Chevron Research & Technology Company

Chevron Research and Technology Company, a Division of Chevron U.s.a.

Wesley A Middleton

Nancy K Smrcka

A railway diesel engine lubricating composition is essentially free of zinc dithiophosphate wear inhibitors and chlorinated inhibitors. This composition has an oil of lubricating viscosity; a noncarbonated sulfurized calcium alkyl phenate, a carbonated sulfurized calcium alkyl phenate, a calcium Mannich alkyl phenate, and an ethylene carbonate modified polybutene bis-succinimide. The noncarbonated sulfurized calcium alkyl phenate has a sulfur to metal ratio of between 1.1:1 and 2:1, the alkyl group of that phenate has from 8 to 35 carbon atoms, and the alkalinity value of that phenate is from 40 to 200 mg. KOH/gram. The noncarbonated sulfurized metal alkyl phenate is prepared by reacting a tetrapropylene phenol, sulfur, and a calcium base.

Chlorine-free diesel engine lubricating composition

Essentially chlorine-free lubricating compositions having a TBN of 10-30 designed for use in internal combustion engines having silver bearing parts which provide protection for said bearings via the incorporation therein of certain unsaturated aliphatic carboxylic acids. An additive concentrate for said lubricating compositions is also disclosed.

Growing community of inventors

Concord, CA, United States of America

Wesley A Middleton