Orientied microporous film
AssigneeMinnesota Minning and Manufacturing Company
InventorKevin E. Kinzer
Life of this patent
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Abstract
A microporous article is provided. The article comprises a thermoplastic polymeric structure having a plurality of cells with adjacent cells being interconnected by passageways to provide a network of communicating pores. The structure is oriented in at least one direction.
Claims18
A microporous article comprising a thermoplastic polymeric structure formed by liquid-liquid phase separation having a plurality of cells with adjacent cells being interconnected by passageways to provide a network of communicating pores, said cells comprising void spaces encased by fibrous, lacy, or semi-continuous boundaries and being ellipsoidal in shape, and said structure being oriented in at least one direction.
An article comprising a sheet material having thermoplastic polymeric structure formed by a liquid-liquid phase separation having a microporous structure with a plurality of cells with adjacent cells being interconnected by pores to provide a network of communicating pores extending to one major surface of said sheet material and a non-microporous structure at an opposite major surface of said sheet material.
Dependencies are inferred from the claim text.