Acidic photosensitive relief image-forming materials with indica

Details Acidic photosensitive relief image-forming materials with indica Acidic photosensitive relief image-forming materials with indica

1984-08-03

1986-03-25

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Diazo reproduction, process, composition, or product

Composition or product which contains radiation sensitive...

430157, 430164, 430165, 430167, 430175, 430176, 430188, 430143, 430191, 430196, 430270, 430280, 430281, 430286, 430289, 430292, 430293, 430294, 430271, G03C 160, G03C 171, G03C 168, G03C 176

Patent

active

045783411

ABSTRACT:
A relief image-forming composition having an acidic pH comprises a photosensitive component and an indicator capable of existing in two states differing in actinic opacity dependent upon pH. A relief image is formed by (1) exposing to light selected areas of a layer of the composition, the indicator being in its state of lower actinic opacity, (2) removing layer material from the exposed areas or from the unexposed areas and (3) shifting the pH in the remaining layer material to a value at which the indicator exists in its state of higher actinic opacity. The resultant image can then be used as an intermediate original in diazotype copying processes.

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Weast, Robert C., "Handbook of Chemistry and Physics", 53rd Edition, Chemical Rubber Co., 1972, D-106+107.
Dinaburg, M. S., "Photosensitive Diazo Cpds", Focal Press, 1964, p. 161 relied on.
Lange, N. A., "Handbook of Chemistry", 8th Ed., 1952, pp. 942-946.
Grant, J., "Hackh's Chemical Dictionary", 4th Ed., 1969, pp. 344-345.

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