C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
96/133, 260/312,
C07D 257/04 (2006.01) G03C 7/305 (2006.01) G03C 8/00 (2006.01)
Patent
CA 1325428
PHOTOGRAPHIC SYSTEM ABSTRACT OF THE DISCLOSURE There is described a photographic system wherein de- velopment of an exposed photosensitive element with an aqueous alkaline photographic developing composition is effected in the presence of a compound represented by the formula Image wherein R is -OH, -OR4, -NH2 -NHR5 or -NR4R6; R1 is hydrogen, -NH2, alkyl, substituted alkyl, aryl or substituted aryl; R2 and R3 each independently is hydrogen, alkyl, aralkyl or aryl; R4 is a protecting group which can be removed in the presence of a base; R5 is an activating group which can render the neighboring hydro- gen atom acidic; R6 is an electron withdrawing group which is capable of stabilizing the negative charge on the nitrogen atom which is produced upon removal of R4 upon contact with alkali; and PHOTO is a photographically useful group. The compounds provide controlled release of the photo- graphically useful group by a base-catalyzed elimination when contacted by the aqueous alkaline processing composition.
531693
Boggs Roger A.
Mahoney John B.
Mehta Avinash C.
Schwarzel William C.
Taylor Lloyd D.
Polaroid Corporation
Smart & Biggar
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