Breathable, non-porous polyurethane film prepared from a low mol

Details Breathable, non-porous polyurethane film prepared from a low mol Breathable, non-porous polyurethane film prepared from a low mol

1981-07-21

1983-01-04

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

4284231, 528 66, 528 67, 528 76, 528904, C08G 1832

Patent

active

043673279

ABSTRACT:
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.

REFERENCES:
patent: 3607822 (1971-09-01), Nishino
patent: 4202880 (1980-05-01), Fildes et al.

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