Patent ID: 8962780
Filing Date: 2015-02-24
Classification: C08G,C08L

Abstract:
1. A process of manufacturing a polycarbonate-polydiorganosiloxane copolymer comprising a polycarbonate block represented by the following formula [1] and a polydiorganosiloxane block represented by the following formula [3], wherein (i) the copolymer has an aggregation structure comprising a matrix of the polycarbonate and polydiorganosiloxane domains dispersed therein; (ii) the polydiorganosiloxane domains have an average size of 5 to 15 nm and a normalized dispersity of not more than 25%; (iii) a total light transmittance is not less than 88%; and (iv) a 2.0 mm-thick molded article obtained with the polycarbonate-polydiorganosiloxane copolymer has a haze of 0.7 to 2%, wherein R 1 and R 2 are each independently a group selected from the group consisting of hydrogen atom, halogen atom, alkyl group having 1 to 18 carbon atoms, alkoxy group having 1 to 18 carbon atoms, cycloalkyl group having 6 to 20 carbon atoms, cycloalkoxy group having 6 to 20 carbon atoms, alkenyl group having 2 to 10 carbon atoms, aryl group having 3 to 14 carbon atoms, aryloxy group having 3 to 14 carbon atoms, aralkyl group having 7 to 20 carbon atoms, aralkyloxy group having 7 to 20 carbon atoms, nitro group, aldehyde group, cyano group and carboxyl group, with the proviso that when there are a plurality of R 1 's and a plurality of R 2 's, they may be the same or different, e and f are each an integer of 1 to 4, and W is a single bond or at least one group selected from the group consisting of groups represented by the following formulas [2], wherein R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , R 17 and R 18 are each independently a group selected from the group consisting of hydrogen atom, alkyl group having 1 to 18 carbon atoms, aryl group having 3 to 14 carbon atoms and aralkyl group having 7 to 20 carbon atoms, g is an integer of 1 to 10, and h is an integer of 4 to 7, wherein R 3 , R 4 , R 5 , R 6 , R 7 and R 8 are each independently a hydrogen atom, alkyl group having 1 to 12 carbon atoms, or substituted or non-substituted aryl group having 6 to 12 carbon atoms, R 9 and R 10 are each independently a hydrogen atom, halogen atom, alkyl group having 1 to 10 carbon atoms, or alkoxy group having 1 to 10 carbon atoms, p is a natural number, q is 0 or a natural number, (p+q) is a natural number of less than 100, and X is a divalent aliphatic group having 2 to 8 carbon atoms, the process comprising the steps of: (i) reacting a dihydric phenol (I) represented by the following formula [4] with phosgene in a mixed solution of a water-insoluble organic solvent and an alkaline aqueous solution to prepare a solution containing a carbonate oligomer having a terminal chloroformate group: wherein R 1 , R 2 , e, f and W are as defined above; and (ii) adding a hydroxyaryl-terminated polydiorganosiloxane (II) represented by the following formula [5] at a rate of 0.0002 to 0.0015 mole/min based on 1 mole of the dihydric phenol (I) charged to prepare the solution while the solution is stirred to carry out interfacial polycondensation of the hydroxyaryl-terminated polydiorganosiloxane (II) and the carbonate oligomer: wherein R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , p, q and X are as defined above.