Polycarbonate sizing finish and method of application thereof
AssigneeCelanese Corporation
InventorsHowell L. Peterson, Paul E. McMahon
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Abstract
An improved polycarbonate sizing finish is provided comprised of a polycarbonate dissolved in a solvent mixture comprising N-methyl-2-pyrrolidone (NMP) and an alcohol having from 1 to 4 carbon atoms. The use of such a solvent mixture enables a relatively constant concentration of polycarbonate to be maintained, and consequently, enables a sized product fiber to be provided having a substantially uniform polycarbonate concentration thereon. In addition, the solvent may be readily and substantially completely removed from the sized fiber.
Claims10
In a method of applying a polycarbonate finish to a fiber whereby said fiber is contacted with a sizing composition comprising a polycarbonate dissolved in a solvent, said solvent subsequently being removed from said fiber, the improvement wherein said solvent comprises a major amount of N-methyl-2-pyrrolidone and a minor amount of an alcohol having from 1 to 4 carbon atoms.
Dependencies are inferred from the claim text.