Process for making fire retardant polypropylene

Details Process for making fire retardant polypropylene Process for making fire retardant polypropylene

1978-05-05

1980-12-02

Smith, John D.

Coating processes

With post-treatment of coating or coating material

Liquid extraction of coating constituent or cleaning coating

106 1818, 106 1819, 252 81, 427390D, 427430R, C09K 328

Patent

active

042371570

ABSTRACT:
Polypropylene and other polyolefins are rendered flame retardant by the addition of a phosphonate ester having the following formula: ##STR1## wherein a is 0, 1 or 2, b is 0, 1 or 2, c is 1, 2 or 3 and a+b+c is 3; R and R' are the same or dissimilar and are alkyl, alkoxy, aryl, aryloxy, alkaryl, alkaryloxy, aralkyl, aryloyx-alkoxy, or aralkoxy, wherein the alkyl portion of these groups may contain hydroxyl but no halogen and the aryl portion may contain chlorine bromine and hydroxyl groups; R.sup.2 is alkyl, hydroxyalkyl, or aryl; R.sup.3 is lower alkyl (C.sub.1 -C.sub.4); and a wetting agent penetrant. The presence of the penetrant promotes penetration of the retardant composition into the polypropylene. This fire retardant composition is particularly useful in polypropylene fibers and fabrics particularly where the fibers are woven into a matte.

REFERENCES:
patent: 3516853 (1970-06-01), Tesoro et al.
patent: 3849368 (1974-11-01), Anderson
patent: 3877974 (1975-04-01), Mischutin
patent: 3906136 (1975-09-01), Weil
patent: 3932478 (1976-01-01), Fenyes et al.
Sanders, "Flame Retardants", C & EN, Apr. 1, 1978, pp. 22 to 35.

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