Copolycarbonate having improved low-temperature impact strength

Details Copolycarbonate having improved low-temperature impact strength Copolycarbonate having improved low-temperature impact strength

C - Chemistry, Metallurgy

08

G

C08G 77/448 (2006.01) C08G 64/18 (2006.01)

Patent

CA 2146424

A thermoplastic copolycarbonate resin having improved low temperature impact strength and a process for the preparation of the resin are disclosed. Accordingly the structure of the copolycarbonate contains (i) units of the formula (see formula I) wherein D is a divalent residue of a dihydroxy compound, and (ii) units of the formula (see formula II) wherein m is 1-90 , n is 5 - 300, R is an alkyl or a phenyl radical p is 2-12 and q is 2-20. The preparation of the copolycarbonate entails reactive blending of polycarbonate with a suitable lactone siloxane copolymer in the presence of a transesterification catalyst.

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