Method for producing a crystallized aromatic polycarbonate,...

Details Method for producing a crystallized aromatic polycarbonate,... Method for producing a crystallized aromatic polycarbonate,...

C - Chemistry, Metallurgy

08

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402/178

C08G 64/04 (2006.01) C08G 64/20 (2006.01) C08G 64/30 (2006.01) C08G 64/40 (2006.01)

Patent

CA 1305579

ABSTRACT OF THE DISCLOSURE A crystallized aromatic polycarbonate having a weight average molecular weight of from 6,000 to 200,000 and having a terminal hydroxyl group content of not greater than 0.03 % by weight based on the weight of the polycarbonate is effectively produced by first heating a mixture of a dihydroxydiaryl compound comprising at least 85 mole % of a dihydroxydiaryl alkane with a diaryl carbonate to prepare a prepolymer having a weight average molec- ular weight of from 2,000 to 20,000 and having terminal aryl carbonate groups in an amount of greater than 50 mole %, based on the total number of moles of all the terminal groups of the prepolymer, secondly crystallizing the prepolymer and finally subjecting the crystallized prepolymer to solid- state polymerization. The crystallized aromatic polycarbonate does not contain impurities, is color- less and has excellent properties such as resistance to heat and to boiling water. Therefore, the poly- carbonate is advantageously used as engineering plastics.

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