Photographic roomlight materials containing halogen acceptors

Details Photographic roomlight materials containing halogen acceptors Photographic roomlight materials containing halogen acceptors

1991-03-13

1992-06-16

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430567, 430606, 430614, G03C 106

Patent

active

051224348

ABSTRACT:
A halogen acceptor according to general chemical formula (I) is added to a photographic negative roomlight emulsion, consisting of at least 90% of silver chloride, having an average grain size smaller than 0.3 micron, and internally doped with an element of group VIII of the periodic table. ##STR1## In this formula: R.sup.1 =alkyl having at least 4 C-atoms, preferably between 4 and 9.
In the coated emulsion layer, the halogen acceptors of the invention provide a clear print-out effect and an improved development latitude when the emulsion layer is developed in a "hard-dot Rapid Access" processing system.
In a preferred embodiment R=--C.sub.6 H.sub.13 and the element of group VIII is Rhodium.

REFERENCES:
patent: 3287137 (1966-11-01), McBride
patent: 3502471 (1970-03-01), Van Pee et al.
patent: 4912017 (1990-03-01), Takagi et al.
patent: 4939067 (1990-07-01), Takagi et al.
Research Disclosure, Mar. 1973, Item 10723, pp. 29-30, Anonymous.

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