Organophosphine sulfides as photographic sensitizers

Details Organophosphine sulfides as photographic sensitizers Organophosphine sulfides as photographic sensitizers

1977-10-28

1978-09-19

Louie, Jr., Won H.

Gas separation: apparatus

Chromatography type apparatus

Having imbedded baffle or flow distributor

G03C 128

Patent

active

041151291

ABSTRACT:
Photographic colloid-silver halide emulsions are chemically sensitized by digestion at pH.gtoreq. 7 and the addition prior to or during digestion of at least one organophosphine sulfide of the general formula: ##STR1## WHEREIN (A) R is individually selected from the group consisting of hydrogen and a monovalent organic radical; m is 0, 1 or 2; and not more than one of said R's is hydrogen when m is 0; X represents a group having the formula: ##STR2## wherein Z is a divalent organic radical, n is 0 or 1, or (B) X.sub.m and R.sub.3-m together comprise a single trivalent heterocyclic radical.

REFERENCES:
patent: 3338712 (1967-08-01), Thurston
patent: 3895951 (1975-07-01), Riester et al.
patent: 3915714 (1975-10-01), Saleck et al.

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