Patent ID: 6610450
Filing Date: 2003-08-26
Classification: G03C,Y10S

Abstract:
An imaging element comprising an imaging layer having associated therewith a blocked color-forming agent in association with a phenolic activating agent, wherein the blocked color forming agent is represented by Structure I: wherein PUG is a photographically useful group that is a color-forming agent; TIME is a timing group; T represents t independently selected substituted or unsubstituted alkyl or aryl groups, t is 0, 1, or 2 and if t is 2, the T groups can form a ring; HET is a heterocyclic group which optionally can form a ring with a T group; R12 is hydrogen, substituted or unsubstituted alkyl or substituted or unsubstituted aryl, or R12 can form a ring with a T group or with HET; l is 0 or 1; m is 0, 1, or 2; and n is 0 or 1; where LINK 1 and LINK 2 are independently of Structure II: â€ƒwherein X represents carbon or sulfur; Y represents oxygen, sulfur or Nâ€”R1, where R1 is substituted or unsubstituted alkyl or substituted or unsubstituted aryl; p is 1 or 2; Z represents carbon, oxygen or sulfur; r is 0 or 1; with the proviso that when X is carbon, both p and r are 1, when X is sulfur, Y is oxygen, p is 2 and r is 0; # denotes the bond to PUG (for LINK 1) or TIME (for LINK 2): $ denotes the bond to TIME (for LINK 1) or T(t) substituted carbon (for LINK 2); wherein the phenolic activating agent for unblocking the color-forming agent of Structure I is represented by the following Structure IV: Arâ€”(OH)qâ€ƒâ€ƒ(IV) â€ƒwherein q&gE;1 and Ar is a substituted or unsubstituted aromatic group.