Solvent casting process

Details Solvent casting process Solvent casting process

2006-11-07

2006-11-07

McDowell, Suzanne E. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

By casting liquids on a solid supporting or shaping surface

Reexamination Certificate

active

07132074

ABSTRACT:
The present invention provides a solvent casting process which comprises casting a dope which is a solution containing at least one kind of a polymer from a casting die onto a casting support, stripping off from the casting support and drying, wherein the force necessary for stripping off the dope from the die lip end of the casting die is 40 g/cm or smaller. According to the present invention, the employment of the foregoing constitution prevents the formation of the slugs at lateral edge portions of the dope because the cast dope would not adhere to the die lip end portion of the casting die. As a result, because a breaking down of the film would not occur without washing the apparatus, an efficient production of a film having superior evenness in the flatness can be achieved.

REFERENCES:
patent: 6660211 (2003-12-01), Topolkaraev et al.

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