Title:
LUBRICATING OIL COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2011/125842
Kind Code:
A1
Abstract:
Disclosed are a lubricating oil base oil with excellent endurance and low torque properties, and also a lubricating oil composition suitable for fluid dynamic bearings, porous oil-retaining bearings and dynamic porous oil-retaining bearings used in information apparatus-related miniature spindle motor bearings. The main component of the lubricating oil base oil and lubricating oil composition using the lubricating base oil is a diester as shown in Figure 1. In the formula, R1 and R2 represent an independent 1-ethyl pentyl group, n-heptyl group or n-hexyl group, and; where (A) R1 and R2 are both an n-heptyl group or an n-hexyl group; (B) either R1 or R2 are a 1-ethyl pentyl group; (C) both R1 and R2 are a 1-ethyl pentyl group; the molar ratio thereof is within the range A:B:C 25-65:30-50:3-25.
Inventors:
KURATOMI TADASHI (JP)
NAGANO KATSUMI (JP)
NAGANO KATSUMI (JP)
Application Number:
PCT/JP2011/058226
Publication Date:
October 13, 2011
Filing Date:
March 31, 2011
Export Citation:
Assignee:
NIPPON STEEL CHEMICAL CO (JP)
KURATOMI TADASHI (JP)
NAGANO KATSUMI (JP)
KURATOMI TADASHI (JP)
NAGANO KATSUMI (JP)
International Classes:
C10M105/38; C10N20/02; C10N40/02; C10N40/04; C10N40/08; C10N40/18
Domestic Patent References:
| WO2007116725A1 | 2007-10-18 |
Foreign References:
| JP2005154726A | 2005-06-16 | |||
| JPH03128991A | 1991-05-31 | |||
| JPH07224289A | 1995-08-22 | |||
| JP2008214380A | 2008-09-18 | |||
| JP2000336383A | 2000-12-05 | |||
| JPH09316029A | 1997-12-09 | |||
| JP2008069234A | 2008-03-27 | |||
| JP2007039496A | 2007-02-15 |
Other References:
See also references of EP 2554640A4
Attorney, Agent or Firm:
SASAKI Kazuya et al. (JP)
Kazuya Sasaki (JP)
Kazuya Sasaki (JP)
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Claims:
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