| abstract |
PURPOSE: To provide dihydroxydiphenyl bicycloalkane useful for production of a high-mol.wt. thermoplastic polycarbonate resin having desirable characteristics and contg. a specific range of cyclic carbon atoms in a bicycloalkane. n CONSTITUTION: The compd. is expressed by formula I (R 1 , R 2 are each H, halogen, 1-8C alkyl, 5-6C cycloalkyl, 6-10C aryl, 7-12C aralkyl; (m) is 3 to 7; R 3 , R 4 are H, 1-6C alkyl, 6-10C aryl, aralkyl and are selected for respectively separate X; X is carbon, both of R 3 and R 4 attached to at least one of X are not H); for example, the compd. of formula II. The compd. is obtd. by bringing the phenol of formula II and the ketone of formula IV into reaction under a pressure of 1 to 20 bar and at -30 to 300°C in the presence of an acidic catalyst. The compd. of the formula I and a carbonate precursor are brought into reaction to obtain the thermoplastic arom. polycarbonate which contains the bifunctional polycarbonate constitutional unit of formula V and having at a weight average mol.wt. of at least 9,000. n COPYRIGHT: (C)1992,JPO |