Process for preparing a microporous polymer film

Details Process for preparing a microporous polymer film Process for preparing a microporous polymer film

B - Operations, Transporting

29

C

18/33

B29C 55/06 (2006.01)

Patent

CA 1078118

ABSTRACT OF THE DISCLOSURE A process for the preparation of an open-celled microporous, poly- mer film. The improved process comprises the heat relaxing of a microporous polymer film which is formed from a non-porous, crystalline, elastic polymer film which has been uniaxially cold stretched at a temperature in the range of between about -20°C. and a temperature 25°C. below the crystalline melt- ing temperature of the polymer film, followed by hot stretching, in the same direction, the cold-stretched film at a temperature in the range of between about 25°C. below the crystalline melting temperature of the poly- mer film and 5°C. below the crystalline melting temperature of the polymer film. The heat relaxing step comprises exposing the film under tension to a temperature in the range of between about 40°C. below the crystalline melting temperature of the polymer film and 5°C. below the crystalline melting temperature of the polymer film, such that the maximum dimension in the direction of stretch, of the cold and hot stretched microporous film is reduced. The film produced in accordance with the process of this invention has improved dimensional stability as compared to the currently produced microporous film.

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