Imaging element containing a blocked photographically useful compound
AssigneeEastman Kodak Company
InventorsWojciech K. Slusarek, Xiqiang Yang, David H. Levy
Life of this patent
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Abstract
Blocked photographically useful groups decompose thermally via a Lossen rearrangement reaction, including, for example, compounds represented by the following structure: In the above structure, the substituents are as defined in the application. Such compounds have good reactivity and can by used to block photographically useful compounds such as developing agents until thermally activated under preselected conditions. Compounds according to the present invention are especially useful in color photothermographic imaging elements.
Claims31
An imaging element comprising an imaging layer having associated therewith a compound represent by the following structure:
- wherein:
- PUG is a photographically useful group connected to the rest of the molecule via a heteroatom;
- TIME is a timing group;
- l is 0 or 1;
- m is 0 or 1;
- provided that when m=0 then 1=0;
- X is carbon atom, aryl group or heteroaromatic group;
- and
- Y is z independently selected substituents, electron donating or electron withdrawing, and z is 0 to 7;
- and wherein additionally two substituents Y can join to form a ring;
- and
- wherein LINK1 and LINK2 are linking groups independently having the following structure:
- wherein
- X represents carbon or sulfur;
- Y represents oxygen, sulfur or N—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;
- $ denotes the bond to TIME.
Dependencies are inferred from the claim text.