Method for forming ultra-microapertures in thin...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/36 (2006.01) B26F 1/26 (2006.01) B26F 1/31 (2006.01) B29C 59/16 (2006.01) B29C 61/06 (2006.01) B29D 28/00 (2006.01)

Patent

CA 2090075

ABSTRACT OF THE DISCLOSURE The invention is directed toward a method for forming a generally uniform pattern of ultra-microapertures in a thermoplastic film. The method includes the steps of: (a) forming a generally uniform pattern of microapertures in a thermoplastic film; and (b) heating the microapertured film in an unconstrained condition to a temperature where the microapertures shrink to ultra-microaperture size.

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