Great Lakes Chemical Corporation

General Electric Company

Arthur G Mack

Enrico J Termine

Larry D Timberlake

Richard S Rose

James D Siebecker

Rastko I Mamuzic

David C Sanders

Donald M Kulich

Thomas B Cleveland

Jeffrey A Schreier

Mary G Harscher

Dave C Sanders

Provided are methods for the preparation and purification of alkyl tetrahalophthalate esters by the reaction of a tetrahalophthalic compound with an alkanol in the presence of a titanate catalyst. More particularly, improved methods are provided for making and recovering an ester with little contamination by catalytic metal components and color bodies, and with little acidity, in a high yield from the esterification reaction by pretreating the starting materials to reduce the acidity thereof, reacting the starting materials in the presence of a titanate catalyst, stripping excess alcohol, hydrolyzing the catalyst, and filtering out solids to yield a high purity tetrahalophthalate ester product.

Efficient methods for making tetrahalophthalate esters having excellent

A preferred process for producing a brominated, non-fused aromatic composition involves a continuous bromination in a continuous, mixed reactor such as a continuous stirred tank reactor. Bromine and the aromatic substrate, and optionally a bromination catalyst, are continuously fed to a reaction zone to form a reaction mixture, and the reaction mixture is continuously withdrawn from the reaction zone after an established average residence time. Bromination levels can be readily controlled by controlling the average residence time of the reaction mixture within the reaction zone. Preferred continues processes also provide mixed, brominated compositions having product distributions which are substantially broader than that obtained by batch brominations conducted to achieve the same level of bromination. Preferred products thus have broad melting ranges which are advantageous in compounding operations.

Continuous bromination process and products thereof

A flame retardant thermoplastic composition is provided containing a vinyl aromatic resin and a flame retardant. The flame retardant is an oligomeric condensation product of a halogenated aromatic diol and an alkylene dihalide composition which is preferably an admixture of an alkyl monohalide and an alkylene dihalide. The compositions are useful for making molded articles for automotive parts and for business machine housings. The composition exhibit no bloom, good thermal color stability, and good resistance to ultraviolet light.

Vinyl aromatic resin compositions containing condensation product of

Fire-retardant tetrabromobisphenol oligomers of the formula: ##STR1## R or R' is a branched or unbranched alkyl radical; X.sub.i is a halogen, wherein i is an integer from 0 to 4;

Alkyl end-capped, halogenated polyethers

Described are processes for preparing brominated diphenylalkane products which are far whiter than prior known brominated diphenylalkane products. The resultant white brominated diphenylalkane products also form a part of the present invention, as do formulations incorporating the white brominated diphenylalkane products, and articles prepared therefrom.

Brominated diphenylalkane products and processes

A reduced methyl bromide process for making tetrabromobisphenol A in methanol, including: dissolving bisphenol-A in a methanol solvent to form a bisphenol-A methanol solution, adding bromine to the bisphenol-A methanol solution to brominate bisphenol-A and form tetrabromobisphenol A and hydrogen bromide, exposing the bisphenol-A methanol solution to an amount of a hydrogen peroxide agent to reduce the amount of methyl bromide co-product resulting from the bromination of bisphenol-A in methanol by reducing the amount of hydrogen bromide co-product available to react with the methanol, and collecting the resulting tetrabromobisphenol A product thus formed after the bromination is substantially complete.

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Lafayette, IN, United States of America

Arthur G Mack