Free-radical modified fire-retardant polypropylenes

Details Free-radical modified fire-retardant polypropylenes Free-radical modified fire-retardant polypropylenes

1990-03-26

1992-01-07

Hoke, Veronica P.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524142, 524370, 524380, 524410, 524411, 524412, 524467, 524469, C08K 53417, C08K 506, C08K 514

Patent

active

050792830

ABSTRACT:
A flame-retardant polypropylene composition comprises a modified polypropylene-based polymer, antimony oxide or sodium antimonate, and a halogenated organic compound or, in lieu thereof, a phosphorous-containing compound. The polypropylene-based polymer is modified in the presence of a free-radical generator source which typically is an organic peroxide so that it has a narrow polydispersity range, improved flow, and lower compounding and molding temperatures so that temperature-sensitive components are protected from thermal degradation. The modification of the polypropylene-based polymer generally occurs in situ in the processing apparatus and the composition can also contain various fillers, fibers, and the like.

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