| abstract |
The present invention provides an environmentally friendly low noise grease which is sealed in a small motor bearing used for a motor bearing for home appliances such as an air conditioner and a motor bearing for information equipment such as a hard disk drive to reduce the rotational noise of the motor. [Solution] A grease composition comprising 5 to 20% by weight of a thickener and 95 to 80% by weight of a base oil; Lithium soap synthesized from lithium hydroxide and a higher fatty acid having 10 to 20 carbon atoms and / or a higher hydroxy fatty acid having 10 or more carbon atoms having one or more hydroxyl groups as a thickener, and the following general formula Polymer ester oil in which 8 or more ester groups are arranged in a comb-tooth shape on one side of an oil chain molecule composed of 8 or more carbon atoms represented by 1 (a) [Chemical formula 5] (In the formula, R 1 , R 2 , R 3 and R 4 are all alkyl groups, and are integers of x ≧ 2 and y ≧ 2.) And a base oil viscosity (40 ° C.) of 25 to 80 mm 2 / s, a low noise type lithium grease composition for enclosing a small motor bearing. |