Patent ID: 6620577
Filing Date: 2003-09-16
Classification: G03C,Y10S

Abstract:
A photothermographic material comprising a support having thereon one or more layers comprising a binder and in reactive association:a. a preformed photosensitive silver halide, b. a non-photosensitive source of reducible silver ions, c. a reducing composition for said reducible silver ions, and d. a selenium chemical sensitizer represented by the following Structures I, II, or III: Se(L)m(X1)nâ€ƒâ€ƒI M(Lâ€²)s(X2)râ€ƒâ€ƒII (Z)wMâ€²xSey(CO)zâ€ƒâ€ƒIII â€ƒwherein X1 and X2 independently represent halo, CN, SCN, SeCN, TeCN, N3, BF4, ClO4, BPh4, PF6, NO3, SO3CF3, Ra, Rb, O(C&boxH;O)CF3, S(C&boxH;S)N(Ra)(Rb), S(C&boxH;S)ORa, S(C&boxH;S)SRa, S(P&boxH;S)(ORa)(ORb), S(P&boxH;S)(Ra)(Rb), SRa, SeRa, TeRaORa, or O(C&boxH;O)Ra groups, Ra and Rb independently represent alkyl, alkenyl, cycloalkyl, heterocyclyl, or aryl groups, or Ra and Rb taken together can form a 5-, 6- or 7-membered heterocyclic ring, L is a ligand derived from a neutral Lewis base, m is 0, 1, 2, 3, or 4 and n is 2 or 4 with the proviso that when m is 0, n is 2 or 4, and when m is 0 and n is 2, then X1 is not Ra, Rb , or RaSe, M represents Cu(1+), Pd(2+), or Pt(2+), Lâ€² represents a neutral ligand with a Group 15 atom or a Group 16 atom, provided that at least one of Lâ€² or X2 contains a selenium atom, r is 1 or 2 and s is 1, 2, 3, or 4 such that when M represents Cu(1+), r is 1 and when M represents Pd(2+) or Pt(2+), r is 2, Z represents a monovalent cation, Mâ€² represents Fe, Ru, Os, Co, Rh, or Ir, x is an integer of from 1 to 6, y is an integer of from 1 through 6, z is an integer of from 6 through 20, w is an integer inclusive of from 0 through 4 and represents the number of Z groups necessary to neutralize the electronic charge on the rest of the compound, and further provided that multiple X1, X2, L, Lâ€², Ra, Rb, groups in the molecule can be the same or different.