Ignition resistant carbonate polymer blends containing low molec

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

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525 67, 525108, 525115, 525133, 525463, 524109, 524114, C08L 6900, C08L 6302

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active

053508025

ABSTRACT:
Blends of carbonate and monovinylidene aromatic copolymers containing selected low molecular weight halogenated epoxy compounds, in combination with tetrafluoroethylene polymers, are shown to have surprising combinations of impact and ignition resistance and be very suitable for electroplating applications. In general the selected epoxy compounds can be represented by the following formula: ##STR1## where, preferably, R is hydrogen; X is bromine; i is 2; L is 2,2-isopropyl; n is from 0 to 1. Polymer blends based on from about 65 to about 98 weight percent carbonate polymer, from about 2 to about 25 percent by weight monovinylidene aromatic copolymer, preferably rubber modified, and from 0 to about 10 percent by weight of a rubbery core/shell graft copolymer impact modifier are suitable for preparation of these compositions. It has been found desirable to employ from about 1 to about 20 percent by weight low molecular weight halogenated epoxy compound, and from 0.01 to about 2 percent by weight of a tetrafluoroethylene polymer.

REFERENCES:
patent: 4456732 (1984-06-01), Nambu et al.
patent: 4786686 (1988-11-01), Laughner
patent: 4810739 (1989-03-01), Lindner et al.
patent: 4879329 (1989-11-01), Hongo et al.
patent: 5087663 (1992-02-01), Laughner

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