4,7-Dihydroxybenzimidazole hydrobromide as antifogger

Details 4,7-Dihydroxybenzimidazole hydrobromide as antifogger 4,7-Dihydroxybenzimidazole hydrobromide as antifogger

1977-11-23

1978-12-26

Louie, Jr., Won H.

Gas separation: apparatus

Electric field separation apparatus

Including gas flow distribution means

96 665, 96 95, 96109, G03C 530, G03C 134

Patent

active

041314670

ABSTRACT:
Compounds of the general formula ##STR1## wherein A and B are hydroxy radicals in the 4,7 or 5,6 positions and X.sup.- represents Br.sup.-, Cl.sup.- or I.sup.- are incorporated into light-sensitive silver halide emulsions to improve their sensitometric characteristics. In general, these compounds act as antifoggants by restraining fog growth but at the same time act as development accelerators by increasing gradient and Dmax, usually at some speed loss.

REFERENCES:
patent: 2384593 (1945-09-01), Bean
patent: 2418613 (1947-04-01), Allen et al.
patent: 2893865 (1959-07-01), Welliver et al.
patent: 3137578 (1964-06-01), De Selms
patent: 3271154 (1966-09-01), Dersch et al.
patent: 3499761 (1970-03-01), Dersch et al.
patent: 3761278 (1973-09-01), Gauss et al.
patent: 3850638 (1974-11-01), Willis et al.
Faerman -- The Journal of Photographic Science, vol. 15, 1967, pp. 22-28.
Birr: Stabilization of Photographic Silver Halide Emulsions, The Focal Press, Oct. 1975, pp. 180-183.

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