| abstract |
The invention relates to a reinforcing material, constituted by volumized fibers that are combined in the form of a mat or a lay. The volumized fibers differ with respect to material or degree of volumization. Alternatively, or additionally, non-volumized fibers are used. The method for producing the inventive reinforcing material is characterized in that in a roving, yarn or weakly twisted yarn continuous monofilaments, arranged in parallel and havin g a high modulus of elasticity, are expanded with an aqueous binder-containing suspension of particles of the unexpanded precursor of the plastic hollow spheres with a particle size of 5 to 10 .mu.m or spread apart and the interstices so formed are substantially filled with the particles. The material so obtained is subjected to the temperature required for the expansion of the precursor particles for the required duration and is furthe r processed to a mat using differently expanded or unexpanded rovings, yarns o r weakly twisted yarns and/or using rovings, yarns or weakly twisted yarns tha t consist of other materials. The reinforcing material is used for producing light laminates from duroplastic material that are especially strong as compared to known laminates. |