A process for the preparation of a stabilizer mixture containing a low amount of chloride comprising a) 50-80% by weight of tetrakis(2,4-di-tert-butylphenyl)biphenylene diphosphonite and its isomers, b) 5-25% by weight of bis(2,4-di-tert-butylphenyl)biphenylene monophosphonite and its isomers, and c) 5-25% by weight of a tris(2,4-di-tert-butylphenyl) phosphite, and where the sum of components (a), (b) and (c) is not greater than 100% by weight, by reacting biphenyl under Friedel-Crafts condition with phosphorus trichloride and aluminium trichloride and by reacting the product mixture with 2,4-di-tert-butyl-phenol in the presence of a tertiary amine or an aromatic amine and a solvent, separating the formed two layers, which process comprises treating the solvent layer with water, a base and a desiccant, separating the precipitate from the solution containing the stabilizer mixture and evaporating the solvent.

Процесс для подготовки смеси стабилизатора содержа низкое количество хлорида состоя из a) 50-80% by weight of diphosphonite tetrakis(2,4-di-tert-butylphenyl)biphenylene и свои изомеры, b) 5-25% by weight of monophosphonite bis(2,4-di-tert-butylphenyl)biphenylene и свои изомеры, и c) 5-25% by weight of ортофосфит трис(2,я-tris(2,4-di-tert-butylphenyl)-tert-butylphenyl), и где сумма компонентов (a), (b) и (c) не greater than 100% весом, путем реагировать бифенил под Фриедел-Korabl4mi подготовляет с трихлоридом фосфора и трихлоридом алюминия и путем реагировать смесь продукта с 2,4-di-tert-butyl-phenol in the presence of третичный амин или ароматичный амин и растворитель, отделяя сформированные 2 слоя, которому процесс состоит из обрабатывать растворяющий слой с водой, основание и desiccant, отделяющ преципитат от разрешения содержа смесь стабилизатора и испаряя растворитель.