LUBRICANT COMPOSITION HAVING IMPROVED NON-NEWTONIAN VISCOMETRICS

摘要

The lubricant composition with improved non-Newtonian viscometrics comprises at least 85% by weight of base oil and 1 to 15% by weight of lubricant additive. The additive itself comprises 10 to 80% by weight of diluent oil and 30 to 80% by weight of random co-polymeric viscosity index improver. Viscosity index improvers are free radical polymerization products of at least 5 to 15% by weight of methyl methacrylate and 5 to 95% by weight of C ₈ -C ₁₀ alkyl (meth) acrylate. The additive is formed using a method comprising providing diluent oil, methyl methacrylate, C ₈ -C ₁₀ alkyl (meth) acrylate, and a free radical initiator. The method also includes flowing diluent oil into the reactor, flowing methyl methacrylate and C ₈ -C ₁₀ alkyl (meth) acrylate into the reactor independently of the free radical initiator and flowing the free radical initiator into the reactor. It includes.