Water-vapor-permeable, waterproof, highly elastic films

Details Water-vapor-permeable, waterproof, highly elastic films Water-vapor-permeable, waterproof, highly elastic films

1985-12-09

1987-09-08

Van Balen, William J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428230, 428290, 428422, 428910, B32B 326

Patent

active

046923691

ABSTRACT:
A water-vapor-permeable, waterproof, highly elastic film of expanded, porous, unsintered polytetrafluoroethylene having impregnated within the pores of the porous film, on both sides thereof, a water-vapor-permeable resin, for example, an elastomer containing urethane bonds and a hydrophilic group(s) in its molecular structure. The film of this invention is useful in clothing, tents, and various applications where water vapor transmission characteristics and waterproofness are simultaneously desired. The film has elongation percentage in at least one direction exceeding 40% and durability in repeated stretching to 80% of its elongation percentage of more than 200,000 cycles.

REFERENCES:
patent: 3953566 (1976-04-01), Gore
patent: 4113912 (1978-09-01), Okita
patent: 4194041 (1980-03-01), Gore et al.
patent: 4443511 (1984-04-01), Worden et al.
patent: 4539256 (1985-09-01), Shipman
patent: 4613544 (1986-09-01), Burleigh

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