Patent ID: 9169897
Filing Date: 2015-10-27
Classification: C08K,F16G

Abstract:
1. A friction drive belt comprising: a substantially flat adhesion rubber layer including cord members; a compression rubber layer connected to the adhesion rubber layer on one side and including V ribs extending opposite from said adhesion rubber layer, wherein the composition of the compression rubber layer is uniform at all points from the surface of the V ribs to the adhesion rubber layer and includes: EPDM as the raw rubber material forming the compression layer, short fibers and carbon black both scattered within the EPDM so as to be exposed at a surface of at least a contact part of the compression rubber layer of a rubber belt body with a pulley, wherein the short fibers include at least one type of short fibers among short polyvinyl alcohol fibers, short polyacetal fibers, and short polypropylene fibers having a main chain which does not contain an aromatic compound and having an initial tensile resistance of equal to or greater than 100 cN/dtex, the carbon black has an average particle diameter of between about 49-500 nm and contains at least one of carbon black GPF, carbon black SRF, and carbon black MT having an iodine absorption of equal to or less than 40 g/Kg, and/or a specific surface area of equal to or less than 40 m an amount of the short fibers blended into 100 parts by mass of a raw rubber material of a rubber composition forming the contact part with the pulley is about 5-30 parts by mass, and a sum of amounts of the carbon black GPF, the carbon black SRF, and the carbon black MT contained in 100 parts by mass of the raw rubber material of the rubber composition forming the contact part with the pulley is about 40-80 parts by mass.