Photothermographic material

1. A photothermographic material comprising:

a support;

a photosensitive silver halide in an amount of 0.05 to 0.3 g/m 2 , in terms of coated silver per m 2 of the photo sensitive material;

a non-photosensitive organic silver salt in an amount of 0.5 to 2.0 g/m 2 ;

a heat developer;

a binder; and

a fluorine compound present in an emulsion surface protective layer and a back surface protective layer,

wherein said fluorine compound is a compound represented by the following formula (B):

wherein

R 1 and R 2 independently are represented by the formula -La-Raf-W, wherein La represents a substituted or unsubstituted alkylene group, a substituted or unsubstituted alkyleneoxy group or a divalent group formed by combining these groups, Raf represents a perfluoroalkylene group having from 1 to 5 carbon atoms and W represents a hydrogen atom, a fluorine atom or an alkyl group;

X represents -L b -SO 3 M 0 , wherein M 0 represents a hydrogen atom or a cation, and L b represents a methylene group.

2. The photothermegraphie material as claimed in claim 1 , wherein said heat developer is represented by the following formula (R):

wherein R 11 and R 11 ′ each independently represents an alkylene group having from 1 to 20 carbon atoms, R 12 and R 12 ′ each independently represents a hydrogen atom or substituent capable of substituting to the benzene ring, L represents a —S— group or a —CHR 13 — group, R 13 represents a hydrogen atom or an alkyl group having from 1 to 20 carbon atoms, and X 1 and X 1 ′ each independently represents a hydrogen atom or a group capable of substituting to the benzene ring.

3. The photothermographic material as claimed in claim 1 , which comprises: an image-forming layer on the support; and a compound represented by the following formula (D) in the same surface side as the image-forming layer on the support:

wherein R 21 to R 23 each independently represents an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an amino group or a heterocyclic group, and these groups each may he unsubstituted or may have a substituent.

4. The photothermographic material as claimed in claim 1 , which comprises: an image-forming layer on the support; and a compound represented by the following formula (H) in the same surface side as the image-forming layer on the support:

Q-(Y) n —C(Z 1 ) (Z 2 )X  (H)

wherein Q represents an alkyl group, an aryl group or a heterocyclic group, Y represents a divalent linking group, n represents 0 or 1, Z 1 and Z 2 each represents a halogen group, and X represents a hydrogen atom or an electron-withdrawing group.

5. The photothermographic material as claimed in claim 2 , which comprises a development accelerator having an effect of accelerating development on said heat developer represented by formula (R).

6. The photothermographic material as claimed in claim 5 , wherein said development accelerator is a hydrazine compound.