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The purpose of this study was to develop the high functional water vapor permeable/waterproof coated nylon fabric by using soluble chitosan powder in polyurethane coating solution(WSP fabric). Water entry pressure, water vapor transmission, moisture regain, static change, tearing strength, peeling strength, sewability of fabric, and reduction ratio of WSP fabric were measured for the study. The results of this study were as follows :1) The physical properties of WSP fabric treated by the use of a wet coating method were not changed very much. However, the water entry pressure decreased slightly with increasing concentration of soluble chitosan, while water vapor transmission increased slightly. In addition, tearing strength remained constant.2) Moisture regain of WSP fabric increased with the concentration of soluble chitosan . However, that of WSP fabric remained constant at above 1% concentration of soluble chitosan. Static change and peeling strength decreased with increasing the concentration of soluble chitosan. Sewability was improved with increasing concentration of soluble chitosan due to the reduction of friction on surface of WSP fabric.3) Over 90% reduction ratio of WSP fabric treated by the use of both dry and wet coating method was maintained with only 1% of chitosan even after 10 cycles of dry cleaning. Reduction ratio of WSP fabric treated by the use of a wet coating method was not changed, but reduction ratio of the sample treated by the use of a dry coating method decreased to 60% after 10 cycles of laundering.
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