Breathable, waterproof sheet materials and methods for making th

Details Breathable, waterproof sheet materials and methods for making th Breathable, waterproof sheet materials and methods for making th

1987-10-08

1989-05-23

Anderson, Philip

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

264 41, 264136, 264147, 264154, 2642888, 428910, C08J 936, B29C 5510

Patent

active

048330264

ABSTRACT:
The present invention relates to breathable, waterproof sheet materials comprising a microporous polymeric film and a hydrophilic filler material infiltrated into the pores of the film, and to methods for making such sheet materials. In the methods of the present invention, the liquid hydrophilic material or precursor thereof is infiltrated into the pores of the microporous film after the film has been stretched in the lengthwise direction, but before the film is stretched in the transverse direction. By coating the microporous film prior to the transverse stretching step, superior waterproof sheet materials are obtained.

REFERENCES:
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patent: 4457254 (1984-07-01), Hungerford
patent: 4539256 (1985-09-01), Shipman
patent: 4613544 (1986-09-01), Burleigh
patent: 4726989 (1988-02-01), Mrozinski

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