Eastman-kodak Company

Colin Holstead

Kenneth N Kilminster

Michael J Simons

Bernard A Clark

Wojciech M Przezdziecki

Hans M Wagner

Robert E Booms

A dye-forming photothermographic element comprises in a binder, in reactive association,

Sensitive silver halide photothermographic materials for producing dye

Granularity of silver halide photographic materials is reduced by employing a coupler which yields a dye of such mobility that controlled image smearing occurs.

Photographic silver halide materials

Cyan azo dye-providing compounds have the formula: ##STR1## wherein: R.sup.1 is selected from the group consisting of aryl, alkyl or NR.sup.11 R.sup.12 wherein R.sup.11 is alkyl or aryl and R.sup.12 is alkyl, or R.sup.11 and R.sup.12, taken together with the nitrogen atom to which they are attached, is a heterocyclic group;

Carbonyl-substituted cyan azo dye-providing materials

Compounds which release cyan dyes or dye forming materials

Certain azo compounds are useful as spectral sensitizing dyes in photographic silver halide materials, and particularly in photothermographic materials. These azo compounds comprise moieties capable of forming substantially insoluble silver salts thereby substantially improving sensitization of silver halides.

Photographic materials comprising azo sensitizing dyes

Light-sensitive compositions including a polymer of the type that is reactable with an azide sensitizer when exposed to light and a sensitizing amount of a naphthalene sensitizer having ortho diazo and oxo substituents at the 1,2 or the 2,1 positions of the naphthalene nucleus and further having an azidosulfonyl substituent group of which the sulfonyl moiety is bonded directly to the naphthalene nucleus at the 4 or the 5-position, are advantageous in the preparation of positive-working photolithographic materials. IN the azidosulfonyl group, the azido moiety can be linked directly or indirectly to the sulfonyl moiety, such as in the compounds 2-diazo-1,2-dihydro-1-oxo-5(4'-azidophenoxysulfonyl)naphthalene and 5-azidosulfonyl-2-diazo-1,2-dihydro-1-oxonaphthalene. The light-sensitive compositions can be coated on support materials to prepare composite photographic elements having utility as photolithographic printing masters and photoresists for etching operations.

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Abbots Langley, United Kingdom

Colin Holstead