Liquid antioxidant produced by alkylating diphenylamine with a m

Details Liquid antioxidant produced by alkylating diphenylamine with a m Liquid antioxidant produced by alkylating diphenylamine with a m

1988-01-11

1989-04-25

Thexton, Matthew A.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252 50, 564409, C09K 1518

Patent

active

048246018

ABSTRACT:
Process is described for the production of a liquid antioxidant composition by reaction of diphenylamine with diisobutylene comprising reacting diphenylamine with diisobutylene in a molar ratio of from 1:1.1 to 1:2.5 and in the presence of an acid activated earth catalyst, while ensuring that the concentration of diisobutylene remains substantially constant throughout the reaction period at a reaction temperature of at least 160.degree. C., the reaction being effected for such a period that the content of 4,4'-dioctyldiphenylamine in the reaction mass, excluding catalyst, is below 25% by weight; and removing catalyst and unreacted diisobutylene; the product of this process; and the use of this product as a stabilizer for organic material against oxidative degradation.

REFERENCES:
patent: 2943112 (1960-06-01), Popoff et al.
patent: 3201486 (1965-08-01), Bielawski et al.
patent: 3496230 (1970-02-01), Kaplan
patent: 3714258 (1973-01-01), Bayha et al.
patent: 4163757 (1979-08-01), D'Sidocky
patent: 4226732 (1980-10-01), Reinhard et al.
patent: 4248721 (1981-03-01), Jaffe
patent: 4351958 (1982-09-01), Takahata et al.
ASTM D 2272-85.
Derwent Abstract No. 85-179087/30, (Jul. 24, 1985), "Prep. of Liq. Autioxidant from Diphenylamine and Excess Diisobutylene under Specific Reaction Conditions".

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