Abstract: A power transmission belt has a belt body, a plurality of cords embedded in the belt body, a back, and a plurality of teeth. The back and/or the teeth are covered with a covering material that is either a woven fabric or a knitted fabric. At least 60% by weight of the total weight of the belt body is an elastomeric material formed of a mixture of one or more copolymers obtained from a diene monomer and a monomer containing nitrile groups that are modified with a salt of an unsaturated carboxylic acid.

Abstract: A power transmission belt having a body made of a first elastomeric material, a plurality of cords embedded in the body of the belt, a back and a plurality of ribs or teeth. The back or the ribs or the teeth are covered by a covering material chosen from the group composed of woven fabric and knitted fabric. The covering material includes elastolefin fibres, and preferably at least one elastolefin thread.

Abstract: CVT belts have a body extending over the entire section of the belt and have cords made with carbon or PBO fibres and having a central Axis I along their length. The body is made from a single compound-of a nitrile group-containing copolymer rubber as main elastomer. The belt has a top toothing, an axis A orthogonal to said central axis and extending at a point where the thickness of the belt is the highest, a cross-section defined by a section plane orthogonal to said central axis I and taken at the axis A. The cross-section has a trapezoidal shape, a top side defining a top width, a bottom side defining a bottom width, and two lateral sides.

Abstract: Power transmission belts are disclosed that have a body made of a first elastomeric material, a plurality of cords embedded in the body of the belt, a back and a plurality of ribs or teeth. The back, ribs, or the teeth are covered by a covering material of woven fabric, knitted fabric, and non-woven fabric, which is treated with a treatment composition that includes polyurethane, polytetrafluoroethylene, and polycarbodiimide.

Abstract: Power transmission belts described herein have a nitrile group-containing copolymer rubber that has an acrylonitrile unit, a monomer unit of ?,?-ethylenically unsaturated nitrile monomer other than acrylonitrile, and a conjugated diene monomer unit. The nitrile group-containing copolymer rubber has an iodine value of 120 or less a total of the acrylonitrile unit and the monomer unit of ?,?-ethylenically unsaturated nitrile monomer other than acrylonitrile is 1 to 50% by weight in the total monomer unit, and a weight ratio of the acrylonitrile unit and the monomer unit of ?,?-ethylenically unsaturated nitrile monomer other than acrylonitrile is 10:90 to 90:10.

Abstract: Power transmission belts described herein have a nitrile group-containing copolymer rubber that has an acrylonitrile unit, a monomer unit of ?,?-ethylenically unsaturated nitrile monomer other than acrylonitrile, and a conjugated diene monomer unit. The nitrile group-containing copolymer rubber has an iodine value of 120 or less a total of the acrylonitrile unit and the monomer unit of ?,?-ethylenically unsaturated nitrile monomer other than acrylonitrile is 1 to 50% by weight in the total monomer unit, and a weight ratio of the acrylonitrile unit and the monomer unit of ?,?-ethylenically unsaturated nitrile monomer other than acrylonitrile is 10:90 to 90:10.

Abstract: A power transmission belt having a body made of a first elastomeric material, a plurality of cords embedded in the body of the belt, a back and a plurality of ribs or teeth. The back or the ribs or the teeth are covered by a covering material chosen from the group composed of woven fabric and knitted fabric. The covering material includes elastolefin fibres, and preferably at least one elastolefin thread.

Abstract: There is described a belt comprising a body made of a first elastomeric material, in which a plurality of longitudinal filiform resistant inserts is embedded, and a working surface coated by a coating fabric, advantageously the working surface consists of a toothing. The first elastomeric material comprises fibers which extend in a direction substantially perpendicular to the resistant inserts and substantially parallel to a surface defined by the axes of the resistant inserts.

Abstract: The invention relates to an elastomeric composition comprising a branched polymer obtained from a polymer selected from the group consisting of NBR, HNBR, XHNBR, EP(D)M, and maleized EPDM and from a compound adapted to form a bond at a bond of the polymer to form a side chain. This compound comprises a group Y comprising a perfluoroalkyl functional group and a functional group adapted to react with the double bond. Preferably, Y=F(CF2CF2)m/wherein m is in the range between 2 and 20; R is selected from the group consisting of a double bond C?C, a triple bond C?C, a functional alcoholic, carboxylic, esteric, acrylic, methacrylic group. The invention also relates to the use of a composition as a body compound for a drive belt and to the use thereof in an oil bath.

Abstract: There is described a belt comprising a body made of a first elastomeric material, in which a plurality of longitudinal filiform resistant inserts is embedded, and a working surface coated by a coating fabric, advantageously the working surface consists of a toothing. The first elastomeric material comprises fibres which extend in a direction substantially perpendicular to the resistant inserts and substantially parallel to a surface defined by the axes of the resistant inserts.

Abstract: The invention relates to an elastomeric composition comprising a branched polymer obtained from a polymer selected from the group consisting of NBR, HNBR, XHNBR, EP(D)M, and maleized EPDM and from a compound adapted to form a bond at a bond of the polymer to form a side chain. This compound comprises a group Y comprising a perfluoroalkyl functional group and a functional group adapted to react with the double bond. Preferably, Y=F(CF2CF2)m/wherein m is in the range between 2 and 20; R is selected from the group consisting of a double bond C?C, a triple bond C?C, a functional alcoholic, carboxylic, esteric, acrylic, methacrylic group. The invention also relates to the use of a composition as a body compound for a drive belt and to the use thereof in an oil bath.