Macroporous substrate containing microporous matrix
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United States of America Patent
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Aug 2, 1988
Grant Date -
N/A
app pub date -
Mar 7, 1986
filing date -
Mar 7, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a porous structure, a macroporous polyethylene substrate defining a network of interconnecting macropores and a microporous matrix of polyvinyl chloride is formed within and completely fills the network of macropores. The microporous matrix is cast within the network of macropores by impregnating the macropores with a solution of a solvent, a polymeric pore former, and polyvinyl chloride. The solution is caused to imbibe water from the atmosphere so as to separate into two liquid phases, one phase being rich in the polyvinyl chloride and the other phase being rich in water. The microporous matrix is coagulated from the first phase and the solvent and pore former are extracted from the macroporous matrix.
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