group having 5 to 15 carbon atoms a cycloalkylidene group having 5 to 15 carbon atoms so 2 so o co or a group str2 r is a hydrogen atom a chlorine atom a bromine atom or a saturated alkyl group having 1 to 8 carbon atoms and m is a number of 0 to 4 the polycarbonate resin can be prepared by the solvent process that is by the ester exchange reaction of a dihydric phenol and a carbonate precursor such as phosgene or a dihydric phenol and a carbonate precursor such as diphenylcarbonate in a solvent such as methylene chloride in the presence of an acid acceptor and a molecular weight controlling agent dihydric phenols which are preferably used are bisphenols of these bisphenols 2 2 bis 4 hydroxyphenyl propane bisphenol a is particularly preferred this bisphenol a may be partially or wholly replaced with other dihydric phenol dihydric phenols other than bisphenol a include compounds such as hydroquinone 4 4 39 dihydroxydiphenyl bis 4 hydroxyphenyl alkane bis 4 hydroxyphenyl cycloalkane bis 4 hydroxyphenyl sulfide bis 4 hydroxyphenyl sulfone bis 4 hydroxyphenyl sulfoxide and bis 4 hydroxyphenyl ether and halogenated bisphenols such as bis 3 5 dibromo 4 hydroxyphenyl propane and bis 3 5 dichloro 4 hydroxyphenyl propane these dihydric phenols may be dihydric phenol homonopolymers or copolymers of two or more of the dihydric phenols or mixtures thereof the polycarbonate resin which is used in the present invention may be a thermoplastic random branched polycarbonate resin prepared by reacting a polyfunctional aromatic compound with a dihydric phenol and or carbonate precursor the viscosity average molecular weight of the polycarbonate resin is preferably 10 000 to 100 000 and especially preferably 20 000 to 40 000 from viewpoints of mechanical strength and moldability in the present invention.