A process for producing dihydric phenols is disclosed. The process comprises reacting a phenol with a ketone peroxide or a combination of a ketone and hydrogen peroxide in the presence of a compound having at least one P-S bond. Dihydric phenols can be produced in high yield without requiring neutralization after the reaction.
LUBRICANT COMPOSITION AND DRIVING FORCE TRANSMITTING SYSTEM USING SAME
申请人:Nippon Oil Corporation
公开号:EP1816183A1
公开(公告)日:2007-08-08
The invention provides a lubricating oil composition comprising a lubricating base oil, a phosphorus compound and at least one organic acid salt selected from among alkaline earth metal sulfonates, alkaline earth metal phenates and alkaline earth metal salicylates, wherein the contents of the phosphorus compound and organic acid salt satisfy the conditions represented by the following formulas (1) to (3). In formulas (1)-(3), W(P) represents the content of phosphorus compound, in terms of phosphorus element, based on the total amount of the lubricating oil composition, and W(M) represents the content of organic acid salt content, in terms of alkaline earth metal elements, based on the total amount of the lubricating oil composition.
A lubricating oil composition which comprises (A) a base oil, (B) calcium salicylate having a base number of 50 to 300 mgKOH/g in an amount of 0.005 to 0.07 percent by mass in terms of calcium, (C) an SP type extreme pressure additive in an amount of 0.005 to 0.07 percent by mass in terms of phosphorous, (D) a specific succinimide compound in an amount of 0.1 to 6 percent by mass, and (E) a boron-containing ashless dispersant in an amount of 0.001 to 0.05 percent by mass in terms of boron, based on the total mass of the composition. The lubricating oil composition can prevent pitching of a transmission, resulting in the extended fatigue life thereof, and exhibits excellent and long-lasting anti-shudder properties.
A transmission fluid composition for automobiles comprises a lubricating base oil, (A) an oil-soluble metal salt overbased with a specific alkaline earth metal borate, and (B) a sulfur-containing extreme pressure additive. The transmission fluid can enhance a metallic friction coefficient, leading to the achievement of improved transmission torque.