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AssigneeMinnesota Mining and Manufacturing Company
InventorsJames S. Mrozinski, Harold J. Seppala
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The invention discloses an oleophobic, hydrophobic, water repellent, moisture vapor and air permeable, heat sealable, microporous membrane material suitable for garment applications. The membrane material comprises a polyolefin polymer, a processing compound which is miscible with the polymer at its melt temperature but phase separates when the polymer is cooled to or below its melt temperature, and a fluorochemical composition. The membrane material is oriented in at least one direction. The membrane materials retain their repellency and moisture vapor permeable properties for extended periods of time in garment applications which expose the membrane materials to perspiration residues which are known to generally contaminate and ultimately destroy the repellency properties of conventional liquid repellent, moisture vapor permeable treatments.
A microporous membrane material which comprises a crystallizable olefin polymer, a processing compound which is miscible with the olefin polymer at the polymer's melting point but phase separates on cooling to or below the olefin crystallization temperature of the polymer, the blending ratio of polyolefin to processing compound being in the range of about 40:60 to 80:20, and a fluorochemical oxazolidinone compound, said material being oriented in at least one direction.
Dependencies are inferred from the claim text.