Patent ID: 6797678
Filing Date: 2004-09-28
Classification: C10M

Abstract:
A method for transmitting automatically in an automobile transmission selected from the group consisting of traction drive continuous variable transmissions and push-belt type continuous variable transmissions, which method comprises adding an additive to traction drive fluid wherein the additive is obtainable by heating (A) at least one ester selected from an acidic phosphate ester and a phosphite ester represented by the general formula (I): wherein A represents a hydrogen atom or a hydroxyl group, m is 0 or 1, when m is 0, A is a hydroxyl group, and when m is 1, A is a hydrogen atom or a hydroxyl group, R1 and R2 each independently represent a hydrogen atom, or a hydrocarbon group having a 1 to 18 carbon atoms that contains at least one selected from an oxygen atom and a sulfur atom, R1 and R1 may be the same or different, but both R1 and R2 are not simultaneously hydrogen atoms;and (B) a succinimide dispersant containing boron at 120 to 150Â° C. for 5 hours or more.