Method for producing water repellent down
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United States of America Patent
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Aug 15, 2017
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app pub date -
Jan 29, 2015
filing date -
Jan 29, 2015
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Abstract
A method for producing water repellent down includes soaking cleaned down in an aqueous solution having a pH ranging from 4 to 7; adding to the solution a cross-linking agent composed of a material having an isocyanate or acrylic acid functional group to provide a solution having a weight ratio of the down and the cross-linking agent ranging between 1:0.005 and 1:0.06; adding to the solution a water-drawing agent composed of a material having a siloxane functional group to provide a solution having a weight ratio of the down and the water-drawing agent ranging between 1:0.01 and 1:0.1; stirring the solution for at least 15 minutes to react the cross-linking agent and the water-drawing agent and form a water repellent layer on the surface of the down; separating the down from the solution; and oven drying the down with hot air having a temperature of at least 120° C.
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