Dispersing ignition resistant additives into carbonate polymers

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

1989-08-24

1991-08-20

Hoke, Veronica P.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523351, 524411, 524412, 524423, 524467, C08K 330, C08K 543

Patent

active

050414798

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 about 5 to about 50 weight per cent of said additives by blending said additives with a carbonate polymer having a melt flow rate from about 3 to about 20, pelletizing said base concentrate having said ignition resistant additive dispersed therein, dry blending said concentrate pellets with carbonate pellets having a melt flow rate from about 1 to about 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.

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patent: 4650823 (1987-03-01), Krishnan
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