Abstract: Sizing compositions comprising a combination of several adhesive agents capable of being cross-linked, an acrylic polymer and a coupling agent, are used to treat glass fibers in order to provide improved plastic reinforcing fibers especially suited to use in sheet molding compounds whereby molded articles, particularly large pieces formed therefrom, will have improved reinforcement and surface characteristics.

Abstract: A glass fiber sizing composition for the reinforcement of resin matrices which comprises one or more adhesive agents, non-ionic lubricants, organo-silanes, and cationic lubricants as well as a coadhesive such as gelatin, another silane or some sort of glass-resin binding agent and demineralized water as a complement. The organo-silanes are from the group comprising the organo-silanes containing an organic chain of the polyazamide type and the organo-silanes whose organic chain contains at least one phenyl radical and at least two secondary or tertiary amine groups. The addition of the organo-silanes to the sizing composition improves the tensile strength of the sized strands. These organo-silanes are good organic glass-resin binding agents and their presence decreases the risk of rupture of the strands during the winding operation.

Abstract: Aqueous compositions for the coating of glass fibers used particularly for textiles, a method of applying these compositions to the fibers, and the fibers themselves are disclosed. The aqueous compositions comprise at least one starch, a non-ionic lubricant, a cationic lubricant, emulsifier and at least one organo-silane from the group made up of the organo-silanes comprising an organic chain of the polyazamide type and of the organo-silanes whose organic chain contains at least one phenyl radical and at least one secondary or tertiary amine group.

Abstract: Sizing compositions for coating glass fibers as well as the coated fibers in which the compositions are constituted essentially of two film forming agents and of two lubricants. One film forming agent is a modified starch in which almost the entire mass of starch granules is burst. The second is an acrylic polymer, preferably a water-soluble one. One lubricant is non-ionic and preferably a mineral oil. The second is a polyethylene wax in the form of an aqueous emulsion containing a cationic emulsifier.