Method for preparing block polyphenylene ether-polycarbonates

Details Method for preparing block polyphenylene ether-polycarbonates Method for preparing block polyphenylene ether-polycarbonates

1987-11-23

1991-04-23

Ziegler, Jacob

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

Synthetic resins

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

525 68, 525905, C08G 6548, C08G 6900, C08G 7112

Patent

active

050101439

ABSTRACT:
Block polyphenylene ether-polycarbonates are prepared by blending a mixture of at least one polyphenylene ether wherein all phenolic end groups are in the free phenol form; at least one cyclic polycarbonate oligomer, preferably an oligomer mixture; and a catalyst for conversion of cyclic polycarbonates to linear polycarbonates; and heating said mixture to polymerization temperature. The preferred catalysts are phenoxides, salts of polycarbonate oligomers and tetraphenylborate salts. The method may be conducted in the melt or in solution, and is adaptable for employment in reactive processing operations.

REFERENCES:
patent: 3875256 (1975-04-01), White
patent: 4605731 (1986-08-01), Evans et al.
patent: 4760117 (1988-07-01), Evans et al.

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