Cohalogenation process for polyesters
AssigneeThe Dow Chemical Company
InventorsRobert E. Hefner, Jr., Hans R. Friedli, Mark J. Hazelrigg, Jr.
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Abstract
Cohalogenation of unsaturated polyesters containing pendant unsaturation and a dicyclopentadienyl ester of an .alpha.,.beta.-unsaturated carboxylic acid is carried out at room temperature or lower to simultaneously and selectively halogenate the non .alpha.,.beta.-unsaturation. These materials have utility in plastics, such as fire-retardant castings.
Claims17
A process for preparing halogenated compositions of (1) and .alpha.,.beta.-unsaturated polyester containing pendant unsaturated groups, (2) a dicyclpentadienyl ester of an .alpha.,.beta.-unsaturated carboxylic acid and (3) a reactive diluent, said process comprising the reaction of (a) a blend of (1) and (2) in proportions that the total unsaturation of pendant and dicyclopentadienyl unsaturation equals, when halogenated, the amount of halogen desired in said halogenated composition, with (b) about a stoichiometric amount, based on said total non .alpha.,.beta.-unsaturation, of halogen, said reaction conducted at a temperature of less than about 25.degree. C. until halogenation is substantially complete, after which a polymerization inhibitor-stabilizer is added, any solvent removed, followed by the addition of said reactive diluent.
Dependencies are inferred from the claim text.