Atochem

Andre Gagnieur

Bernard Jean Gurtner

Evelyne Bonnet

Rene Bertocchio

Robert Decaudin

Henri Mathias

The invention relates to the preparation of halogenated imides derived from hydrazine and halogenated dicarboxylic acid anhydride and which can be used as flameproofing agents for plastics. The condensation of hydrazine and halogenated dicarboxylic acid anhydride is carried out in an aqueous medium, at a temperature ranging from 40.degree. to 225.degree. C., with a molar ratio of anhydride/hydrazine equal to between 0.5 and 3, preferably between 1 and 2.

Preparation of flame-resistant halogenated imides

The invention relates to the preparation of halogenated imides derived from hydrazine and halogenated dicarboxylic acid anhydride and which can be used as flameproofing agents for plastics. The condensation of hydrazine and halogenated dicarboxylic acid anhydride is carried out in an aqueous medium, at a temperature ranging from 40.degree. to 225.degree. C., with a molar ratio of anhydride/hydrazine substantially equal to 2.

Flame resistant compositions and method of using same

The invention relates to the preparation of brominated derivatives of diphenyl ether. This process includes preparing an underbrominated product and perbrominating the by-products of this reaction. This process is particularly suitable for the preparation of octabromodiphenyl ether and decabromodiphenyl ether.

Process for the preparation of brominated derivatives of diphenyl ether

Working fluid/solvent compositions for use in absorption heating and cooling equipment, which compositions comprise a chlorofluoroethane with a boiling point between -40.degree. and +50.degree. C. and at least one solvent with a boiling point above 100.degree. C., the solvent being at least one material having the formula:

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Rochetaille sur Saone, France

Andre Gagnieur