C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
400/5602, 400/75
C08K 5/52 (2006.01) C07F 9/6571 (2006.01) C07F 9/6574 (2006.01) C08K 5/527 (2006.01) C08K 5/5398 (2006.01)
Patent
CA 1190556
ABSTRACT OF THE DISCLOSURE This invention is directed to an aromatic bis(di-Y-dioxaphosphorinane) represented by the formula: Image wherein Ar is a divalent aromatic radical having each of its valences on an aromatic ring; each Y is individ- ually oxygen or sulfur; n is a whole number from 1 to 10; m is a whole number from 1 to 3; each R is individ- ually a divalent aliphatic radical and each R' is individually hydrogen or a monovalent radical provided that the aromatic bis(di-Y-dioxaphosphorinane) is inert to a carbonate polymer. This invention is also directed to polycarbonate compositions containing the bis(di-Y- -dioxaphosphorinane) compounds as thermal stabilizers These compositions show improved extrusion stability, thermal stability, hydrolytic stability a ?sured by the amount of change in melt flow viscosity, yellowness index and Izod impact strength.
417306
Mcewen Gerald K.
Thomas Lowell S.
Smart & Biggar
The Dow Chemical Company
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