Brominated and epoxidized flame retardants
AssigneeDow Global Technologies LLC
InventorsErin B. Vogel, Shari L. Kram, Daniel J. Murray, Bruce A. King
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Abstract
Brominated and epoxidized organic compounds are useful flame retardants for polymers such as polystyrene. The organic compounds contain both bromine and oxirane groups, and have molecular weights of at least 1500. The brominated and epoxidized organic compounds can be prepared by sequentially brominating and epoxiding (in either order) a starting compound that contains multiple non-conjugated carbon-carbon double bonds.
Claims17
A brominated and epoxidized organic compound having a molecular weight of at least 1500, a bromine content of at least 35% by weight and at least one oxirane group per molecule, and which has a 5% weight loss temperature of at least 180° C., wherein the brominated and epoxidized organic compound is a brominated and epoxidized homopolymer or copolymer of butadiene or a brominated and epoxidized ester of a polyol and one or more fatty acids.
A process for preparing a brominated and epoxidized butadiene polymer, comprising (a) brominating a starting butadiene polymer having a molecular weight of at least 700 and which has both 1,4-butadiene units and 1,2-butadiene units, such that at least 90% of the 1,4-butadiene units are brominated and at most 90% of the 1,2-butadiene units are brominated;
- and then (b) epoxidizing at least one of the remaining unbrominated 1,2-butadiene units to form a brominated and epoxidized butadiene polymer.
Dependencies are inferred from the claim text.