Brominated biphenol process

Details Brominated biphenol process Brominated biphenol process

C - Chemistry, Metallurgy

07

C

260/616.4

C07C 39/24 (2006.01) C07C 37/62 (2006.01) C07C 43/174 (2006.01)

Patent

CA 1073471

AN IMPROVED BROMINATED BIPHENOL PROCESS Abstract of the Disclosure Brominated biphenols are produced by a bromination process which comprises reacting bromine with a 3,3',5,5'- tetrasubstituted diphenoquinone at a temperature below about +20° C. in the presence of a diluent wherein the bromine to diphenoquinone mole ratio is greater than about 6.5:1, evolving hydrogen bromide gas at a temperature of at least about +15° C., heating the resulting reaction mixture at elevated temperatures to complete the bromination reaction and recovering the desired 2,2',6,6'-tetrabromo-3,3',5,5'- tetrasubstituted-4,4'-biphenol. The biphenol products of the process can be used as antioxidants, as monomeric starting materials for polymeric halogenated organic compounds which are fire retardant as well as monomeric flame retardant additives for polymeric compositions useful in molding, coating and insulating various articles of manufacture.

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