C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 279/22 (2006.01) C08K 5/46 (2006.01) C08L 101/00 (2006.01) C09K 15/26 (2006.01) C10M 135/36 (2006.01)
Patent
CA 2051156
A mixture containing phenothiazines which is obtainable by reacting a mixture of diphenylamines comprising 1 to 5 % by weight of~~~a) diphenylamine 8 to 18 % by weight of~~~b) 4-tert-butyldiphenylamine 21 to 31 % by weight of~~~c) one or more compounds selected i) 4-tert-octyldiphenylamine ii) 4,4'-di-tert-butyldiphenylamine iii) 2,4,4'-tris-tert-butyldiphenylamine 20 to 31 % by weight of~~~d) one or more compounds selected from i) 4-tert-butyl-4'-tert-octyldiphenylamine ii) 2,2'- or 2,4'-di-tert-octyldiphenylamine iii) 2,4-di-tert-butyl-4'-tert-octyldiphenylamine, and 15 to 29 % by weight of ~~e) the compound i) 4,4'-di-tert-octyldiphenylamine, or the compounds i) 4,4'-di-tert-octyldiphenylamine and ii) 2,4-di-tert-octyl-4'-tert-butyldiphenylamine, with 1 to 200 mol % of elemental sulfur, in the presence of 0.25 to 5 mol % of a condensation catalyst selected from the group consisting of iodine, aluminium bromide, aluminium chloride, iron(III) chloride, antimony chloride, copper iodide or sulfur iodide, in the temperature range from 80 to 250°C. The mixture containing phenothiazines finds utility as antioxidant in organic materials which are subject to degradation induced by oxidation, heat or exposure to actinic light, especially in lubricants and hydraulic fluids.
Ag Ciba-Geigy
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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