Short glass fibers covered with polymeric materials
AssigneeBayer Aktiengesellschaft
InventorsUwe Hucks, Hugo Vernaleken
Life of this patent
Estimating the term…
Abstract
This invention provides spheres of high molecular weight thermoplastics filled with short glass fibers which may be easily metered, incorporated into thermoplastic resins or fused into glass mats or shaped articles. It also provides a method of producing such spheres by treating glass fibers with a dilute (1 to 30 wt% strength) solution of the plastic having a viscosity of less than 1,000 cP. The fibers are rotated with the polymer solution and the solvent is subsequently evaporated off. Preferably, the coating plastic is a high molecular weight thermoplastic.
Claims11
Process for the production of spheres of high molecular weight organic thermoplastic resins filled with short glass fibers having an average diameter of 1 to 15 mm and containing from 1 to 30% by weight of high molecular weight thermoplastics comprising:
- a. mixing short glass fibers having an average length of between 0.1 and 10mm in a 1 to 30% strength by weight solution of high molecular weight thermoplastics having a viscosity less than 1,000 cP;
- b. rotating the mixture of short glass fibers and high molecular weight thermoplastics solution in an apparatus which rotates about an axis which passes through said apparatus to form spheres of high molecular weight thermoplastics filled with short glass fibers;
- and
- c. subsequently drying the spheres of high molecular weight thermoplastics filled with short glass fibers to free said spheres from solvent.
A process for the production of spheres of high molecular weight organic thermoplastic resins filled with fibers selected from the group consisting of mineral fibers, carbon fibers and other inorganic fibers exclusive of glass fibers having an average diameter of between 1 and 15 mm and containing from 1 to 30% by weight of high molecular weight thermoplastics comprising:
- a. mixing said fibers having an average length of between 0.1 and 10 mm in a 1 to 30% strength by weight solution of high molecular weight thermoplastics having a viscosity of less than 1000 cP;
- b. rotating the mixture of said fibers and high molecular weight thermoplastics solution in an apparatus which rotates about an axis which passes through said apparatus to form spheres of high molecular weight thermoplastics filled with said fibers;
- and
- c. subsequently drying the spheres of high molecular weight thermoplastics filled with said fibers to free said spheres from solvent.
Dependencies are inferred from the claim text.