Dispersing ignition resistant additives into carbonate polymers

Details Dispersing ignition resistant additives into carbonate polymers Dispersing ignition resistant additives into carbonate polymers

C - Chemistry, Metallurgy

08

J

400/4401

C08J 3/20 (2006.01) C08J 3/22 (2006.01) C08K 3/30 (2006.01) C08K 5/136 (2006.01) C08K 5/43 (2006.01) C08L 69/00 (2006.01)

Patent

CA 2005962

ABSTRACT A process for dispersing one or more powdered ignition resistant or flame retardant additives into carbonate polymers which comprises the steps of preparing a base concentrate having from 5 to 50 weight per cent of said additives by blending said additives with a carbonate polymer having a melt flow rate of from 3 to 20, pelletizing said base concentrate having said ignition resistant additive dispersed therein, dry blending said concentrate pellets with carbonate polymer pellets having a melt flow rate of from 1 to 80 whereby said polymer/concentrate blend has an amount of said additive dispersed therein effective to render said blend ignition resistant, and pelletizing or molding said carbonate polymer/concentrate blend. The use of this method gives ignition resistant carbonate polymers with improved impact properties as measured by Izod impact tests. 36,259B-F

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