C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/33
C08J 5/18 (2006.01) B01D 67/00 (2006.01) B29C 55/00 (2006.01) B29C 67/20 (2006.01)
Patent
CA 1317715
Title MICROPOROUS POLYMERIC FILMS AND PROCESS FOR THEIR MANUFACTURE ABSTRACT OF THE DISCLOSURE Microporous polymeric films having good water vapor transmission rates and hydrostatic resistance to the penetration of liquid water are obtained by stretching a precursor film formed from composition consisting of a matrix of a thermoplastic orientable polymer having a hydrophobic surface, a glass transition temperature of less than 25°C, a Vicat softening point of more than about 25°C, an ultimate elongation between those two temperatures of at least 100%, and a flexural modulus of less than 200 MPa and a particulate filler having an aspect ratio of less than 3, an average diameter of 0.05-50 µm, a negligible attraction to the matrix polymer, and a surface tension no higher than that of the matrix polymer at the latter's melting temperature. Such films are useful in applications involving separation of liquids and vapors, e.g., in making "breathing" waterproof garments or linings.
517513
E.i. Du Pont de Nemours And Company
Sim & Mcburney
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