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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 (46-80, Sakinohama, Oaza Nakabaru, Tobata-ku, Kitakyushu-sh, Fukuoka 03, 〒8048503, JP)
倉富 格 (〒03 福岡県北九州市戸畑区大字中原先の浜46番地の80 新日鐵化学株式会社内 Fukuoka, 〒8048503, JP)
Application Number:
JP2011/058226
Publication Date:
October 13, 2011
Filing Date:
March 31, 2011
Export Citation:
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Assignee:
NIPPON STEEL CHEMICAL CO., LTD. (14-1, Sotokanda 4-chome Chiyoda-k, Tokyo 21, 〒1010021, JP)
新日鐵化学株式会社 (〒21 東京都千代田区外神田四丁目14番1号 Tokyo, 〒1010021, JP)
KURATOMI Tadashi (46-80, Sakinohama, Oaza Nakabaru, Tobata-ku, Kitakyushu-sh, Fukuoka 03, 〒8048503, JP)
International Classes:
C10M105/38; C10N20/02; C10N40/02; C10N40/04; C10N40/08; C10N40/18
Domestic Patent References:
2007-10-18
Foreign References:
JP2005154726A2005-06-16
JPH03128991A1991-05-31
JPH07224289A1995-08-22
JP2008214380A2008-09-18
JP2000336383A2000-12-05
JPH09316029A1997-12-09
JP2008069234A2008-03-27
JP2007039496A2007-02-15
Other References:
See also references of EP 2554640A1
Attorney, Agent or Firm:
SASAKI Kazuya et al. (5th Floor, TKK Nishishinbashi Bldg. 11-5, Nishi-shinbashi 2-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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Claims: