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Method of producing of cellulose ester film

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  • Title:
    Method of producing of cellulose ester film
  • Author: Yamazaki, Hidekazu ; Nakamura, Toshikazu ; Miyachi, Hiroshi
  • Description: In order to produce a cellulose ester film constructed of a front layer, an intermediate layer and a rear layer, a dope solution is doped on a supporter. In at least one of the front layer and the rear layer, a mass ratio of a cotton linter to a wood pulp (cotton linter/wood pulp) is between 5/95 and 0/100, and a solvent of the dope contains more than 15 wt.% alcohols and hydrocarbons whose carbon number each is 1-10. Further, a ratio of a solid content density of a solution for forming the front layer and the rear layer to a solid density of a solution for forming the intermediate layer is less than 0.9 wt.%, and a total thickness of the solutions for front and rear layers is more than 5% of the dope ribbon.
  • Creation Date: 2008
  • Language: English
  • Source: USPTO Issued Patents
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