Process for the preparation of coupler dispersions
AssigneeFuji Photo Film Co., Ltd.
InventorsSugihiko Tada, Yuzo Inukai
Life of this patent
Estimating the term…
Abstract
A process for preparing a coupler dispersion comprising contacting a coupler dispersion containing an auxiliary solvent with an auxiliary solvent carrying fluid medium through a hydrophobic macroporous film made of polytetrafluroethylene or polypropylene.
Claims22
A process for removing an auxiliary solvent from a hydrophilic colloid coupler dispersion containing an auxiliary solvent having a boiling point in the range of 60.degree.-100.degree. C. which comprises contacting the hydrophilic colloid coupler dispersion containing the auxiliary solvent with an auxiliary solvent-carrying fluid medium through a hydrophobic macroporous film made of polytetrafluroethylene or polypropylene permeable to the auxiliary solvent and impermeable to the hydrophilic colloid, whereby the auxiliary solvent diffuses from the hydrophilic colloid coupler dispersion through the hydrophobic macroporous film into the auxiliary solvent-carrying fluid medium.
Dependencies are inferred from the claim text.