Solution casting process for producing polymer film

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

2007-02-06

2007-02-06

Lechert, Jr., Stephen J. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

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

C264S082000, C264S083000, C264S556000

Reexamination Certificate

active

10720537

ABSTRACT:
A solution casting process for producing cellulose triacetate (TAC) film is provided. Bead of dope, which includes cellulose triacetate and solvent, is cast on to a rotating supporting drum, to form self-supporting cast film. The self-supporting cast film is stripped from the supporting drum. The self-supporting cast film is dried while the self-supporting cast film being stripped is fed by feed rollers, to form the cellulose triacetate film. A surface temperature of the feed rollers is set equal to or lower than 0° C. The self-supporting cast film upon being stripped has modulus of longitudinal elasticity equal to or more than 450,000 Pa.

REFERENCES:
patent: 6660211 (2003-12-01), Topolkaraev et al.
patent: 2 114 050 (1983-08-01), None
patent: 2001-315147 (2001-11-01), None

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