Breathable, non-porous polyurethane film

Details Breathable, non-porous polyurethane film Breathable, non-porous polyurethane film

C - Chemistry, Metallurgy

08

J

18/12, 117/88.5

C08J 9/00 (2006.01) C08G 18/10 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01) C08G 18/80 (2006.01) D06M 15/564 (2006.01) D06N 3/14 (2006.01)

Patent

CA 1169609

ABSTRACT BREATHABLE, NON-POROUS POLYURETHANE FILM Clothing weatherproofed by being coated with plastics material of low permeability to water vapour is uncomfortable to wear. The present invention provides a breathable polyurethane film for coating on fabrics to make them waterproof. The film comprises a hard segment formed by reaction of a low molecular weight difunctional compound with excess diisocyanate to form a prepolymer and a soft segment provided by polyethylene glycol with which the prepolymer is reacted in a stoichiometric amount. If desired the film can be formed by reacting the polyethylene glycol with excess diisocyanate to form a prepolymer which is then reacted with a stoichio- metric amount of a low molecular weight difunctional compound. The mechanical properties of the film can be improved by cross linking with a cross linking agent such as a triisocyanate.

381486

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