Methods of forming stable dispersions of photographic materials

Details Methods of forming stable dispersions of photographic materials Methods of forming stable dispersions of photographic materials

1991-02-01

1992-10-27

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

430493, 430512, 430566, 430546, 430635, 430636, 430637, 252335, 252337, 252354, G03C 104, G03C 138, G03C 174, G03C 732

Patent

active

051588633

ABSTRACT:
The invention is performed by providing a first flow of water and surfactant, a second flow comprising solvent, base and photographic material, and mixing said first and second streams and either simultaneously or immediately following thereof neutralizing said streams to prevent hydrolysis of a hydrolyzable surfactant and/or premature precipitation of particles before neutralization. The streams then may be immediately treated for formation into photographic materials. In a preferred method the first and second stream may be brought together immediately prior to a mixer with addition of acid directly into the mixer to neutralize the dispersion of fine particles.

REFERENCES:
patent: 3658546 (1972-04-01), Van Doorselaer et al.
patent: 3860425 (1975-01-01), Ono et al.
patent: 3912517 (1975-10-01), Van Poucke et al.
patent: 4933270 (1990-06-01), Bagchi
patent: 4957857 (1990-09-01), Chari
patent: 4970139 (1990-11-01), Bagchi
patent: 4990431 (1991-02-01), Bagchi et al.
William J. Priest, Research Disclosure 16468, Dec. 1977, pp. 75-80.

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