Patent ID: 8778486

Claim:
A transparent film having a birefringence of more than 0.001, comprising: a polycarbonate resin which comprises: a first structural unit derived from a dihydroxy compound represented by a general formula (1); a second structural unit derived from a dihydroxy compound represented by a general formula (2); and a third structural unit derived from at least one, a dihydroxy compound represented by general formula (5) wherein the dihydroxy compound represented by the general formula (1) is 9,9-[4-(2-hydroxyethoxy)phenyl]fluorene, wherein the first structural unit accounts for 18% by mole or more of the polycarbonate resin, and wherein the polycarbonate resin has a reduced viscosity of 0.30 dL/g or higher wherein the general formula (1), R 1 to R 4 each independently represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1-20 carbon atoms, a substituted or unsubstituted cycloalkyl group having 6-20 carbon atoms, or a substituted or unsubstituted aryl group having 6-20 carbon atoms, X represents a substituted or unsubstituted alkylene group having 2-10 carbon atoms, a substituted or unsubstituted cycloalkylene group having 6-20 carbon atoms, or a substituted or unsubstituted arylene group having 6-20 carbon atoms, and m and n each independently are an integer of 0-5; wherein the general formula (3), R 5 represents a substituted or unsubstituted, monocyclic cycloalkylene group having 4-20 carbon atoms; wherein the general formula (4), R 6 represents a substituted or unsubstituted, monocyclic cycloalkylene group having 4-20 carbon atoms; wherein the general formula (5), R 7 represents a substituted or unsubstituted alkylene group having 2-10 carbon atoms, and p is an integer of 2 to 15; wherein the general formula (6), R 11 represents either an alkyl group having 2-20 carbon atoms or the group represented by a formula (7).