Wet friction material

Abstract

The invention provides a wet friction material having high friction coefficient, excellent compression fatigue property and positive gradient of a μ-V property. The wet friction material contains a paper base material and a binder, in which the binder contains a cured material of a liquid resin composition obtained by mixing a hydrolyzed solution of a silane coupling agent represented by the following formula (1) and a resol-type phenol resin, and a weight ratio (S/R) between respective non-volatile components of the hydrolyzed solution (S) of the silane coupling agent and the resol-type phenol resin (R) is in the range of from 80/20 to 20/80: (X)(R1)nSi(OR2)3-n (1), in which X represents an alkylamino group having a primary amine at a terminal; R1 and R2 each independently represent an alkyl group having from 1 to 3 carbon atoms; and n represents an integer of 0 or 1.

Dependencies are inferred from the claim text.