Polycarbonate - production method of polyorganosiloxane copolymer

And polycarbonate oligomer has the following general formula (i) ~ at least one and the step of reacting in an organic solvent of the polyorganosiloxane represented by (iii) (Q), in said step, the organic solvent and polycarbonate and oligomer mixture solid weight of polycarbonate oligomer in the 1L x of (g / L), the obtained polycarbonate - the concentration of the polyorganosiloxane in the polyorganosiloxane copolymer y (wt%), the polyorganosiloxane and a chain length n, wherein the specific condition is satisfied, polycarbonate - production method of polyorganosiloxane copolymer