Claims
- 1. In a photosensitive, heat-developable, dry silver sheet material containing an image forming system including in one layer a photosensitive silver halide catalyst-forming means and, as heat image-forming means, an organic silver compound, said image-forming system further including toner and a reducing agent the oxidation-reduction reaction of which latter with said organic silver compound being catalyzed by silver halide catalyst; the improvement characterized by the inclusion in said layer with said organic silver compound of an acutance agent represented by the formula ##STR10## wherein: Z represents the atoms necessary to complete a mono-or polycyclic dihydroheterocyclic nucleus having 5 to 6 atoms in the ring including the N of the formula;
- R.sup.1 is an alkyl, substituted alkyl, alkenyl or aryl group;
- m = 0 or 1;
- k = 0, 1 or 2;
- T is an aprotic electron-withdrawing group having a .sigma..sub.para value of 0.45 to 0.63 selected from CF.sub.3 or CN and R.sup.2 and R.sup.3 are hydrogen or together constitute a condensed carbocyclic aromatic ring.
- 2. The dry silver sheet material of claim 1 wherein, in the acutance agent,
- Z is a member of the group:
- --CH.dbd.CH--, --CH.dbd.CH--CH.dbd.CH--, ##STR11## where R.sup.4 is H, alkyl of 1-2 carbon atoms or alkoxy of 1-2 carbon atoms.
- 3. The dry silver sheet material of claim 1 wherein, in the acutance agent, R.sup.1 is alkyl of 1 to 4 carbon atoms.
- 4. The dry silver sheet material of claim 1 wherein the reducing agent is in the same layer as the organic silver compound.
- 5. The dry silver sheet material of claim 1 wherein the image forming system includes the reducing agent and toner in a separate layer.
Parent Case Info
This is a continuation-in-part of application Ser. No. 687,003 filed on 05/17/76, now U.S. Pat. No. 4,033,948.
US Referenced Citations (4)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
687003 |
May 1976 |
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