Copolycarbonate

A copolycarbonate comprising 10 to 90 mol % of a unit (A) represented by the following formula (A) and 90 to 10 mol % of a unit (B) represented by the following formula (B) and having terminals satisfying the following expressions (i) and (ii),

• wherein each of R1 to R4 is independently a hydrogen atom or an alkyl group having 1 to 10 carbon atoms,
• wherein each of R5 and R6 is independently a halogen atom or a hydrocarbon group having 1 to 10 carbon atoms, the hydrocarbon group may contain an aromatic group, each of m and n is independently an integer of 0 to 4, and W is a group selected from the following formulae,
• wherein each of R9 and R10 is independently a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, an alkyl group having 1 to 9 carbon atoms, an alkoxy group having 1 to 5 carbon atoms or an aryl group having 6 to 12 carbon atoms
• 0.0001<(a)/(d)<0.1 (i)
• 0.02<(b)/(d)<0.8 (ii)
• wherein (a) is an amount of terminal group represented by the following formula,
• in which R1 to R4 are as defined in the unit (A),
• (b) is an amount of terminal group represented by the following formula,
• in which R5, R6, m, n and W are as defined in the unit (B),
• (d) is a total terminal group amount and a total amount of (a), (b) and (c), and
• a formula (c) is a terminal group represented by the following formula