Invention Grant
US08278255B2 Unexpected shear stability benefits of synthetic oils and viscosity modifier combinations 有权
合成油和粘度调节剂组合意外的剪切稳定性好处

  • Patent Title: Unexpected shear stability benefits of synthetic oils and viscosity modifier combinations
  • Patent Title (中): 合成油和粘度调节剂组合意外的剪切稳定性好处
  • Application No.: US12383812
    Application Date: 2009-03-27
  • Publication No.: US08278255B2
    Publication Date: 2012-10-02
  • Inventor: David G. L. Holt
  • Applicant: David G. L. Holt
  • Agent Robert A. Migliorini
  • Main IPC: C10M145/14
  • IPC: C10M145/14 C10M169/04 C10G71/00
Unexpected shear stability benefits of synthetic oils and viscosity modifier combinations
Abstract:
In one embodiment, a lubricating oil with favorable shear stability is disclosed. The lubricating oil comprising a major amount of base stock selected from the group consisting of Group II, Group III, Group IV, Group V, and any combination thereof, a viscosity index improver comprising a polymethacrylate with a permanent shear stability index of less than 45 defined by ASTM 5621 with 10 percent polymer in a Group I mineral oil, an antioxidant additive and a corrosion additive. In a second embodiment a method of improving shear stability is disclosed. In a third embodiment, a method of blending an oil to provide improved shear stability and favorable viscosity index is disclosed.
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