Barrier products
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United States of America Patent
Stats
-
Apr 2, 1991
Grant Date -
N/A
app pub date -
Jul 13, 1989
filing date -
Nov 22, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A porous material, e.g. a paper, has pores with a range of sizes. A pore modifying agent comprising particles of a narrow size range is selectively incorporated within the larger pores to provide zones of high surface area. These greatly reduce the penetrability of the material, e.g. by mirco-organisms, while having relatively little effect on its air-permeability. The modifying agent may be incorporated by creating a pressure difference across the material, and treating it with a dispersion, e.g. an aerosol, of the modifying agent, under conditions of low inertia, and incorporating only a small amount of the agent, e.g. not more than 1% w/w.
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