Polycarbonate-polysiloxane copolymers, methods for the preparation thereof, and articles derived therefrom

A polycarbonate-polysiloxane copolymer comprising

• structural units of the formula
• wherein each R1, R2, and R3 is independently the same or different monovalent C1-13 hydrocarbon group, each R4 and R5 taken together is independently the same or different divalent C3-30 hydrocarbon linking group wherein R4 is a C1-28 hydrocarbon and R5 is a C2-29 aliphatic group, a is 0 or greater, and b is one or greater, and wherein G is of the formula
• wherein R10 is a hydrogen atom or a C1-8 monovalent hydrocarbon group, m is 0 to 20, n is 0 to 20, and o is 0 to 20, provided that m+n+o is 1 to 20;
• and
• structural units of the formula
• wherein each R is independently the same or different C1-60 divalent hydrocarbon group,
• and at least 60% of the R groups comprise an aromatic moiety.