Patent ID: 8859081

Claim:
A toothed belt comprising: physical properties for maintaining the belt in an oil wet condition in a timing system, including a body made of a first elastomeric material formed by a mixture of one or more copolymers, obtained from a dien monomer and a nitrile group-containing monomer, and a plurality of teeth; said teeth being coated by a fabric; said fabric being covered by a resistant layer, said resistant layer totally adhering to the fabric and forming in use the working surface of the toothed belt and wherein said resistant layer comprises a vulcanisation agent and more than 85% of a second elastomeric material formed by at least one copolymer modified with an unsaturated carboxylic acid salt and obtained from a dien monomer and a nitrile group-containing monomer, wherein said first elastomeric material has an unsaturation level lower than 1%, wherein said second elastomeric material is formed by a mixture of one or more copolymers, obtained from a dien monomer and a nitrile-group containing monomer in which the nitrile group-containing monomers are in a percentage in the range between 33% and 49% in weight with respect to total final copolymers, wherein said resistant layer contains no anti-friction material, and, wherein said resistant layer consists essentially of said second elastomeric material.