycarbonates (A) without alteration. Polycarbonate blend comprises (wt.%): copolycarbonate (A)(1-99) from compounds of formula (I): (0.1-48), complimentary amounts of compounds of formula as bisphenol-A monomer (II), and pure bisphenol-A polycarbonate (B): R1 to R6 = H, 1-4C alkyl, optionally substituted phenyl, halogen; R5 to R8 = H, Me, Cl or Br; and X = 1-5C alkylene-alkylidene, 5-6C cycloalkylene, 5-10C cycloalkylidene, An Independent claim is included for a shaped body and extrudate from the polycarbonate blends.