Photographic coupler capable of releasing a photographically use

Details Photographic coupler capable of releasing a photographically use Photographic coupler capable of releasing a photographically use

1997-06-10

1999-06-15

Letscher, Geraldine

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Identified radiation sensitive composition with color...

430543, 430955, 430956, 430957, 430958, 430959, 430960, G03C 108, G03C 726, G03C 732

Patent

active

059121106

ABSTRACT:
A photographic element comprising a support having situated thereon at least one silver halide emulsion layer, the layer containing a photographic coupler represented by the formula ##STR1## wherein COUP is a coupler moiety having a coupling site to which T.sup.1 is attached;
T.sup.1 is a timing or linking group which releases from COUP during processing and which functions by electron transfer down a conjugated chain, or by nucleophilic displacement reaction, to release from HETERO;
HETERO is a heterocyclic group containing at least two heteroatoms independently selected from oxygen, nitrogen, or sulfur, wherein one of the heteroatoms is directly attached to T.sup.1 ;
R.sup.1 and R.sup.2 are independently selected from hydrogen, or an aliphatic, carbocyclic, or heterocyclic group, or may be bonded together to form a 5, 6, or 7 membered ring; and
PUG is a photographically useful group.

REFERENCES:
patent: 4248962 (1981-02-01), Lau
patent: 4409323 (1983-10-01), Sato et al.
patent: 4861701 (1989-08-01), Burns et al.
patent: 5670301 (1997-09-01), Begley et al.
patent: 5686234 (1997-11-01), Begley et al.

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