Patent ID: 7413804
Filing Date: 2008-08-19
Classification: B01D,Y10T

Abstract:
1. A method of coating a polymeric resinous thin film having a predetermined thickness on a surface of a tubular braid reinforcing material, said polymer resinous thin film consisting of two layers, a single skin layer with micro pores having a diameter in the range from 0.01 to 1 μm and a single inner layer of a sponge structure with micro pores having a diameter less than 10 μm, the method comprising: spin coating a polymeric resinous coating material including a polymer resin, an organic solvent polyvinylpyrollidone and a hydrophilic compound on the surface of the tubular braid, extruding it into the air, and coagulating the coating material in a coagulating bath, wherein the ration (k) of the spin coating feed rate (Q) and the braid advancing speed (v) with respect to a unit outer diameter (D falls within the range of 200 to 3,000 g/m