Chemtura Corporation

Lanxess Solutions US Inc.

Jun Dong

Cyril A Migdal

Michael E Gelbin

Gerard Mulqueen

Jonathan S Hill

Joseph F Stieber

Maurice Power

William D Phillips

Michael J Goode

Alan Holt

The invention relates to antioxidant compositions for lubricants and organic polymers comprising a first antioxidant comprising a reaction product of p-cresol, dicyclopentadiene and isobutylene; and a second antioxidant comprising a diarylamine. The first antioxidant preferably has the structure: wherein n is 0-50, and Rand Rare independently hydrogen, a straight or branched C-Calkyl or alkylene group optionally substituted with one or more substituents, C-Ccycloalkyl, C-Caryl, or C-Calkylaryl. The second antioxidant preferably has the formula:(R)&#x2014;Ar&#x2014;NH&#x2014;Ar&#x2014;(R)wherein Arand Arare independently aromatic hydrocarbon groups and Rand Rare independently hydrogen or hydrocarbyl groups having from 6 to about 100 carbon atoms and a and b are independently 0 to 3 but (a+b) is not greater than 4.

Antioxidant compositions

A substituted phosphite suitable for lubricating base stocks and thermoplastic polymers represented by the structure: wherein Ris selected from the group consisting of C-Calkyl and C-Ccycloalkyl; Rand Rare selected to form a C-Caryl; and Rand Rare selected from the group consisting of H, C-Calkyl, C-Calkenyl, C-Ccycloalkyl, and C-Caryl. The substituted phosphite may be combined with at least one primary antioxidant as well as other additives.

Phosphite stabilizer for lubricating base stocks and thermoplastic polymers

A lubricant composition is disclosed that comprises lubricating oil and a mixture of at least two antioxidants, the first antioxidant being a substituted diphenylamine and/or a heterocyclic amine and the second antioxidant being a substituted phenol. Also disclosed is a method of increasing the oxidation stability of a lubricating oil comprising adding thereto at least two antioxidants, the first antioxidant being a substituted diphenylamine and/or a heterocyclic amine and the second antioxidant being a substituted phenol.

Stabilizing compositions for lubricants

Disclosed herein are highly stable styrenated phenolic compositions that are liquids at room temperature, and polymer articles and lubricant compositions containing such styrenated phenolic compositions. Also disclosed are processes for forming such styrenated phenolic compositions, which processes afford distyrenated phenolics assaying at 70% minimum by total GC area, comprising reacting styrene with one or more phenolics, e.g., at least one of phenol, p-cresol and/or o-cresol, in the presence of an acid catalyst, preferably a sulfonic acid catalyst, at elevated temperature, wherein the resulting product mixture comprises one or more monostyrenated phenolics, one or more distyrenated phenolics, and one or more tristyrenated phenolics.

Liquid styrenated phenolic compositions and processes for forming same

A stabilized lubricant composition is disclosed that comprises lubricating oil and a mixture of (a) at least one organophosphite compound and (b) at least one aromatic secondary amine or one substituted phenol or mixtures thereof. The compositions have been found to be highly resistant to oxidation under demanding service conditions and to be useful as turbine lubricants.

Stabilized lubricant compositions

A stabilized lubricant composition is disclosed that comprises lubricating oil and a mixture of (a) at least one organophosphite compound and (b) at least one aromatic secondary amine or one substituted phenol or mixtures thereof. The compositions have been found to be highly resistant to oxidation under demanding service conditions.

A lubricant composition is disclosed that comprises lubricating oil and a mixture of at least two antioxidants, the first antioxidant being a secondary diarylamine and the second antioxidant being a substituted para-phenylenediamine. Also disclosed is a method of increasing the oxidation stability of a lubricating oil comprising adding thereto at least two antioxidants, the first antioxidant being a secondary diarylamine and the second antioxidant being a substituted para-phenylenediamine.

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Waterbury, CT, United States of America

Jun Dong