Processing of aluminum oxide fibers
AssigneeBayer Aktiengesellschaft
InventorManfred Mansmann
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Abstract
In the production of aluminum oxide fibers comprising dry spinning an aluminum-containing solution to produce fiber and thereafter heat treating the fiber, the improvement which comprises applying to the fiber prior to heat treatment a solution of polyvinyl acetate in a solvent which is inert to the fiber. Advantageously the polyvinyl acetate is present in its solution in a concentration of about 0.1 to 10% by weight and is applied to the fiber in about 0.1 to 3 % by weight. The spinning solution may also contain SiO.sub.2 and polyethylene oxide, and the polyvinyl acetate solution may also contain di-n-butyl phthalate as a plasticizer for the polyvinyl acetate. The fiber bundles are characterized by increased strength and resistance to breaking during further processing.
Claims8
In the production of aluminum oxide fibers comprising dry spinning an aluminum compound-containing solution or sol to produce fiber and thereafter heat treating the fiber, the improvement which comprises applying to the fiber prior to heat treatment a solution of polyvinyl acetate in a solvent which is inert to the fiber.
In the processing of an aluminum oxide fiber bundle, the improvement which comprises employing as said bundle a material carrying thereon about 0.1 to 3% by weight of polyvinyl acetate as a sizing agent.
Dependencies are inferred from the claim text.