| 摘要 |
PROBLEM TO BE SOLVED: To provide a frictional material with a coating film having high initial frictional coefficient, and keeping constant frictional coefficient with age. SOLUTION: The coating film including rubber and/or resin (preferably rubber), and silica fine particles of average particle size of 1-300nm is formed on a surface of a base material for this frictional material with the coating film. In this manufacturing method of the frictional material with the coating film comprises applying a mixture prepared by mixing at least a rubber latex and/or resin solution (preferably rubber latex), and colloidal silica, to the surface of the base material for the frictional material, and drying the same to form the coating film. The drying is preferably performed at a temperature of 80°C or less. The average particle size of the silica in the colloidal silica is preferably 1-300nm. The silica of 10-100 pt. wt. as a solid content is preferably included in the rubber solid content of 100 pt. wt. in the mixture. A thickness of the coating film is preferably 50-500μm. COPYRIGHT: (C)2006,JPO&NCIPI
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