Microporous polyolefin shaped articles with patterned surface areas of different porosity
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United States of America Patent
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Jun 9, 1992
Issued Date -
N/A
app pub date -
Jun 10, 1991
filing date -
Nov 20, 1989
priority date (Note) -
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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.
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