Patent ID: 6124247
Filing Date: 2000-09-26
Classification: C10M

Abstract:
A process for improving the compatibility of a lubricating oil composition, comprising at least one dispersant containing basic nitrogen atoms, with fluorocarbon elastomers, said method comprising adding an effective quantity of borated compounds having the following general formula (I): ##STR5## in which X is S or O, and R is a hydrocarbyl group containing at least 3 carbon atoms, wherein said dispersant is a bis-succinimide, and wherein:(a) when the bis-succinimide is post-treated with ethylene carbonate, the minimum ratio %Boron/% basic N of the lubricating oil composition is situated around 1.0, and(b) when the bis-succinimide is not subjected to a post-treatment step, the minimum ratio %Boron/% basic N of the lubricating oil composition is situated around 3.0.