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Fibers coated with polymer are prepared by adding the polymer to a fiber material, typically cellulose pulp, and subjecting the fiber material with the added polymer to impact of grinding forces in a defibrator, typically a hammer mill. The resulting fibers are very efficiently coated with the polym

Fibers coated with polymer are prepared by adding the polymer to a fiber material, typically cellulose pulp, and subjecting the fiber material with the added polymer to impact of grinding forces in a defibrator, typically a hammer mill. The resulting fibers are very efficiently coated with the polymer and are suitable as binder fibers in fibrous materials consisting completely or partially of the coated fibers bonded through the polymer, and as reinforcing fibers in fiber-reinforced cement products. The polymer is preferably applied as a hot melt, and the defibration is performed immediately after the application.

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A method of making fibers coated with a polymer, comprising adding a thermoplastic polymer which becomes sticky at temperatures from about 75°C. to about 400°C. to a fiber material, in the presence of a coupling agent selected from the group consisting of metal oxide acylates, silanes, and metal com

A method of making fibers coated with a polymer, comprising adding a thermoplastic polymer which becomes sticky at temperatures from about 75°C. to about 400°C. to a fiber material, in the presence of a coupling agent selected from the group consisting of metal oxide acylates, silanes, and metal complexes, exposing the fiber material and the polymer to impact or grinding forces in a defibrator so that sufficient heat is generated to cause coating of the fibers with the polymer and so that each single fiber is individually coated, and recovering substantially individual polymer coated fibers which become adhesive at a temperature between about 75°C. to about 400°C. Fibers coated with a polymer in accordance with the method of claim 1.