Patent ID: 8778859

Claim:
A gas compressor and a lubricant therein wherein the lubricant comprises; a) at least one oil of lubricating viscosity, b) from about 0.1 to about 5 weight percent of a polymeric additive having a weight average molecular weight from 70,000 to 350,000 amu and soluble in said lubricant at those weight percentages and wherein said polymeric additive is selected from the group consisting of a polyisobutylene, other polyolefin homopolymer and polyolefin copolymer, c) optionally lubricant additives selected from antioxidants, friction modifiers, dispersants, detergents, basicity reserve agents, dyes, and corrosion inhibitors, and d) further including a gas selected from the group consisting of, carbon dioxide, ammonia, and air within said compressor.