Polyphosphazene blends

Details Polyphosphazene blends Polyphosphazene blends

1977-06-01

1978-02-14

Foelak, Morton

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 2P, 260 25FP, 260 25R, 260 23R, 260 47P, 260 47UA, 260874, C08J 906

Patent

active

040738248

ABSTRACT:
Polyphosphazene blends and foams thereof are described. The blends comprise of at least one polyphosphazene copolymer having a Young's Modulus of up to about 5.times.10.sup.8 dynes/cm.sup.2 and at least one polyphosphazene homopolymer or copolymer having a Young's Modulus of at least about 5.times.10.sup.8 dynes/cm.sup.2. The copolymers used to prepare the blends comprise randomly repeating units represented by the formulas ##STR1## wherein R.sub.1 and R.sub.2 are the same or different and are hydrogen, a C.sub.1 -C.sub.10 linear or branched alkyl radical, or a C.sub.1 -C.sub.4 linear or branched alkoxy radical substituted on any sterically permissible position on the phenoxy group, with the proviso that when R.sub.2 is alkoxy, R.sub.1 and R.sub.2 are different. The blends of this invention can be formed into sheets or films, or into flexible or semi-rigid foams. The blends are extremely fire retardant and produce low smoke loads, or essentially no smoke, when heated in an open flame.

REFERENCES:
patent: 3856712 (1974-12-01), Reynard et al.
patent: 3856713 (1974-12-01), Rose et al.

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