High chloride (100) tabular grain emulsions containing large, th

Details High chloride (100) tabular grain emulsions containing large, th High chloride (100) tabular grain emulsions containing large, th

1997-03-11

1998-04-28

Huff, Mark F.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430569, G03C 1035

Patent

active

057442975

ABSTRACT:
A radiation-sensitive emulsion is disclosed in which at least 70 percent of total grain projected area is accounted for by tabular grains (a) having {100} major faces, (b) containing greater than 50 mole percent chloride, based on silver, (c) having a mean equivalent circular diameter in the range of from 2.0 to 5.0 .mu.m, and (d) exhibiting a mean thickness of 0.1 .mu.m or less.
The emulsion is prepared by (a) precipitating up to 10 percent of the total silver forming the high chloride {100} tabular grains to create a first grain population under conditions that form a crystal lattice structure that favors the growth of high chloride {100} tabular grains, (b) thereafter rapidly introducing silver and halide ions to create a second grain population, and (c) growing the first grain population to create the high chloride {100} tabular grains by ripening out the second grain population.

REFERENCES:
patent: 5238805 (1993-08-01), Saitou
patent: 5254454 (1993-10-01), Mimiya et al.
patent: 5292632 (1994-03-01), Maskasky
patent: 5314798 (1994-05-01), Brust et al.
patent: 5320938 (1994-06-01), House et al.
patent: 5413904 (1995-05-01), Chang et al.
patent: 5607828 (1997-03-01), Maskasky
patent: 5663041 (1997-09-01), Chang et al.

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