Silver halide photographic materials spectrally sensitized with

Details Silver halide photographic materials spectrally sensitized with Silver halide photographic materials spectrally sensitized with

1988-02-10

1990-03-13

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430139, 430572, 430574, 430576, G03C 112, G03C 128

Patent

active

049083031

ABSTRACT:
A silver halide photographic material is disclosed containing at least one silver halide emulsion layer, in which (1) the silver halide grains constituting the emulsion layer have been spectrally sensitized by at least one adsorbable spectral sensitizing dye added thereto before the completion of chemical ripening of the grains, and (2) at least one luminous dye which has a quantum efficiency of 0.1 or more when the concentration thereof in dry gelatin at room temperature is 10.sup.-4 mol/dm.sup.3 and which can be substantially completely removed by development is added to a hydrophilic dispersion medium for the emulsion layer exclusive of the silver halide grains in a concentration of 2.0 mmol/dm.sup.3 in the dispersion medium. The addition of the spectral sensitizing dye is not limitative and can be either before the completion of the formation of the silver halide grains or during a stage from the completion of the formation of the grains to the completion of the chemical ripening thereof. By the combination of the spectral sensitization by the adsorbable spectral sensitizing dye and light-collecting sensitization by the luminous dye, the spectral sensitivity of the silver halide in the material is unexpectedly improved.

REFERENCES:
patent: 2735766 (1956-02-01), Hill
patent: 3622316 (1971-11-01), Bird et al.
patent: 4040825 (1977-08-01), Steiger et al.
patent: 4183756 (1980-01-01), Locker
patent: 4225666 (1980-09-01), Locker et al.
patent: 4543308 (1985-09-01), Schumann et al.
patent: 4683193 (1987-07-01), Ihama et al.
patent: 4693965 (1987-09-01), Ihama et al.
patent: 4820606 (1989-04-01), Miyasaka et al.
Patent Abstracts of Japan, vol. 10, No. 53, p. 433, Mar. 4, 1986.
Patent Abstracts of Japan, vol. 10, No. 282, p. 500, Sep. 25, 1986.

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