Method for preparing fire retardant molding compositions

Details Method for preparing fire retardant molding compositions Method for preparing fire retardant molding compositions

C - Chemistry, Metallurgy

08

K

18/1214

C08K 13/02 (2006.01) C08L 25/04 (2006.01) C08L 51/04 (2006.01)

Patent

CA 1102989

APPLICATION FOR LETTERS PATENT FOR A METHOD FOR PREPARING FIRE RETARDANT MOLDING COMPOSITIONS ABSTRACT OF THE DISCLOSURE Disclosed herein is a method for preparing fire retardant styrenic polymer molding compositions with improved impact strength which compositions contain a metal oxide and a halogenated fire retardant additive. The method comprises dispersing the metal oxide into a minor portion of the styrene polymer component using high intensity mixing and temperatures at or above the fusion temperature of the styrene polymer in order to obtain a uniform dispersion. The metal oxide-polystyrene dispersion is then blended with the other ingredients of the polyblend. The resulting blend is compounded at temperatures greater than 255°C. and then comminuted to form a molding composition.

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