Process of manufacturing a microporous sheet material
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United States of America Patent
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Dec 2, 1980
Issued Date -
N/A
app pub date -
Feb 13, 1979
filing date -
Feb 13, 1979
priority date (Note) -
Expired
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Abstract
A process of manufacturing a microporous sheet by forming a blend of a polyolefin, silica and a water insoluble plasticizer, forming a sheet from the blend, and contacting the sheet with water for a time sufficient to render the sheet microporous. The plasticizer, being essentially insoluble in water, is easily separated therefrom and recycled. The preferred plasticizers are dialkyl phthalates and dialkyl adipates having between about two and about eleven carbon atoms in the oxo-alcohol moiety.
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