Compositions of siloxane polycarbonate block copolymers and high

Details Compositions of siloxane polycarbonate block copolymers and high Compositions of siloxane polycarbonate block copolymers and high

1994-08-15

1995-10-03

Buttner, David

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

Synthetic resins

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

525425, 525433, 525439, 525464, 525467, 525469, C08L 6900, C08L 6702, C08L 8310, C08G 77448

Patent

active

054553105

ABSTRACT:
A thermoplastic composition which comprises a siloxane polycarbonate block copolymer wherein the polysiloxane segments of the copolymer are of the formula: ##STR1## where R.sup.1, R.sup.2, Y, D, A, X, A' and E are as defined herein, and high heat polycarbonates containing recurring or repeating polycarbonate units of the formula: ##STR2## wherein Z is --O--, --N(R.sup.3)-- or a mixture thereof and R.sup.3 is selected from hydrogen, hydrocarbyl and halogen-substituted hydrocarbyl.

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