Process for producing cellulose acylate film

Details Process for producing cellulose acylate film Process for producing cellulose acylate film

2005-05-24

2005-05-24

Wilson, James O. (Department: 1623)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

C536S063000, C536S064000, C536S065000, C536S068000, C536S069000, C536S124000

Reexamination Certificate

active

06897303

ABSTRACT:
A cellulose acetate film is produced from a solution of a cellulose acylate in a mixed solvent. The mixed solvent comprises a main solvent and an alcohol. The mixed solvent essentially does not contain chlorine atom. The main solvent comprises an ester and a ketone. The ester has a solubility parameter of 16 to 23. The ketone has a solubility parameter of 16 to 23. The alcohol has a solubility parameter of 20 to 30. The mixed solvent comprises the ester in an amount of 58 to 96 wt. %, the ketone in an amount of 2 to 15 wt. %, and the alcohol in an amount of 2 to 40 wt. %.

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