| abstract |
A roving laid flat of unitary metal, mineral or synthetic filaments is treated with a powder, whose grain size is equal to the diameter of the filaments, of a plastic material chosen either from the group of thermosetting polyers including the epoxides, the phenolics, the polyesters with terminal groups -COOH, the polyimides, the acrylics and the polyurethanes, or prepolymerized polyamides modified by diamines, polyolefins modified by maleic anhydride or acrylic acid, partially hydrolized EVA copolymers, the E-VA-maleic anhydride terpolymers and eva copolymers grafted by the acrylic radical, then the powder charged rovings are coated by a thermoplastic polymer, such as polyamides, copolyamides and linear polyesters, the material thus obtained being placed in a mold under pressure and at a temperature not exceeding 170 DEG C. |