Production method of cellulose film, cellulose film,...

Details Production method of cellulose film, cellulose film,... Production method of cellulose film, cellulose film,...

2005-05-03

2005-05-03

Eashoo, Mark (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

By casting liquids on a solid supporting or shaping surface

Reexamination Certificate

active

06887415

ABSTRACT:
A production method of cellulose film wherein cellulose film is produced by preparing a polymer solution through dissolving cellulose ester in a solvent containing a prescribed organic solvent as the main component, forming a filmy object from the prepared polymer solution, and evaporating the solvent in the filmy object; the residual amount of the organic solvent is reduced while the film quality is not degraded, and the production efficiency is degraded to a least possible extent; a poor solvent, highest in boiling point among the materials contained in the solvent, is added in the content ranging from 0.1 wt % to 1.0 wt %, taking the total amount of the solvent in the prepared polymer solution to be 100 wt %; and the solubility of cellulose ester in the poor solvent is inferior to the solubility of the cellulose ester in the organic solvent which is the main component of the solvent.

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patent: 20030224113 (2003-12-01), Nakamura
patent: 04275192 (1992-09-01), None

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