Porous polyethylene film
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United States of America Patent
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-
May 17, 1983
Grant Date -
N/A
app pub date -
Dec 31, 1981
filing date -
Jan 16, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A porous polyethylene film was obtained which is characterized in that micropores are contiguous with one another from one surface to the other surface of the film to constitute a laminar structure, and said micropores assume the form of strips being composed of microfibrils that are arrayed in a direction in which the film is stretched and nodular portions that are coupled to said microfibrils nearly at right angles thereto, wherein the micropores have an average pore diameter over a range of 0.05 to 2 microns as measured using a mercury porosimeter, said film has a porosity over a range of 30 to 90%, and an elastic recovery factor from the 50% stretching ratio is less than 50%.
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