Method for producing polycarbonate-polyorganosiloxane copolymer

A method of producing a polycarbonate-polyorganosiloxane copolymer, comprising a step (Q) of causing a polycarbonate oligomer and at least one of polyorganosiloxanes represented by the following general formulae (i) to (iii) to react with each other in an organic solvent, wherein in the step, a solid content weight x (g/L) of the polycarbonate oligomer in 1 L of a mixed solution of the organic solvent and the polycarbonate oligomer, a concentration y (mass %) of the polyorganosiloxane in the polycarbonate-polyorganosiloxane copolymer to be obtained, and a chain length n of the polyorganosiloxane satisfy any one of conditions described by following formulae (I-I), (I-II), (I-III), (II-I), (II-II), (II-III), (III-I), and (IV-I):

• 36≤n<75,15≤y<26,80≤x<190, (I-I):
• 36≤n<75,26≤y≤35,80≤x≤170, (I-II):
• 36≤n<75,35<y≤50,80≤x≤130, (I-III):
• 75≤n≤110,10≤y<20,80≤x≤190, (II-I):
• 75≤n≤110,20≤y≤30,80≤x≤145, (II-II):
• 75≤n≤110,30<y≤50,80≤x≤130, (II-III):
• 110<n≤200,5≤y≤15,130≤x≤185, (III-I):
• 200<n≤350,5≤y≤10,130≤x≤185 (IV-I):
• wherein R3 to R6 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and a plurality of R3, R4, R5 or R6 may be identical to or different from each other, Y represents —R7O—, —R7COO—, —R7NH—, —R7NR8—, —COO—, —S—, —R7COO—R9—O—, or —R7O—R10—O—, and a plurality of Y may be identical to or different from each other, the R7 represents a single bond, a linear, branched or cyclic alkylene group, an aryl-substituted alkylene group, a substituted or unsubstituted arylene group, or a diarylene group, R8 represents an alkyl group, an alkenyl group, an aryl group, or an aralkyl group, R9 represents a diarylene group, R10 represents a linear, branched, or cyclic alkylene group, or a diarylene group, Z represents a hydrogen atom or a halogen atom, and a plurality of Z may be identical to or different from each other, β represents a divalent group derived from a diisocyanate compound, or a divalent group derived from a dicarboxylic acid or a halide of a dicarboxylic acid, n represents the chain length of the polyorganosiloxane, and n−1, and p and q each represent a number of repetitions of a polyorganosiloxane unit and each represent an integer of 1 or more, and a sum of p and q is n−2.