C - Chemistry – Metallurgy – 10 – M
Patent
C - Chemistry, Metallurgy
10
M
C10M 105/04 (2006.01) C10M 169/04 (2006.01)
Patent
CA 2166523
The fluids have an oil-soluble boron content of about 0.001 to about 0.1 %, an oil-soluble phosphorus content of about 0.005 to about 0.2%, and either no metal additive content or an oil-soluble metal content as one or more metal-containing additives of no more than about 100 ppm. Included in the fluids are: (a) at least 70 wt% of hydrogenated poly-.alpha.-olefin oligomer fluid with a viscosity in the range of 2-6 cSt at 100°C; (b) 2-20 wt% of acrylic viscosity index improver; (c) 4-25 wt% of oil-soluble dialkyl ester of a C4 to C14 .alpha.,.omega.-dicarboxylic acid with a pour point of -45°C or lower; (d) ashless dispersant; (e) friction modifier; and (f) ail-soluble inhibitors. The components are such that the fluid has (i) a KV of at least 6.8 cSt at 100°C, (ii) a BV of 15,000 cP or less at -40°C, (iii) a KV at 100°C of at least 6.0 cSt after 4 hours and at least 5.0 cSt after 20 hours in the Volkswagen * taper roller bearing shear stability test. The fluids possess other excellent performance properties. * Trade-mark
Smith David W.
Srinivasan Sanjay
Corporation Ethyl
Macrae & Co.
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