HIGH TEMPERATURE LUBRICANT COMPOSITION

摘要

us0220955synthetic lubricanrs based on a 100% polyol ester composition suitable for use in high temperature static chain oil applications is provided. The lubricant includes a base stock based on a polyol ester that i s the reaction product of a neopentyl polyol including a major proportion of dipentaerythritol and a mixture of C5 to C12 carboxylic acids. The preferred carboxylic acid mixture includes heptanic (C7) acid, caprylic/capric (C8-10) acid and isononanoic (3, 5, 5-trimethylhexanoic) acid (iso-C9). The polyol base stock is mixed with an additive package that includes a viscosity index improver (tackifier), antioxidants, extreme pressure/antiwear agents and a corrosion inhibitor. The addditive package may be added in up to about 20 percent by weight of the lubricant to provide a viscosity of the lubricant a t 40 ~C of 270-330 cSt and at 100 ~C of no less than about 25.0 cSt.