US2001044389A1PendingUtilityA1

Lubricant compositions for transmissions

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Assignee: NIPPON MITSUBISHI OIL CORPPriority: Mar 21, 2000Filed: Mar 21, 2001Published: Nov 22, 2001
Est. expiryMar 21, 2020(expired)· nominal 20-yr term from priority
Inventors:Kenichi KomiyaAkira YaguchiOsamu Kurosawa
C10N 2030/02C10N 2030/68C10M 2219/046C10M 2215/04C10M 2207/026C10M 2215/28C10N 2060/14C10N 2030/06C10M 2215/223C10M 2223/049C10N 2010/04C10M 2209/084C10M 2215/042C10N 2040/042C10M 169/044C10M 2215/064
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Claims

Abstract

Transmission lubricant compositions comprise a mineral oil as a base oil of which % CP and % CA defined in ASTM D 3238 are 70 or more and 3 or less, respectively, a viscosity index improver, and a friction modifier. The transmission lubricant compositions have excellent low temperature fluidity, shear stability, and durability of anti-shudder properties and thus can be used for extended periods of time.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A transmission lubricant composition which comprises a mineral oil as a base oil of which % CP and % C A  defined in ASTM D 3238 are 70 or more and 3 or less, respectively, a viscosity index improver, and a friction modifier.  
     
     
         2 . The transmission lubricant composition according to    claim 1    wherein said viscosity index improver is selected from the group consisting of various polymethacrylates.  
     
     
         3 . The transmission lubricant composition according to    claim 2    wherein said polymethacrylates have a weight-average molecular weight of 10,000 to 200,000.  
     
     
         4 . The transmission lubricant composition according to    claim 1    wherein said mineral oil has a kinematic viscosity at 100° C. of 1 to 10 mm 2 /s.  
     
     
         5 . The transmission lubricant composition according to    claim 1    wherein said viscosity index improver is selected from the group consisting of dispersion type viscosity index improvers.

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