Shell Oil Comapny

Hendrik Schadenberg

Aaldert J De Jong

Anthonij Wolfert

Corrie M Leenaars

Process for providing a surface with a fire-proof and/or wear resistant lining

Novel esters of dithiophosphoric acid and secondary alcohols having two beta quaternary carbon atoms, and salts of such esters suitable as additives in oil compositions are disclosed.

Dithiophosphoric acids and salts thereof and oil compositions containing

Novel compounds of the general formula: ##STR1## wherein R and R.sub.2 are hydrocarbyl groups, R.sub.1 is a hydrocarbylene group and R.sub.3 is hydrogen or a hydrocarbyl group, which groups R, R.sub.1, R.sub.2 and R.sub.3 may be substituted by or contain one or more heteroatoms or heterogroups, have utility as antioxidants for organic materials such as lubricating oils.

Compounds containing both urea and urethane groups

Lubricating compositions are provided which comprise a major amount of oil of lubricating viscosity and an effective amount of dichlorophenyl esters of hydrocarbyl dicarboxylic acids. The lubricating compositions have improved load-bearing properties. Also provided are novel dichlorophenyl esters of malonic and lower alkyl substituted malonic acid.

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Amsterdam, Netherlands

Hendrik Schadenberg