Method for preparation of block copolysiloxanecarbonates

Details Method for preparation of block copolysiloxanecarbonates Method for preparation of block copolysiloxanecarbonates

1995-03-02

1996-04-02

Dean, Ralph H.

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

Synthetic resins

From silicon reactant having at least one...

528 14, 528 21, 528 41, C08G 7708

Patent

active

055041779

ABSTRACT:
Copolysiloxanecarbonates are prepared in the melt by the reaction of a diaryl carbonate such as diphenyl carbonate with a mixture of a dihydroxyaromatic compound and a carbonate-terminated polydiorganosiloxane, the latter typically prepared by reaction of a diaryl carbonate or aryl chloroformate with a hydroxyorgano-terminated polydiorganosiloxane. By this method, incorporation of silicone units in the copolysiloxanecarbonate is maximized.

REFERENCES:
patent: 3419634 (1968-12-01), Vaughn, Jr.
patent: 3419635 (1968-12-01), Vaughn, Jr.
patent: 4945148 (1990-07-01), Rich et al.
patent: 5039772 (1991-08-01), Davis et al.
patent: 5214118 (1993-05-01), Hawkins
patent: 5243009 (1993-07-01), Rich et al.
patent: 5273685 (1993-12-01), Takata et al.

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