| 摘要 |
PROBLEM TO BE SOLVED: To provide a laminate having an unevenly distributed fibrillated fiber, also having not only excellent interlayer strength but also excellent balance of lubrication characteristics and friction characteristics, and achieving the improvement of clutch performance. SOLUTION: The laminate having the unevenly distributed fibrillated fiber is obtained by laminating a nonwoven fabric containing the fibrillated fiber with a fabric by a high-pressure hydroentanglement. Preferably, the fibrillated fiber of the nonwoven fabric is selected from a wholly aromatic polyamide fiber and an acrylic fiber, and the fiber constituting the fabric is selected from a wholly aromatic polyamide fiber, a cellulose fiber and an acrylic fiber. The laminate having the unevenly distributed fibrillated fiber is a nonwoven fabric having a two-layer structure constituted of the surface layer part consisting essentially of a highly fibrillated fiber, and partially three-dimensionally entangled with the fabric fiber at the lower part in the vertical direction, and the back surface constituted of a slightly fibrillated fiber. The laminate is usable as a friction material in a driving system of an automobile. COPYRIGHT: (C)2011,JPO&INPIT
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