Solution casting process for producing polymer film

Details Solution casting process for producing polymer film Solution casting process for producing polymer film

2006-11-28

2006-11-28

McDowell, Suzanne E. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

C264S085000, C264S216000, C264S234000

Reexamination Certificate

active

07141189

ABSTRACT:
Cellulose triacetate film is produced by a solution casting process. Dope, which includes cellulose triacetate and mixed solvent with methyl acetate, is cast on a rotary drum in a form of bead by use of a flow casting die, to form gel film. When a self-supporting characteristic of the gel film becomes higher than one limit value, the gel film is stripped from the rotary drum by use of a stripping roller, to obtain the cellulose triacetate film. During the casting step, a surface of the rotary drum is cooled at −10° C. or lower.

REFERENCES:
patent: 6660211 (2003-12-01), Topolkaraev et al.
patent: A 10-45917 (1998-02-01), None
patent: A 2001-294667 (2001-10-01), None

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