Tertiary amino contrast increasers for ultrahigh contrast silver

Details Tertiary amino contrast increasers for ultrahigh contrast silver Tertiary amino contrast increasers for ultrahigh contrast silver

1996-03-15

1998-07-21

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430600, 430603, G03C 110, G03C 529

Patent

active

057833575

ABSTRACT:
Silver halide recording material for the production of negative images with ultrahigh contrast.
Known silver halide recording materials for the production of negative images with ultrahigh contrast contain hydrazine compounds and contrast-increasing compounds (so-called boosters). A material with a new class of such boosters is being presented here, whereby they contain a sulfonyl urea, sulfonyl urethane or sulfuryl diamide group as well as a tertiary amino group in the molecule. The invention also comprises a process for the production of black-and-white negative images with ultrahigh contrast using the material according to the invention. It is especially useful for reproduction in the pre-press stage.

REFERENCES:
patent: 4975354 (1990-12-01), Machonkin et al.
patent: 5229248 (1993-07-01), Sanpei et al.

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