| abstract |
PROBLEM TO BE SOLVED: To provide a method for producing siloxane-polycarbonate copolymers and blends of these copolymers with other polycarbonates. Aromatics by mixing one or more aromatic dihydroxy compounds with phosgene, phase transfer catalysts, aqueous and organic solvents under interfacial reaction conditions while maintaining the pH in the range of about 3 to about 8. Bischloroformate is produced and this aromatic bischloroformate is used to produce a siloxane-polycarbonate copolymer. The copolymers and blends thus obtained have excellent transparency and physical properties. |