Microporous polyolefin shaped articles with patterned surface areas of different porosity
AssigneeMinnesota Mining and Manufacturing Company
InventorJames S. Mrozinski
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Abstract
A microporous polyolefin shaped article is provided. The article comprises a polyolefin substrate of substantially uniform thickness having a patterned surface, the patterned surface providing substantially skinless areas having high microporosity and skinned areas of reduced microporosity. A method for preparing the article is also provided.
Claims10
A microporous polyolefin shaped article comprising a polyolefin substrate wherein the polyolefin substrate has a patterned surface, such that the patterned surface has substantially skinless areas of high microporosity and skinned areas of low microporosity and further the polyolefin substrate has substantially a uniform thickness over the substantially skinless areas and the skinned areas.
A microporous polyolefin extruded shaped article comprising a polyolefin substrate of substantially uniform thickness having a patterned surface, such that the patterned surface is formed when the polymer melt is cooled at the time the melt is extruded and has substantially skinless areas with high microporosity and skinned areas of low microporosity.
A microporous polyolefin extruded shaped article comprising a polyolefin substrate of substantially uniform thickness having substantially skinless areas having high microporosity and skinned areas of reduced microporosity said skinless areas and said skinned areas being formed during cooling of polymer melt at the time the melt is extruded.
Dependencies are inferred from the claim text.