39 dihydroxydiphenyl sulfone 5 chloro 2 4 39 dihydroxydiphenyl sulfone bis 4 hydroxyphenyl diphenyldisulfone bis 4 hydroxyphenyl sulfide 4 4 39 dihydroxydiphenylether 4 4 39 dihydroxy 3 3 39 dichlorodiphenylether 4 4 39 dihydroxy 2 5 diethoxydiphenylether etc these dihydroxyaryl compounds can be used independently or in combination with each other as a copolymer if necessary the diester carbonate used in the present invention is a compound of the following general formula 2 str2 in which ar 1 and ar 2 each represent a monovalent aliphatic or a monovalent aryl group and ar 1 and ar 2 may be the same or different the diester carbonate represented by formula 2 is for example substituted diphenyl carbonate dimethyl carbonate ditolyl carbonate di t butyl carbonate preferably diphenyl carbonate or substituted diphenyl carbonate these diester carbonates can be used independently or in combination with each other in the reaction of the present invention generally a catalyst can be used the catalyst used in the present invention is not limited and can be a conventional catalyst used in a transesterification reaction these catalysts can be used independently or in combination with each other these catalyst are for example an alkali metal compound or the salts thereof an alkaline earth metal compound or the salts thereof an organic basic compound a metal alkoxide and another organic metal compound an alkali metal compound or the salts thereof is inexpensive and preferably used hereinafter the present invention is explained in more detail but these examples should not be construed as limiting the scope and spirit of the invention using a ubelode viscometer the intrinsic viscosity u03b7.