Heat developable photosensitive composition and a heat developable photosensitive member having a layer comprising the composition

Claim 2

A heat developable photosensitive composition adapted to form metallic silver grains at exposed portions in cooperation with a reducing agent comprising an organic silver salt, a halide and, as a compound to enhance formation of metallic silver grains at exposed portions and suppress formation of metallic silver grains at non-exposed portions, at least one member of sulfur compounds having the formula (1): ##STR91## in which Y is selected from the class of hydrogen, alkyl, unsubstituted or substituted phenyl, aralkyl and ##STR92## wherein R 7 is benzyl, Z is one or more atoms necessary for forming a 5- or 6-membered heterocyclic ring which may be substituted or unsubstituted.

Claim 3

A heat developable photosensitive composition according to claim 1 in which Y is an alkyl having 1-6 carbon atoms.

Claim 4

A heat developable photosensitive composition according to claim 1 in which Y is benzyl.

Claim 5

A heat developable photosensitive composition according to claim 1 in which the sulfur compound is contained in an amount of 10 -4 -10 -1 part by weight per one part by weight of the organic silver salt.

Claim 6

A heat developable photosensitive composition according to claim 1 in which the sulfur compound is contained in an amount of 5×10 -4 -10 -2 parts by weight per one part by weight of the organic silver salt.

Claim 7

A heat developable photosensitive member adapted to form metallic silver grains at exposed portions comprising a layer containing a reducing agent and a layer containing an organic silver salt, a halide, an insulating medium and as a compound to enhance formation of metallic silver grains at exposed portions and suppress formation of metallic silver grains at non-exposed portions, at least one member of sulfur compounds having the formula (1): ##STR93## in which Y is selected from the class of hydrogen, alkyl, having 1-6 carbon atoms, unsubstituted or substituted phenyl, benzyl ##STR94## wherein R 7 is benzyl, Z is one or more atoms necessary for forming a 5- or 6-membered heterocyclic ring which may be substituted or unsubstituted, the former layer overlying the latter layer.

Claim 8

A heat developable photosensitive member adapted to form metallic silver grains at exposed portions comprising a layer containing a reducing agent and a layer containing an organic silver salt, a halide, an insulating medium and as a compound to enhance formation of metallic silver grains at exposed portions and suppress formation of metallic silver grains at non-exposed portions, at least one member of sulfur compounds having the formula (1): ##STR93## in which Y is selected from the class of hydrogen, alkyl, having 1-6 carbon atoms, unsubstituted or substituted phenyl, benzyl ##STR94## wherein R 7 is benzyl, Z is one or more atoms necessary for forming a 5- or 6-membered heterocyclic ring which may be substituted or unsubstituted, the former layer overlying the latter layer.

Claim 9

A heat developable photosensitive member according to claim 6 in which the sulfur compound is contained in an amount of 10 -4 -10 -1 part by weight per one part by weight of the organic silver salt.

Claim 10

A heat developable photosensitive member according to claim 6 in which the sulfur compound is contained in an amount of 5×10 -4 -10 -2 parts by weight per one part by weight of the organic silver salt.

Claim 11

A heat developable photosensitive member according to claim 6 in which the insulating medium is contained in an amount of 0.02-20 parts by weight per one part by weight of the organic silver salt.

Claim 12

A heat developable photosensitive member according to claim 6 in which the insulating medium is contained in an amount of 0.1-5 parts by weight per one part by weight of the organic silver salt.

Claim 13

A heat developable photosensitive member according to claim 6 in which the total thickness of both layers is 1-50 microns.

Claim 14

A heat developable photosensitive member according to claim 6 in which the total thickness of both layers is 2-30 microns.

Claim 15

A heat developable photosensitive member adapted to form metallic silver grains at exposed portions which comprises a layer containing a halide and a reducing agent and a layer containing an organic silver salt, an insulating medium and as a compound to enhance formation of metallic silver grains at exposed portions and suppress formation of metallic silver grains at non-exposed portions, at least one member of sulfur compounds having the following formula (1): ##STR95## in which Y is selected from the class of hydrogen, alkyl having 1-6 carbon atoms, unsubstituted or substituted phenyl, benzyl ##STR96## wherein R 7 is benzyl, Z is one or more atoms necessary for forming a 5- or 6-membered heterocyclic ring which may be substituted or unsubstituted, the former layer overlying the latter layer.

Claim 16

A heat developable photosensitive member adapted to form metallic silver grains at exposed portions which comprises a layer containing a halide and a reducing agent and a layer containing an organic silver salt, an insulating medium and as a compound to enhance formation of metallic silver grains at exposed portions and suppress formation of metallic silver grains at non-exposed portions, at least one member of sulfur compounds having the following formula (1): ##STR95## in which Y is selected from the class of hydrogen, alkyl having 1-6 carbon atoms, unsubstituted or substituted phenyl, benzyl ##STR96## wherein R 7 is benzyl, Z is one or more atoms necessary for forming a 5- or 6-membered heterocyclic ring which may be substituted or unsubstituted, the former layer overlying the latter layer.

Claim 17

A heat developable photosensitive member according to claim 13 in which the sulfur compound is contained in an amount of 10 -4 -10 -1 part by weight per one part by weight of the organic silver salt.

Claim 18

A heat developable photosensitive member according to claim 13 in which the sulfur compound is contained in an amount of 5×10 -4 -10 -2 parts by weight per one part by weight of the organic silver salt.

Claim 19

A heat developable photosensitive member according to claim 13 in which the insulating medium is contained in an amount of 0.02-20 parts by weight per one part by weight of the organic silver salt.

Claim 20

A heat developable photosensitive member according to claim 13 in which the insulating medium is contained in an amount of 0.1-5 parts by weight per one part by weight of the organic silver salt.

Claim 21

A heat developable photosensitive member according to claim 13 in which the total thickness of both layers is 1-50 microns.

Claim 22

A heat developable photosensitive member according to claim 13 in which the total thickness of both layers is 2-30 microns.

Claim 23

A heat developable photosensitive member adapted to form metallic silver grains at exposed portions which comprises a layer containing an organic silver salt, a halide and an insulating medium and a layer containing a reducing agent and as a compound to enhance formation of metallic silver grains at exposed portions and suppress formation of metallic silver grains at non-exposed portions, at least one member of sulfur compounds having the following formula (1): ##STR97## in which Y is selected from the class of hydrogen, alkyl having 1-6 carbon atoms, unsubstituted or substituted phenyl, benzyl and ##STR98## wherein R 7 is benzyl, Z is one or more atoms necessary for forming a 5- or 6-membered heterocyclic ring which may be substituted or unsubstituted, the latter laying overlying the former layer.

Claim 24

A heat developable photosensitive member adapted to form metallic silver grains at exposed portions which comprises a layer containing an organic silver salt, a halide and an insulating medium and a layer containing a reducing agent and as a compound to enhance formation of metallic silver grains at exposed portions and suppress formation of metallic silver grains at non-exposed portions, at least one member of sulfur compounds having the following formula (1): ##STR97## in which Y is selected from the class of hydrogen, alkyl having 1-6 carbon atoms, unsubstituted or substituted phenyl, benzyl and ##STR98## wherein R 7 is benzyl, Z is one or more atoms necessary for forming a 5- or 6-membered heterocyclic ring which may be substituted or unsubstituted, the latter laying overlying the former layer.

Claim 25

A heat developable photosensitive member according to claim 20 in which the sulfur compound is contained in an amount of 10 -4 -10 -1 part by weight per one part by weight of the organic silver salt.

Claim 26

A heat developable photosensitive member according to claim 20 in which the sulfur compound is contained in an amount of 5×10 -4 -10 -2 part by weight per one part by weight of the organic silver salt.

Claim 27

A heat developable photosensitive member according to claim 20 in which the insulating medium is contained in an amount of 0.02-20 parts by weight per one part by weight of the organic silver salt.

Claim 28

A heat developable photosensitive member according to claim 20 in which the insulating medium is contained in an amount of 0.1-5 parts by weight per one part by weight of the organic silver salt.

Claim 29

A heat developable photosensitive member according to claim 20 in which the total thickness of both layers is 1-50 microns.

Claim 30

A heat developable photosensitive member according to claim 20 in which the total thickness of both layers is 2-30 microns.

Claim 31

Method for forming silver images comprising (a) imagewise exposing the heat developable photosensitive member of claim 6 and; (b) thereafter, heat developing said exposed member to form a silver image of high contrast and stability.