Process for producing cellulose triacetate film

Details Process for producing cellulose triacetate film Process for producing cellulose triacetate film

1991-04-17

1992-10-06

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

By casting liquids on a solid supporting or shaping surface

264207, B29D 701

Patent

active

051529475

ABSTRACT:
A cellulose triacetate film excellent in both of the tear strength and the folding endurance can be obtained by casting a cellulose triacetate dope using a solvent mixture of methylene chloride with the other solvent in a ratio of 13 to 25 wt. % of the total solvent weight on a support of which the surface temperature is kept lower than 10.degree. C., and drying with controlling the drying conditions so that the content of volatile components in the film and the film surface temperature enter a particular region or so that the content of volatile components in the film and the shrinkage percentage of the film in the cross direction enter in a particular region. The film thus obtained is also excellent in flatness.

REFERENCES:
patent: 3855133 (1974-12-01), Roehsler
patent: 4592885 (1986-06-01), Ichino et al.
patent: 4643856 (1987-02-01), Nichols

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