Method For Preparing Cellulose-Based Film and Cellulose-Based Film
First Claim
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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Accused Products
Abstract
Disclosed herein is a method for preparing a cellulose-based film from raw material pulp, the method including 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. The method enables the cellulose-based film to be prepared from environmentally friendly wood pulp through an environmentally friendly process.
2 Citations
19 Claims
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1. A method for preparing a cellulose-based film, the method comprising the steps of:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A cellulose-based film which contains no sulfur therein, contains N-methylmorpholine-N-oxide at a concentration of less than 50 ppm and is composed of a backbone of alpha-cellulose.
Specification