Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1985-09-09
1987-10-06
Anderson, Philip
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
264 41, 2642888, 2642902, 264DIG13, 521149, 521183, 521184, C08F 1400, C08J 900, B29C 6720, B29C 5510
Patent
active
046983724
ABSTRACT:
Microporous polymeric films having good water vapor transmission rates and hydrostatic resistance to the penetration of liquid water are obtained by stretching a composition consisting of a matrix of a thermoplastic orientable polymer having a hydrophobic surface, a glass transition temperature of less than 25.degree. C., a Vicat softening point of more than about 25.degree. 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 m, 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.
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Anderson Philip
E. I. Du Pont de Nemours and Company
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