Patent ID: 6955775
Filing Date: 2005-10-18
Classification: B01D,C08L,D01D,D01F,D04H,Y10S,Y10T

Abstract:
1. A method of making a fine fiber material comprising a fiber having a diameter of about 0.01 to 0.5 micron and a surface coating having a thickness of less than about 100 Å, the method comprises forming a solution comprising a lower alcohol, water or mixtures thereof and about 3 to about 30 wt % of a polymer composition, other than a copolymer formed from a cyclic lactam and a C 6-10 diamine monomer or a C 6-10 diacid monomer, and about 2 to 25 wt % of an additive, based on the polymer composition, the additive comprising a resinous material having a molecular weight of about 500 to about 3000 and an aromatic character wherein the additive is miscible in the polymer, exposing the polymer solution to an electric field of a potential greater than about 10×10 3 volts causing the solution to form accelerated strands of solution which upon evaporation of the solvent forms a fine fiber, collecting the fine fiber on a substrate and exposing the fine fiber and substrate to a heat treatment, the heat treatment raising the temperature of the fine fiber to a temperature less than the melting point of the polymer.