Blocked photographically useful compounds in photographic compos

Details Blocked photographically useful compounds in photographic compos Blocked photographically useful compounds in photographic compos

1978-10-10

1982-01-12

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Transfer procedure between image and image layer, image...

Diffusion transfer process, element, or identified image...

430224, 430225, 430390, 430391, 430392, 430503, 430504, 430505, 430561, 430562, 430563, 430393, G03C 140, G03C 148, G03C 554, G03C 700

Patent

active

043106129

ABSTRACT:
Photographically useful compounds such as photographic reagents and photographic dyes are blocked with a grouping which, under alkaline conditions, is cleaved from the compound by an intramolecular nucleophilic displacement reaction. The compounds are resistant to unblocking under storage conditions, but are uniformly unblocked under conditions encountered during photographic processing.

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patent: 4156609 (1979-05-01), Landholm et al.

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