B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
154/84, 204/91.5
B32B 27/12 (2006.01) A41D 31/02 (2006.01) B32B 5/22 (2006.01) B32B 27/16 (2006.01) B32B 27/28 (2006.01) B32B 37/14 (2006.01) D06N 3/04 (2006.01)
Patent
CA 1290235
ABSTRACT OF THE DISCLOSURE A method of producing a waterproof, gas-permeable composite sheet comprising the steps of: (a) preparing a film from a composition comprising 40-70 weight % of an ethylene- propylene-diene copolymer and 30-60 weight % of an ethylene- vinyl acetate copolymer; and (b) adhering the film to a woven or nonwoven fabric by hot pressing while causing the heat shrinkage of the film simultaneously, thereby making the film microporous. The composition may further contain linear low-density polyethylene to improve film-forming properties. By subjecting the hot-pressed composite sheet to a plurality of heating-cooling steps, it is provided with high heat resistance. In addition, by foaming the film and hot-pressing it to a stretchable woven or nonwoven fabric and then stretching, the composite sheet is further provided with high stretchability.
590201
Kagawa Seiji
Smart & Biggar
Tonen Sekiyukagaku Kabushiki Kaisha
LandOfFree
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