High chloride folded tabular grain emulsions

Details High chloride folded tabular grain emulsions High chloride folded tabular grain emulsions

1993-05-12

1994-03-29

Baxter, Janet C.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430569, G03C 1035

Patent

active

052983854

ABSTRACT:
A process is disclosed of preparing an emulsion comprised of dispersing medium and folded tabular grains containing at least 95 mole percent chloride, based on total silver. This is achieved by maintaining a chloride ion concentration of at least 0.5 molar in the dispersing medium while the grain nuclei are being formed and during grain growth maintaining in the dispersing medium a pH in the range of from 1 to 8 and an effective concentration of 2-hydroaminoazine or xanthinoid morphological modifier in the range of from a 5.times.10.sup.-5 to 2.times.10.sup.-2 millimolar concentration.

REFERENCES:
patent: 4379837 (1983-04-01), Lapp et al.
patent: 4400463 (1983-08-01), Maskasky
patent: 4419443 (1983-12-01), Mifune et al.
patent: 4713323 (1987-12-01), Maskasky
patent: 4764457 (1988-08-01), Hotta et al.
patent: 4783398 (1988-11-01), Takada et al.
patent: 4804621 (1989-02-01), Tufano et al.
patent: 4868102 (1989-09-01), Ogi et al.
patent: 4952491 (1990-08-01), Nishikawa et al.
"The Seven Different Kinds of Crystal Forms of Photographic Silver Halides", Maskasky, J. E., Journal of Imaging Science, vol. 30, No. 6, pp. 247-254 (1986).

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