Method for producing silver halide emulsion

Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing

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430567, G03C 1015, G03C 1035, G03C 107

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active

057562776

ABSTRACT:
A method for producing a silver halide emulsion comprising high silver chloride tabular grains each having a chloride content of 50 mol % or more and having a major plane comprising a (111) face, which comprises a step for conducting nucleation of said grains substantially in the absence of a crystal phase controlling agent to form grains which have two twin planes parallel with each other and of which most of the surface are (100) faces, a step for ripening said grains by adding a crystal phase controlling agent which adsorbs to the (111) face or a mixture of a crystal phase controlling agent which adsorbs to the (111) face and a protective colloid to reduce the ratio of grains other than the grains having two or more parallel twin planes and then a step for growing with remaining tabular grains having a major plane mainly comprising a (111) face to form tabular grains having a major plane comprising a (111) face.

REFERENCES:
patent: 4400463 (1983-08-01), Maskasky
patent: 4804621 (1989-02-01), Tufano et al.
patent: 5252452 (1993-10-01), Chang et al.
patent: 5286621 (1994-02-01), Verbeeck
patent: 5298387 (1994-03-01), Maskasky
patent: 5298388 (1994-03-01), Maskasky
patent: 5310644 (1994-05-01), Delton
patent: 5399478 (1995-03-01), Maskasky
patent: 5411852 (1995-05-01), Maskasky

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