Silicone-polycarbonate block copolymers

Details Silicone-polycarbonate block copolymers Silicone-polycarbonate block copolymers

1989-03-06

1990-07-31

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 25, 528 29, C08G 7704

Patent

active

049451480

ABSTRACT:
Silicone-polycarbonate block copolymers are provided resulting from the reaction of certain siloxy aromatic imide siloxanes or hydroxyaromatic ester siloxanes which are made by effecting reaction between an organosiloxane having terminal aromatic anhydride groups or aromatic haloacyl groups which are each attached to silicon by silicon arylene linkages with an appropriate bishydroxyarylene compounds or hydroxyarylene amino compound. The aforementioned hydroxyaromatic imide siloxanes or hydroxyaromatic ester siloxanes are then phosgenated with a dihydric phenol or an aromatic bischloroformate. The silicone-polycarbonate block copolymers have been found to be flame retardant and useful as dielectric films and membranes, and as flame retardants in aromatic polycarbonates.

REFERENCES:
Harold Rosenberg, et al.; Siloxane-Modified Polyarylene Carbonates, (Modification of Polymers) pp. 457-468, 1979.
Chemical Abstracts, pp. 1903-1904, vol. 63, 1965.
Howard A. Vaughn, Polymer Letters, pp. 569-572, vol. 7, 1969.
Will D. Merritt, Jr., Organopolysiloxane-Polycarbonate Block Copolymers Ref. #136962, 152338 and 153605, Chemical Abstracts, vol. 81, 1974.

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