Hybrid microporous membrane
First Claim
1. A coated microporous membrane comprising a microporous membrane with a coating of breathable material which augments a liquid penetration resistance of the membrane while maintaining transport of moisture vapor.
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Accused Products
Abstract
A construction of breathable film upon a membrane with pores or passages that extend through the porous membrane enables the membrane to maintain a moisture vapor transport, namely, to be breathable, while the breathable film on the surface of the porous membrane serves as a barrier to the ingress of unwanted liquids. In the porous membrane, the diameter of an individual one of the pores is sufficiently small so as to enable the porous membrane to support a section of a reduced-thickness breathable film extending across openings of the pores without rupturing the breathable film.
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Citations
13 Claims
- 1. A coated microporous membrane comprising a microporous membrane with a coating of breathable material which augments a liquid penetration resistance of the membrane while maintaining transport of moisture vapor.
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13. A hybrid microporous membrane comprising layers of material, disposed one upon another, wherein a first of said layers of material comprises a breathable film impeding passage of liquid water while communicating water vapor, and a second of said layers of material comprises a microporous membrane having pores extending through the microporous membrane with a mean pore size in the range of 0.1-5.0 microns, and wherein the breathable film has a thickness in the range of 0.5-10 microns.
Specification