Patent ID: 6222004
Filing Date: 2001-04-24
Classification: C08G

Abstract:
An uncrossed-linked branched polycarbonate resin prepared from a phenol component containing a tetrahydric phenol having formula (I) below, which serves as a branching agent in the formation of the polycarbonate structure, which branching agent content ranges from 0.01 to 0.4 mol. % as determined by the ratio of the molar amount of branching agent to the total molar amount of dihydric phenol, chain terminator and branching agent in the reaction mixture from which the polycarbonate is prepared and having an intrinsic viscosity [.lambda.] ranging from 0.5 to 0.6, ##STR5##wherein A, R.sup.1, R.sup.2 and p are as follows:A represents a polymethylene group having from 7 to 20 carbon atoms, an alkylene or alkylidene group having from 2 to 20 carbon atoms but excluding polymethylene groups having from 1 to 6 carbon atoms, a cycloalkylene or cycloalkylidene group having from 5 to 20 carbon atoms, an arylene or alkylarylene group having from 6 to 20 carbon atoms, an arylalkylene group having from 6 to 20 carbon atoms, --O--, --CO--, --S--, --SO--, or --SO.sub.2 --;R.sup.1 represents a hydrogen atom, an alkyl group having from 1 to 8 carbon atoms, an aryl group having from 6 to 20 carbon atoms, or an arylalkyl group having from 7 to 20 carbon atoms, and R.sup.1 's may be the same or different;R.sup.2 represents a halogen atom, an alkyl group having from 1 to 8 carbon atoms, an aryl group having from 6 to 20 carbon atoms, or an arylalkyl group having from 7 to 20 carbon atoms, and plural R.sup.2 's, if any, may be the same or different;p is 0 or an integer ranging from 1 to 4;or A, R.sup.1, R.sup.2 and p are as follows:A represents a single bond, a polymethylene group having from 1 to 20 carbon atoms, an alkylene or alkylidene group having from 2 to 20 carbon atoms, a cycloalkylene or cycloalkylidene group having from 5 to 20 carbon atoms, an arylene or alkylarylene group having from 6 to 20 carbon atoms, an arylalkylene group having from 6 to 20 carbon atoms, --O--, --CO--, --S--, --SO--, or --SO.sub.2 --;R.sup.1 represents an alkyl group having from 7 to 20 carbon atoms, an aryl or alkylaryl group having from 6 to 20 carbon atoms, or an arylalkyl group having from 7 to 20 carbon atoms, and R.sup.1 's may be the same or different;R.sup.2 represents a halogen atom, an alkyl group having from 1 to 8 carbon atoms, an aryl group having from 6 to 20 carbon atoms, or an arylalkyl group having from 7 to 20 carbon atoms, and plural R.sup.2 's, if any, may be the same or different;p is 0 or an integer ranging from 1 to 4.