Reduction of openness of material
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United States of America Patent
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-
Dec 9, 1997
Grant Date -
N/A
app pub date -
May 15, 1996
filing date -
Jun 10, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A material, which may have a highly open structure such that it has negligible barrier properties, is treated with expandable particles. These are then caused to expand within the material, reducing its openness and improving its barrier properties. The product may be a porous material. The pores may be modified by an agent applied together with the particles or after the expansion. The particles may be thermoplastic microspheres containing gas. The material may be a network material, with a fiber matrix with many voids.
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