Preparation of segmented block copolycarbonates

Details Preparation of segmented block copolycarbonates Preparation of segmented block copolycarbonates

C - Chemistry, Metallurgy

08

G

400/2013

C08G 64/18 (2006.01) C08G 64/10 (2006.01)

Patent

CA 2001219

ABSTRACT Segmented block copolycarbonates from diphenols and tetrahalogenated diphenols are prepared by phosgen- ation under interfacial reaction conditions initially at a higher pH during which diphenol polycarbonate oligomers are formed, and thereafter at a lower pH during which tetrahalogenated diphenol bischloroformates are formed, followed by copolymerization utilizing an activated pyridine catalyst. Alternatively, diphenol polycarbonate oligomers and tetrahalogenated diphenol chloroformates may be coupled, utilizing an activated pyridine catalyst, to prepare segmented block copolycarbonates. 37,011-F

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