Patent ID: 11952460
Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  G | IPC C  G

Claim 26:
27. A method for producing the polycarbonate resin of claim 1, including a step of performing melt polycondensation of a dihydroxy compound represented by general formula (5) and a carbonate diester,, (in formula (5), R1 and R2 independently represent a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, an alkyl group having a carbon number of 1 to 6, a mono- or polycyclic aryl group having a carbon number of 6 to 36, a mono- or polycyclic hetaryl having a total of 5 to 36 atoms, which are ring members, where 1, 2, 3 or 4 of these atoms are selected from nitrogen, sulfur and oxygen, while the remainder of these atoms are carbon atoms, an alkenyl group having a carbon number of 2 to 6, an alkoxy group having a carbon number of 1 to 6, or an aralkyl group having a carbon number of 7 to 17,
where mono- or polycyclic aryl and mono- or polycyclic hetaryl are unsubstituted or carry 1 or 2 radicals Ra, which are selected from the group consisting of CN, CH3, OCH3, O-phenyl, O-naphthyl, S-phenyl, S-naphthyl and halogen,
where R1 and R2 are not all a hydrogen atom;
X represents an alkylene group having a carbon number of 1 to 8, a cycloalkylene group having a carbon number of 5 to 12 or an arylene group having a carbon number of 6 to 20;
where alkylene group and cycloalkylene group are unsubstituted or carry a phenyl ring, and
a and b are each an integer of 1 to 10).