Hindered phenolic antioxidant compositions

Details Hindered phenolic antioxidant compositions Hindered phenolic antioxidant compositions

C - Chemistry, Metallurgy

07

C

C07C 39/06 (2006.01) C07C 37/20 (2006.01) C07C 39/15 (2006.01) C09K 15/08 (2006.01) C10L 1/18 (2006.01) C10L 1/183 (2006.01) C10L 10/04 (2006.01) C10M 129/14 (2006.01) C10M 161/00 (2006.01)

Patent

CA 2372755

Hindered tert-butylphenolic antioxidant compositions characterized by a low level of volatile and undesirable single-ring tert-butylphenolic antioxidants and a high level of non-volatile multi-ring (or methylene bridged) tert-butylphenolic antioxidants are obtained by reacting a specific mixture of ultra pure ortho-tert-butylphenol (OTBP), ultra pure 2,6-di-tert-butylphenol (DTBP) and formaldehyde in a solvent in the presence of catalyst. These antioxidants are further characterized by having a low level of 2,6-di-tert-butylphenol, low levels of ortho-tert-butylphenol, and trace levels of 2,4,6-tri-tert- butylphenol.

On obtient des formulations antioxydantes à base d'un tert-butylphénol stériquement encombré se caractérisant par une faible teneur en antioxydants tert-butylphénoliques monocycliques volatils et indésirables et par une forte teneur en antioxydants tert-butylphénoliques multicycliques (ou à ponts méthylène) non volatils en faisant réagir un mélange précis d'ortho-tert-butylphénol (OTBP) ultra pur, de 2,6-di-tert-butylphénol (DTBP) ultra pur et de formaldéhyde dans un solvant, en présence d'un catalyseur. Ces formulations se distinguent également par leur faible teneur en 2,6-di-tert-butylphénol, leur faible teneur en ortho-tert-butylphénol et la présence de 2,4,6-tri-tert-butylphénol à l'état de traces.

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