2-stage ultrafiltration process for photographic emulsions

Details 2-stage ultrafiltration process for photographic emulsions 2-stage ultrafiltration process for photographic emulsions

1991-02-20

1992-11-17

Sever, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210651, 21032164, B01D 6114, B01D 6118

Patent

active

051640929

ABSTRACT:
Photographic emulsions, particularly those produced by a silver halide reaction, are concentrated and, optionally, washed in a 2-stage ultrafiltration system. The system includes a spiral wound ultrafiltration module and a plate and frame ultrafiltration module. Serial use of these two ultrafiltration systems permits the viscosity of the resulting emulsion to be increased, at commercial scale production levels, to a level suitable for curtain coating photographic substrates.

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Research Disclosure--Jul. 1975.

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