초록 ▼

Clothing weatherproofed by being coated with plastics material of low permeability to water vapor 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 mole

Clothing weatherproofed by being coated with plastics material of low permeability to water vapor 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 stoichiometric 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.

대표청구항 ▼

A breathable non-porous polyurethane film consisting of a block copolymer consisting of a low molecular weight difunctional compound to provide hard segments in the film, a polyethylene glycol to provide soft segments in the film and a diisocyanate, the polyethylene glycol being present in the amoun

A breathable non-porous polyurethane film consisting of a block copolymer consisting of a low molecular weight difunctional compound to provide hard segments in the film, a polyethylene glycol to provide soft segments in the film and a diisocyanate, the polyethylene glycol being present in the amount of from 25 to 45% by weight based on the total weight of the film forming constituents, and said polyethylene glycol having an average molecular weight not exceeding 2000.