Patent ID: 6331358
Filing Date: 2001-12-18
Classification: D21H,F16D,Y10T

Abstract:
A wet friction material comprising:a fiber base material;a filler;a friction adjusting agent; anda thermosetting resin;wherein said wet friction material is prepared by mixing a paper-forming solid thermosetting resin with a fiber base material as at least a part of a filler to form a paper, impregnating said paper with a liquid thermosetting resin, and applying heat to said paper so as to be hardened, wherein at least a part of said liquid thermosetting resin is made of a silicone resin represented by the following average composition formula, and the amount of trifunctional unit monomers, RSiO.sub.3/2 in which R represents a monovalent hydrocarbon group, in monomers constituting said silicone resin is from 40 to 100 mol %:(R.sup.1).sub.a (OR.sup.2).sub.b SiO.sub.(4-a-b)/2wherein R.sup.1 represents a monovalent hydrocarbon group, R.sup.2 represents a hydrogen atom or C.sub.1-10 organic group; and the suffixes a and b represent a positive number satisfying the relationships 0.2.ltoreq.a.ltoreq.1.8 and 0<b.ltoreq.1.9.