Method of producing of cellulose ester film

Details Method of producing of cellulose ester film Method of producing of cellulose ester film

2002-06-14

2008-12-30

Huson, Monica A (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

By casting liquids on a solid supporting or shaping surface

C264S173110, C264S177110

Reexamination Certificate

active

07470384

ABSTRACT:
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.

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Machine translation for JP 06-134933 A obtained from http://www.ipdl.ncipi.go.jp/homepg—e.ipdl.
Machine Translation of JP 10-058514 obtained at http://www.ipdl.ncipi.go.jp/homepg—e.ipdl.

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