Abstract: Fiber for reinforcing rubber products, which comprises fiber coated with a coating film formed by a treating agent, wherein the treating agent comprises a rubber latex containing at least a vinylpyridine/styrene/butadiene terpolymer, a latex of an acrylonitrile/butadiene/styrene terpolymer, and a water-soluble condensate of resorcinol and formaldehyde.

Abstract: The invention is aimed at a method for the manufacture of a longitudinal reinforcing element based on glass fibers which is intended to be incorporated in a profiled article based on thermoplastic elastomer.

Abstract: A method for the production of a multifilament carbon fibre-based longitudinal reinforcing element, designed to be incorporated in a rubber-based item. Said method comprises the following steps, whereby untwisted carbon fibres are plunged into an impregnating bath contained a solution of resorcinol-formaldehyde resin and rubber latex, the impregnated fibres are then dried and the dried fibres are subsequently twisted. The inventive method is characterised by the fact that it also comprises a step, during the impregnation step, consisting in opening out the carbon fibres by spreading out the constituent filaments thereof in such a way that each fibre has an increased surface area on which the impregnation can be performed.