METHOD FOR PRODUCTION OF STABILIZERS WITH LOW CHLORIDE CONTENT Russian patent published in 2005 - IPC

FIELD: organic chemistry, in particular agents for stabilization of organic materials.

SUBSTANCE: invention relates to method for production of stabilizer mixture to prevent oxidative destruction, thermal destruction, or light-initiated destruction of organic materials. Claimed composition has low chloride content and comprises (mass %): a) tetrakis-biphenylene diphosphonite or isomers thereof 50-80; b) bis(2,4-di-tert-butylphenyl)-biphenylene monophosphonite or isomers thereof 5-25; c) tris(2,4-di-tert-butylphenyl) phosphite 5-25, wherein total content of a), b) and c) is not more than 100 mass %. Method is carried out by Friedel-Crafts reaction of biphenyl with phosphorus trichloride and aluminum trichloride; reaction of obtained mixture with 2,4-di-tert-butylphenol in presence of tertiary amine or aromatic amine and solvent, followed by separation of two formed layers. Method includes treatment of solvent layer with water, base and drying agent; separation of precipitate from solution containing stabilizer mixture; and solvent evaporation.

EFFECT: improved treatment method for production of stabilizers with desired chloride content and product, which is not cloudy and does not initiate cloudiness in synthetic polymers.

10 cl, 10 ex