| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluorinated grease having low torque levels at -40°C or lower, especially lower than those of linear perfluoropolyether oil-based greases of prior art. SOLUTION: The fluorinated grease comprises (A) 1-50 wt.% of a thickening agent and (B) two perfluoropolyethers (B1) and (B2); wherein the perfluoroether (B1) consists of 0.1-100 wt.% of a compound of the structural formula: X<SB>1</SB>-O(CF<SB>2</SB>O)<SB>n</SB>(CF<SB>2</SB>CF<SB>2</SB>O)<SB>m</SB>(CF<SB>2</SB>CF<SB>2</SB>CF<SB>2</SB>O)<SB>p</SB>(CF<SB>2</SB>CF<SB>2</SB>CF<SB>2</SB>CF<SB>2</SB>O)<SB>q</SB>-X<SB>2</SB>(wherein, X<SB>1</SB>and X<SB>2</SB>are each of the formula: -(CF<SB>2</SB>)<SB>z</SB>CF<SB>3</SB>), has a number-average molecular weight of 1,000-10,000 and is lower than 20 cSt in dynamic viscosity at 40°C, and the perfluoroether (B2) consists of 99.9-0 wt.% of a compound of (CFXO) type with recurring units: -CF<SB>2</SB>CF<SB>2</SB>O-, -C<SB>3</SB>F<SB>6</SB>O-, -CF(CF<SB>3</SB>)CF<SB>2</SB>O- and -CF<SB>2</SB>CF(CF<SB>3</SB>)O- distributed statistically along the skeleton and is higher than 15 cSt in dynamic viscosity at 40°C. COPYRIGHT: (C)2007,JPO&INPIT |
