Methods for producing polycarbonate copolymer and polysiloxane compound, polycarbonate copolymer, polysiloxane compound, composition, and molded body

A method for producing a polycarbonate copolymer having a siloxane constituent unit represented by any one of the following formula (1-1) and formula (1-2), and a polycarbonate constituent unit represented by any one of the following formula (3-1) and formula (3-2), wherein

• the method comprises polymerization:
• in the presence of a transesterification catalyst,
• a silane compound selected from:
• a diaryloxy silane compound comprising, at least, any one of dialkyldiaryloxy silane, diaryldiaryloxy silane, and monoalkylmonoaryldiaryloxy silane,
• a dialkoxy silane compound comprising, at least, any one of dialkyldialkoxy silane, diaryldialkoxy silane, and monoalkylmonoaryldialkoxy silane, and
• a silicon compound comprising at least one of a cyclic siloxane compound and a linear siloxane compound;
• a carbonate compound;
• and
• a diol compound comprising an aromatic diol compound, wherein
• the method further comprises pressure reduction comprising gradually reducing the reaction pressure to 400 Pa or less in the polymerization;
• in the polymerization, the polycarbonate copolymer is produced, while removing alcohol generated as a by-product and derived from the carbonate compound, in a molten state and under reduced pressure;
• wherein the ratio between the total number of moles of the carbonate compound and the silane compound and the mole number of the diol compound, used in the polymerization is 0.9 or more and 1.2 or less;
• and
• the polycarbonate copolymer comprises 30% by weight or less and 0.01% by weight or more of a low molecular weight compound having a weight average molecular weight of 1,000 or less:
• wherein, in the above formulae (1-1) and (1-2), R1 and R2 each independently represent an alkyl group containing 1 to 20 carbon atoms and optionally having a substituent, or an aryl group containing 6 to 30 carbon atoms and optionally having a substituent,
• R3 to R10 and R30 to R33 each independently represent hydrogen, halogen, alkoxy, an alkyl group containing 1 to 20 carbon atoms and optionally having a substituent, an alkenyl group containing 2 to 20 carbon atoms and optionally having a substituent, or an aryl group containing 6 to 30 carbon atoms and optionally having a substituent,
• Z1 and Z2 each independently represent an alkylene group containing 1 to 5 carbon atoms and optionally having a substituent,
• J1 each independently represents an integer of 1 or more and 5 or less,
• K1 each independently represents an integer of 1 or more and 5 or less,
• X represents:
• wherein X is a fluorene ring structure formed by the binding of R11 and R12, and
• wherein, in the above formulae (3-1) and (3-2), R13 to R20 and R40 to R51 each independently represent hydrogen, halogen, alkoxy, an alkyl group containing 1 to 20 carbon atoms and optionally having a substituent, an alkenyl group containing 2 to 20 carbon atoms and optionally having a substituent, or an aryl group containing 6 to 30 carbon atoms and optionally having a substituent,
• Z3 and Z4 each independently represent an alkylene group containing 1 to 5 carbon atoms and optionally having a substituent,
• J2 each independently represents an integer of 1 or more and 5 or less,
• K2 each independently represents an integer of 1 or more and 5 or less
• Y represents:
• wherein Y is a fluorene ring structure formed by the binding of R21 and R22,
• wherein the molar ratio between the siloxane constituent unit and the polycarbonate constituent unit is 30:70 to 99.9:0.01;
• and
• wherein the transesterification catalyst comprises an alkali metal compound and/or an alkaline-earth metal compound.