Flame retardant polycarbonate compositions with improved...

Details Flame retardant polycarbonate compositions with improved... Flame retardant polycarbonate compositions with improved...

C - Chemistry, Metallurgy

08

G

402/174

C08G 64/08 (2006.01)

Patent

CA 1193388

FLAME RETARDANT POLYCARBONATE COMPOSITIONS WITH IMPROVED CRITICAL THICKNESS ABSTRACT OF THE DISCLOSURE Polycarbonates are provided having improved critical thickness values and flame retardant characteristics based upon an aromatic diol and a halogenated thiodiphenol represented by the structural formula Image wherein X1 and X2 are halogen and "a" + "b" = 1 to 8; Y1 and Y2 are alkyl groups having 1 to 4 carbon atoms; and "c" + "d" = 0 to 7. By incorporating an effective amount of the aromatic halogenated thiodiphenol, based upon the total aromatic diol content, into the polymer the critical thickness and flame retardant characteristics of the poly- carbonate are substantially improved, a process for the preparation of the monomer of said structural formula is likewise provided.

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