| abstract |
A fire retardant additive comprising particles of a polymer of: n 1. at least one halogen-containing alpha, beta-ethylenically unsaturated monomer; n 2. at least one bis(hydrocarbyl)vinyl phosphonate having the structure: ##STR1## wherein X is selected from the group consisting of hydrogen, halogen, cyano, aryl C 1 -C 18 alkyl, and ##STR2## wherein R and R' are hydrocarbyl and substituted hydrocarbyl groups which can be the same, different or conjoint; and, n 3. at least one third comonomer selected from the group consisting of alpha olefins, vinyl esters of carboxylic acids, C 1 -C 20 alkyl esters of acrylic and methacrylic acid, ethylenically unsaturated dicarboxylic acids, the corresponding anhydrides thereof and the C 1 -C 20 mono and dialkyl esters thereof, amides of ethylenically unsaturated carboxylic acids and the N-methylol and diacetone derivatives thereof, vinyl aryl compounds, C 1 -C 20 alkyl vinyl ethers, aliphatic dienes and glycidyl esters of acrylic and methacrylic acid. n The polymers of the present invention are useful as fire retardant additives for coatings, adhesives, binders, impregnants, laminants, paint bases, other polymers and the like. |