Halogen containing polyester resins having improved smoke-resistance

Abstract

Fire retardant polymer compositions having improved smoke-retardance are prepared from: 1. a copolymerizable mixture of: A. from about 50 to 80 weight percent of an .alpha.-,.beta.-, ethylenically unsaturated halogen-containing polyester of a polycarboxylic compound and a polyhydric alcohol, the polyester containing halogen in a proportion of greater than about 4 weight percent; and B. from about 20 to about 50 weight percent of a mixture of unsaturated monomers comprising a vinyl-benzene compound and an acrylic compound selected from the group consisting of acrylic acid, methacrylic acid and esters of these acids, the weight ratio of vinylbenzene compound to acrylic compound being about 1:4 to 4:1; and 2. an effective fire retardant proportion of about 0.5 to about 10 weight percent of a smoke inhibiting additive comprising at least 0.5 weight percent of a compound of iron as the sole fire retardant additive or as a component of an additive mixture of an iron compound and an antimony compound and/or a copper compound.

Dependencies are inferred from the claim text.