Preparation of segmented block copolycarbonates

Details Preparation of segmented block copolycarbonates Preparation of segmented block copolycarbonates

1988-10-24

1990-02-20

Pertilla, Theodore E.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528199, 528202, C08F28302

Patent

active

049027581

ABSTRACT:
Segmented block copolycarbonates from diphenols and tetrahalogenated diphenols are prepared by phosgenation, 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.

REFERENCES:
patent: 3119787 (1964-01-01), Laakso et al.
patent: 3912687 (1975-10-01), Haupt et al.
patent: 4075119 (1978-02-01), Schmidt et al.
patent: 4308373 (1981-12-01), Mori et al.
patent: 4413103 (1983-11-01), Katsuhisa et al.
patent: 4737573 (1988-04-01), Silva et al.

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