Method For Preparing Cellulose-Based Film and Cellulose-Based Film

  • US 20090152493A1
  • Filed: 12/10/2008
  • Published: 06/18/2009
  • Est. Priority Date: 12/10/2007
  • Status: Active Grant
First Claim
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1. A method for preparing a cellulose-based film, the method comprising the steps of:

  • preparing a dope from a composition comprising 5-15 wt % of a pulp having an alpha-cellulose content of more than 90% and 85-95 wt % of an aqueous N-methylmorpholine-N-oxide solution;

    extruding the dope from a die onto a running support;

    casting the extrudate to form a sheet-shaped material;

    washing the cast sheet with water to remove N-methylmorpholine-N-oxide therefrom; and

    drying the washed sheet.

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