Patent ID: 7435198

Claim:
A toothed belt comprising a plurality of teeth portions on at least one surface of a belt body rubber layer and a treated tooth cloth coated on the surface of said teeth portions, wherein said belt body rubber layer comprises a plurality of core strands buried in the longitudinal direction of the belt, wherein further said treated tooth cloth comprises a first layer which comprises a canvas impregnated with rubber, a second rubber layer which is formed on a surface side of said first layer and is in direct contact with a toothed pulley, and a third rubber layer which is formed on the back side of the first layer and adhered to said belt body rubber layer, wherein further the rubber in said first layer consists of a rubber composition comprising polytetrafluoroethylene, phenol resin, titanium oxide, a potassium titanate fiber and zinc methacrylate in a mixture obtained by formulating a hydrogenated nitrile rubber and a polymer alloy in which zinc methacrylate is finely distributed in the hydrogenated nitrile rubber in a range of parts by weight of 95:5 to 60:40, said rubber composition having an increased crosslink density by increasing the amount of crosslinking agent as compared with said third rubber layer, and wherein further said hydrogenated nitrile rubber has an iodine value of 4 to 56 g and said polymer alloy has a Mooney value of at least 70 at 100° C.