Polycarbonate copolymer
AssigneeIdemitsu Petrochemical Co., Ltd.
InventorMitsugu Nakae
Life of this patent
Estimating the term…
Abstract
A polycarbonate copolymer having a desirable heat resistance and impact resistance, which comprises a carbonate structural unit of the formula (I): ##STR1## wherein A is alkylidene, alkylene, arylene, arylalkylene, --O--, --S--, --SO.sub.2 -- or a single bond, and a carbonate structural unit of formula (II): ##STR2## wherein X.sup.1 and Y.sup.1 are hydrogen, halogen or an organic group and m and n are 1 to 4, wherein the proportion of the carbonate structural unit of the formula (II) being 2 to 15 mole % based on the amount of the carbonate structural unit of the formulas (I) and (II), and the viscosity average molecular weight of the copolymer being 15,000 to 40,000.
Claims7
A polycarbonate copolymer which comprises a main chain comprising (a) a carbonate structural unit of the formula (I):
- ##STR11## wherein A is selected from the group consisting of an alkylidene group having 1 to 12 carbon atoms, an alkylene group having 1 to 15 carbon atoms, an arylene group having 6 to 15 carbon atoms, an arylalkylene group having 7 to 15 carbon atoms, --O--, --S-- and --SO.sub.2 -- or A is a single bond, and
- (b) a carbonate structural unit of formula (II):
- ##STR12## wherein X.sup.1 and Y.sup.1 are independently selected from the group consisting of a hydrogen atom, a halogen atom and an organic group having 1 to 8 carbon atoms, and m and n are independently an integer of 1 to 4,
- the proportion of the carbonate structural unit of the formula (II) being 2 to 15 mol % based on the total amount of the carbonate structural unit of the formula (I) and the carbonate structural unit of the formula (II),
- the copolymer having a viscosity average molecular weight of 15,000 to 40,000 and the copolymer containing less than 200 ppm of residual chlorine-based solvent.
Dependencies are inferred from the claim text.