Patent ID: 7488517
Filing Date: 2009-02-10
Classification: A41B,B29C,B29L,D06N

Abstract:
1. A method of producing porous flexible polymer coated socks that is comprised of: step 1 of preparing double layered socks, which are knitted with yarn comprised of monofilament, which is comprised of a plurality of interlinear structural units having the formula, wherein m and n are positive integers; G is a long chain polymeric radical free from substituents reactive with an isocyanate and having a molecular weight above 950 and which in its hydroxyl-terminated form, has a melting point below 70 C.; and R is a divalent radical containing an aromatic ring and selected from the group consisting of p,p′-methylenendiphenyl, p,p′-isopropylidenediphenyl, p,p′-oxydiphenyl, p,p′-thiodiphenyl, and the foregoing radicals having methyl substituents on the rings, coiled with polyester monofilament to render elasticity to the main body and having additional terry that is formed with cotton fiber to absorb sweat, and the outer layer of the sole of the sock is knitted with 70% stretched polyester yarn and 70% stretched nylon yarn for compatibility with the polymer solution to be coated later and twelve lines of elastic rubbery band are formed surrounding the middle area of the lower part of the sock from the arch portion to the insole portion, and step 2 of wearing socks prepared in step 1 on a mold that is connected to a mold hanger, which is hung on a conveyer line, and step 3 of dipping the sock worn on the mold into a solution of 4 wt % calcium nitrate in methanol for 4 seconds at room temperature up to line (A) that is marked just above the arch portion of the sock, and step 5 of dipping the sock treated at step 3 into the solution prepared in step 4 for four seconds up to line (A) that is marked just above the arch portion of the sock, and step 6 of drying the first polymer solution coated sock at 85° C. for 2 minutes, and step 7 of preparing a second polymer solution having viscosity of 875 centipoises by mixing 100 kg of natural rubber solution (solid portion 65% balanced water), 17 kg of cold NBR (acrylonitrile butadiene rubber, Mooney viscosity of 22, acrylonitrile content 27%) solution (45% cold NBR+55% distilled water), 8 kg of polymer hardener ZMBT (zinc-2-mercapto benzo thiazole), 0.5 kg of black dye, 10 kg of acrylic viscosity increaser, 5 kg of bubbling agent (oleic acid), 7 kg of 1 wt % Silver impregnated {Na step 8 of dipping the sock treated at step 6 into the second solution prepared in step 7 for 10 seconds up to a line (B) that is marked between the arch portion and bottom of the sock, step 9 of drying the second polymer solution coated sock at 85° C. for 30 minutes, and step 10 of washing the sock from step 9 in a cleaning solution to eliminate the calcium nitrate and organic solvents and drying 110° C. for 40 minutes.