Patent ID: 8748509
Filing Date: 2014-06-10
Classification: C08G,C08L,F16D

Abstract:
1. A friction material comprising a resin composition, the resin composition comprising: 5 to 30% by mass of an aromatic imide oligomer having an addition-reactive group at an end thereof; fiber; and inorganic filler; wherein, the addition-reactive group is a reactive group selected from the group consisting of a phenylethynyl group, an acetylene group, a nadic group, and a maleimide group, a tetracarboxylic acid component for producing the aromatic imide oligomer includes at least one tetracarboxylic acid dianhydride selected from the group consisting of: 2,3,3′,4′-biphenyltetracarboxylic acid dianhydride, 2,2′,3,3′-biphenyltetracarboxylic acid dianhydride, 3,3′,4,4′-biphenyltetracarboxylic acid dianhydride, and 3,3′,4,4′-benzophenone tetracarboxylic acid dianhydride, a diamine component for producing the aromatic imide oligomer includes at least two aromatic diamines selected from the group consisting of: 1,3-diaminobenzene, 1,3-bis(4-aminophenoxy)benzene, 3,4′-diaminodiphenyl ether, 4,4′-diaminodiphenyl ether, and 2,2′-bis(trifluoromethyl)benzidine, and wherein, the repeating number average of repeating units of the aromatic imide oligomer is from 0.5 to 20, and the aromatic imide oligomer has a melt viscosity at 280° C. of 1 to 15 poise.