Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Patent
1986-03-31
1988-05-10
Shah, Mukund J.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
430218, 430219, 430544, 430607, 430955, 430957, G03C 108, G03C 726, G03C 102, G03C 106
Patent
active
047435330
ABSTRACT:
There is described a photographic system wherein development of an exposed photosensitive element with an aqueous alkaline photographic developing composition is effected in the presence of a compound represented by the formula ##STR1## wherein R is --OH, --OR.sub.4, --NH.sub.2 --NHR.sub.5 or --NR.sub.4 R.sub.6 ; R.sub.1 is hydrogen, --NH.sub.2, alkyl, substituted alkyl, aryl or substituted aryl; R.sub.2 and R.sub.3 each independently is hydrogen, alkyl, aralkyl or aryl; R.sub.4 is a protecting group which can be removed in the presence of a base; R.sub.5 is an activating group which can render the neighboring hydrogen atom acidic; R.sub.6 is an electron withdrawing group which is capable of stabilizing the negative charge on the nitrogen atom which is produced upon removal of R.sub.4 upon contact with alkali; and PHOTO is a photographically useful group.
The compounds provide controlled release of the photographically useful group by a base-catalyzed elimination when contacted by the aqueous aklaline processing composition.
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Boggs Roger A.
Mahoney John B.
Mehta Avinash C.
Schwarzel William C.
Taylor Lloyd D.
Maccarone Gaetano D.
Polaroid Corporation
Shah Mukund J.
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