Process for making cellulose triacetate photographic film base

Details Process for making cellulose triacetate photographic film base Process for making cellulose triacetate photographic film base

1994-09-16

1996-06-25

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264217, B29D 701, B29C 4126

Patent

active

055297374

ABSTRACT:
A method of making a cellulose triacetate photographic film base which includes delivering a dope solution of from 15 to 35 wt % of cellulose triacetate in dichloromethane based on the total weight of the solution under a pressure of from 7 atmospheres to 50 atmospheres and a temperature of from 41.degree. C. to 63.degree. C. to a surface maintained at atmospheric pressure; the surface being maintained at a temperature below the boiling point of dichloromethane.

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