Halophenoxyphosphazene fire retardants and polyesters containing

Chemistry of carbon compounds – Miscellaneous organic carbon compounds

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260 25AJ, 260 15, 260 40R, 260 459R, 260 75N, 260864, C08L 6704, C08L 6706

Patent

active

040790355

ABSTRACT:
The fire retardancy of polyesters is enhanced with halophenoxyphosphazenes which are reaction products of a halogenated phenol and a phosphonitrilic halide. Brominated phenols are preferred although chlorophenols can be used. Of the brominated phenols, preferred starting materials are p-bromophenol, 2,4-dibromophenol and mixtures thereof. Phosphonitrilic chlorides are preferred starting materials. Pure phosphonitrilic halides can be used; however, mixtures are preferred because of their availability. Cyclic and linear phosphonitrilic halides are useful as well as mixtures thereof. Saturated and unsaturated polyesters can be made fire retardant by this invention as can thermoplastic and thermosetting materials. Linear and crosslinked polyesters can be treated. Preferred polyesters are fiber forming polyesters of a diol and dibasic acid, such as poly(ethylene terephthalate) and poly(1,4-cyclohexylenedimethyleneterephthalate).

REFERENCES:
patent: 2109491 (1938-03-01), Lipkin
patent: 2192921 (1940-03-01), Lipkin
patent: 3206494 (1965-09-01), Lund

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