Non-asbestos friction materials
AssigneeNisshinbo Industries, Inc.
InventorsTomoki Nakamura, Takeo Nagata, Kazuhiro Takeuchi, Mitsuru Kobayashi
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Abstract
A non-asbestos friction material made by molding and curing a composition comprised of a fibrous base, a binder, and a filler has a 100 Hz vibration damping factor (tan δ) at 300° C. minus tan δ at 50° C. value of at least −0.030. The binder may be a rubber-modified high-ortho phenolic resin, a resin mixture of a rubber-modified high-ortho phenolic resin and a rubber-modified phenolic resin, or a resin mixture of two or more rubber-modified phenolic resins. The friction material has an excellent and long-lasting noise performance, and good wear resistance, functional stability, and fade resistance. The rapid curability of the composition enables a short molding cycle.
Claims28
A non-asbestos friction material made by providing a binder which is a rubber-modified high-ortho phenolic resin having an ortho bond to para bond ratio at methylene linkages therein of at least 1.0 and subsequently molding and curing a composition comprising a fibrous base, said binder, and a filler, wherein the amount of the fibrous base is 1 to 50% by weight, the amount of the binder is 3 to 30% by weight, and the amount of the filler is 20-96% by weight, based on the overall weight of the friction material.
A non-asbestos friction material made by providing a binder which is a resin mixture of a rubber-modified high-ortho phenolic resin having an ortho bond to para bond ratio at methylene linkages therein of a least 1.0 and a rubber-modified phenolic resin having an ortho bond to para bond ratio at methylene linkages therein of less than 1.0 and subsequently molding and curing a composition comprising a fibrous base, said binder, and a filler, wherein the amount of the fibrous base is 1 to 50% by weight, the amount of the binder is 3 to 30% by weight, and the amount of the filler is 20-96% by weight, based on the overall weight of the friction material.
The non-asbestos friction material made by providing a binder which is a resin mixture of an acrylic rubber-modified phenolic resin and a nitrile rubber-modified phenolic resin mixed in a weight ratio of from 1:10 to 3:2 and wherein the resin mixture has a rubber content of at least 10% by weight and subsequently molding and curing a composition comprising a fibrous base, said binder, and a filler, wherein the amount of the fibrous base is 1 to 50% by weight, the amount of the binder is 3 to 30% by weight, and the amount of the filler is 20-96% by weight, based on the overall weight of the friction material.
A non-asbestos friction material made by providing a binder which is a rubber-modified high-ortho phenolic resin having an ortho bond to para bond ratio at methylene linkages therein of at least 1.0 and subsequently molding and curing a composition comprising a fibrous base, said binder, and a filler, wherein the amount of the fibrous base is 1 to 50% by weight, the amount of the binder is 3 to 30% by weight, and the amount of the filler is 20-96% by weight, based on the overall weight of the friction material, wherein the friction material has a 100 Hz vibration damping factor (tan δ) at 300° C. minus tan δ at 50° C. value of at least −0.030.
Dependencies are inferred from the claim text.