Polycarbonate resin

摘要

A polycarbonate resin which is excellent in heat resistance, boiling water resistance and surface hardness and has a low water absorption coefficient. The polycarbonate resin comprises a unit (A) represented by the following formula and a unit (B) represented by the following formula as main recurring units, wherein the molar ratio (A/B) of the unit (A) to the unit (B) is 30/70 to 99/1.;
In the above formula, X is an alkylene group having 3 to 20 carbon atoms or cycloalkylene group having 3 to 20 carbon atoms, R is an alkyl group having 1 to 20 carbon atoms or cycloalkyl group having 3 to 20 carbon atoms, and “m” is an integer of 1 to 10.

主权项

1. A polycarbonate resin comprising a unit (A) represented by the following formula (A) and a unit (B) represented by the following formula (B) as main recurring units, wherein
a molar ratio (A/B) of the unit (A) to the unit (B) is 30/70 to 99/1,wherein in unit (B),
(i) —X{—(R)m}— is a 2-n-butyl-2-ethyl-1,3-propanediyl group 2,4-diethyl-1,5-pentanediyl group or a 3-methyl-1,5-pentanediyl group; or (ii) X is a cycloalkylene group having 3 to 20 carbon atoms and R is an alkyl group having 1 to 20 carbon atoms or a cycloalkyl group having 3 to 20 carbon atoms, and “m” is an integer of 1 to 10.