Process for making a cellulose triacetate photographic film base

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

1996-01-11

1997-11-11

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421111, 264212, 264217, B29C 4126

Patent

active

056860366

ABSTRACT:
The invention provides a method of making a cellulose triacetate photographic film base which comprises providing a casting composition of cellulose triacetate, plasticizer, and solvent having a cellulose triacetate and plasticizer concentration of from 36% to 72% by weight, casting the coating composition at a temperature of from 40.degree. C. to 63.degree. C. unto a surface maintained at from -70.degree. C. to 21.degree. C. for a residence time from 3 to 8 seconds, in accordance with the equation Tr/Tg<1.9, where Tg and Tr are the glass transition temperature in degrees Kelvin and the temperature of the casting composition in degrees Kelvin at a point adjacent to the surface where the film base is separated from the surface.

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patent: 5529737 (1996-06-01), Arrington et al.
patent: 5580911 (1996-12-01), Buchanan et al.

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