Coating processes – Applying superposed diverse coating or coating a coated base – Synthetic resin coating
Reexamination Certificate
2007-03-15
2009-02-10
Fletcher, III, William Phillip (Department: 1792)
Coating processes
Applying superposed diverse coating or coating a coated base
Synthetic resin coating
C427S430100
Reexamination Certificate
active
07488517
ABSTRACT:
A method of producing a porous, rubbery polymer coated sock comprising: 1) preparing a double layered sock; 2) wearing the sock on mold hanging on a continuous line; 3) pre-treating the sole portion of the sock a with calcium nitrate solution; 4) preparing a first nitrile rubber solution by stirring a solution comprising foaming agents and acrylo-nitrile butadiene rubber (NBR) at 1,200 r.p.m. for 30 minutes; 5) dipping the sock worn on the mold in a first, deep bath containing the first, foamed nitrile rubber solution; 6) air-drying the solvent in the polymer solution and developing foam in the rubber layer; 7) preparing a second, foamed nitrile rubber solution by stirring a solution comprising foaming agents and nitrile rubber at 1,200 r.p.m. for 30 minutes; 8) dipping sock worn on the mold in a second, shallow bath containing the second, foamed nitrile rubber solution; 9) air-drying the solvent in the second polymer solution and developing foam in the rubber layer; and 10) washing the sock from step 9) in a cleaning solution to eliminate the calcium nitrate and organic solvents and drying the washed sock 110° C. for 40 minutes. The sock thus produced has a bottom face covered with nitrile rubber foams having 0.5 μm voids therein. The portion of the sock from toe to ball is coated with nitrile rubber foam of 1 mm to 3 mm thickness, while the heel portion of the sock is coated with nitrile foam of 0.5 mm thickness. The nitrile rubber foam coating provides a friction surface as well as a cushion for shock absorption.
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Kang Young Choon
Whang Brian
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