Tellurium imaging composition

Claim 2

In a composition responsive to activating energy for forming an imaging film, which composition comprises (a) an image-forming tellurium compound; (b) a reductant precursor which will abstract labile hydrogen from a hydrogen donor under the influence of activating radiation to become a reducing agent with respect to the image-forming tellurium compound; (c) a source of labile hydrogen for reaction with said reductant precursor; and (d) a matrix in which said tellurium compound, reductant precursor and source of labile hydrogen are combined in amounts effective to form a composition which may be applied to a substrate, the improvement wherein there is included in said composition a masked reducing agent of the formula ##STR27## wherein R 1 is alkyl, alkanoyl, alkoxycarbonyl, phenyl, benzyl, benzoyl, nitrophenyl, benzylcarbonyl, diphenylmethyl, diphenylethyl, diphenylpropylcarbonyl or amino carbonyl; R 2 , R 3 and R 4 each and independently are hydrogen, alkyl, phenyl, or amino; and R 5 is phenyl, nitrophenyl, halophenyl, alkyl, mono-, di- or tri-haloacetyl, benzoyl, alkylphenyl, or alkyl-p-isocyanophenyl, said alkyl grouping in the radicals R 1 through R 5 having from 1 to 7 carbon atoms, and wherein Y is hydrogen or ##STR28## said compound containing at least one ##STR29## in said compound, the amount of said masked reducing agent being at least 1% by weight of said image-forming tellurium compound.

Claim 3

The improved image-forming composition according to claim 1, wherein there is additionally provided a diol of the formula ##STR30## wherein each of R 10 and R 11 independently represents hydrogen, a hydrocarbon group, including straight chain, branched chain and cyclic hydrocarbon groups, hydroxyalkyl groups, alkoxycarbonyl groups, cycloalkyl groups or aryl groups; and Z represents a direct C-C bond between the carbon atoms on either side of it, or an arylene group, the group (--C.tbd.C--), the group (--CR 12 ═CR 13 ) n , wherein n represents 1 or 2, and each of R 12 and R 13 represents hydrogen or an alkyl group or taken from part of a carbocyclic or heterocyclic ring, said diol being provided in an amount equivalent to at least 2 moles thereof per 1 mole of said tellurium forming compound.

Claim 4

The improved image-forming composition according to claim 1, wherein there is provided a diol of the formula R.sup.7 -X-CH.sub.2 -CHOH-CH.sub.2 OH wherein R 7 is alkyl, alkanoyl, thiazolinyl, alkenyl, benzyl, alkylbenzyl, alkoxybenzyl, hydroxyalkylbenzyl, and halobenzyl; the alkyl radical having from 1 to 7 carbon atoms; and X is oxygen or sulphur.

Claim 5

The improved image-forming composition according to claim 1, wherein said tellurium compound is selected from the group consisting of R.sub.x --Te--Hal.sub.y (Hal--R.sup.8).sub.x --Te--Hal.sub.y and TeCl.sub.n Br.sub.m in the foregoing formulae, R being an organic radical containing at least 1 carbonyl group, R 8 being the residue of an ethyleneic hydrocarbon, Hal being halogen, x being 1, 2 or 3; and x+y=4; n being an integer from 1 to 4 and m+n=4.

Claim 6

The improved image-forming composition according to claim 3, wherein said tellurium compound is selected from the group consisting of R.sub.x --Te--Hal.sub.y (Hal--R.sup.8).sub.x --Te--Hal.sub.y and TeCl.sub.n Br.sub.m in the foregoing formulae, R being an organic radical containing at least 1 carbonyl group, R 8 being the residue of an ethyleneic hydrocarbon; Hal being halogen, x being 1, 2 or 3, and x+y=4; n being an integer from 1 to 4 and m+n=4.

Claim 7

The improved image-forming composition according to claim 4 wherein said reductant precursor is selected from the group consisting of 2-isopropoxynaphthoquinone; 2-t-butyl-anthraquinone; 1,10-phenanthrenequinone; 1,1'-dibenzoylferrocene; 1-phenyl-1,2-propanedione; 2-hydroxy-1,4-naphthoquinone; benzil; furil; diacetylferrocene; acetylferrocene; 1,4-bis (phenyl glyoxal) benzene; o-naphthoquinone; 4,5-pyrinequinone; 4,5,9,10-pyrinequinone; benzophenone; acetophenone; 1,5-diphenyl-1,3,5-pentanetrione; ninhydrin; 4,4'-dibromobenzophenone; 1,8-dichloroanthraquinone; 1,2-benzanthraquinone; 2-methylanthraquinone; 1-chloroanthraquinone; 7,8,9,10-tetrahydronaphthacenequinone; 9,10-anthraquinone; and 1,4-dimethylanthraquinone.

Claim 8

The improved image-forming compound according to claim 5 wherein said reductant precursor is selected from the group consisting of 2-isopropoxynaphthoquinone; 2-t-butylanthraquinone; 1,10-phenanthrenequinone; 1,1'-dibenzoylferrocene; 1-phenyl-1,2-propanedione; 2-hydroxy-1,4-naphthoquinone; benzil; furil; diacetylferrocene; acetylferrocene; 1,4-bis (phenyl glyoxal) benzene; o-naphthoquinone; 4,5-pyrinequinone; 4,5,9,10-pyrinequinone; benzophenone; acetophenone; 1,5-diphenyl-1,3,5-pentanetrione; ninhydrin; 4,4'-dibromobenzophenone; 1,8-dichloroanthraquinone; 1,2-benzanthraquinone; 2-methylanthraquinone; 1-chloroanthraquinone; 7,8,9,10-tetrahydronaphthacenequinone; 9,10-anthraquinone; and 1,4-dimethylanthraquinone.

Claim 9

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR31##

Claim 10

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR32##

Claim 11

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR33##

Claim 12

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR34##

Claim 13

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR35##

Claim 14

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR36##

Claim 15

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR37##

Claim 16

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR38##

Claim 17

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR39##

Claim 18

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR40##

Claim 19

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR41##

Claim 20

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR42##

Claim 21

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR43##

Claim 22

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR44##

Claim 23

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR45##

Claim 24

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR46##

Claim 25

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR47##

Claim 26

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR48##

Claim 27

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR49##

Claim 28

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR50##

Claim 29

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR51##

Claim 30

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR52##

Claim 31

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR53##

Claim 32

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR54##

Claim 33

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR55##

Claim 34

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR56##

Claim 35

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR57##

Claim 36

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR58##

Claim 37

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR59##

Claim 38

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR60##

Claim 39

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR61##

Claim 40

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR62##

Claim 41

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR63##

Claim 42

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR64##

Claim 43

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR65##

Claim 44

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR66##

Claim 45

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR67##

Claim 46

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR68##

Claim 47

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR69##

Claim 48

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR70##

Claim 49

The improved image-forming composition according to one of claims 1-7 wherein said masked reducing agent is ##STR71##

Claim 50

In a film for forming an image comprising a composition on a substrate wherein said composition contains (a) an image-forming tellurium compound; (b) a reductant precursor which will abstract labile hydrogen from a hydrogen donor under the influence of activating radiation to become a reducing agent with respect to the image-forming tellurium compound; (c) a source of labile hydrogen for reaction with said reductant precursor; and (d) a matrix in which said tellurium compound, reductant precursor and source of labile hydrogen are combined in amounts effective to form a composition which may be applied to a substrate, the improvement wherein there is provided in said emulsion a masked reducing agent of the formula ##STR72## wherein R 1 is alkyl, alkanoyl, alkoxycarbonyl, phenyl, benzyl, benzoyl, nitrophenyl, benzylcarbonyl, diphenylmethyl, diphenylethyl, diphenylpropylcarbonyl or amino carbonyl; R 2 , R 3 and R 4 each and independently are hydrogen, alkyl, phenyl, or amino; and R 5 is phenyl, nitrophenyl, halophenyl, alkyl, mono-, di- or tri-haloalkyl, benzoyl, alkylphenyl, or alkyl-p-isocyanophenyl, said alkyl grouping in the radicals R 1 through R 5 having from 1 to 7 carbon atoms; and wherein Y is hydrogen or ##STR73## said compound containing at least one ##STR74## the amount of said masked reducing agent being at least 1% by weight of said image-forming tellurium compound.

Claim 51

In a film for forming an image comprising a composition on a substrate wherein said composition contains (a) an image-forming tellurium compound; (b) a reductant precursor which will abstract labile hydrogen from a hydrogen donor under the influence of activating radiation to become a reducing agent with respect to the image-forming tellurium compound; (c) a source of labile hydrogen for reaction with said reductant precursor; and (d) a matrix in which said tellurium compound, reductant precursor and source of labile hydrogen are combined in amounts effective to form a composition which may be applied to a substrate, the improvement wherein there is provided in said emulsion a masked reducing agent of the formula ##STR72## wherein R 1 is alkyl, alkanoyl, alkoxycarbonyl, phenyl, benzyl, benzoyl, nitrophenyl, benzylcarbonyl, diphenylmethyl, diphenylethyl, diphenylpropylcarbonyl or amino carbonyl; R 2 , R 3 and R 4 each and independently are hydrogen, alkyl, phenyl, or amino; and R 5 is phenyl, nitrophenyl, halophenyl, alkyl, mono-, di- or tri-haloalkyl, benzoyl, alkylphenyl, or alkyl-p-isocyanophenyl, said alkyl grouping in the radicals R 1 through R 5 having from 1 to 7 carbon atoms; and wherein Y is hydrogen or ##STR73## said compound containing at least one ##STR74## the amount of said masked reducing agent being at least 1% by weight of said image-forming tellurium compound.

Claim 52

The improved film according to claim 49, wherein there is additionally provided a diol of the formula ##STR75## wherein each of R 10 and R 11 independently represents hydrogen, a hydrocarbon group, including straight chain, branched chain and cyclic hydrocarbon groups, hydroxyalkyl groups, alkoxycarbonyl groups, cycloalkyl groups or aryl groups; and Z represents a direct C--C bond between the carbon atoms on either side of it, or the group (--C.tbd.C), the group (--CR 12 ═CR 13 ) n , wherein n represents a whole number, for example, 1 or 2, and each of R 12 and R 13 represents hydrogen or an alkyl group or taken from part of a carbocyclic or heterocyclic ring, said diol being provided in an amount equivalent to at least 2 moles thereof per 1 mole of said tellurium forming compound.

Claim 53

The improved film according to claim 49 wherein there is provided a diol of the formula R.sup.7 --X--CH.sub.2 --CHOH--CH.sub.2 OH wherein R 7 is alkyl, alkanoyl, thiazolinyl, alkenyl, benzyl, alkylbenzyl, alkoxybenzyl, hydroxyalkylbenzyl, and halobenzyl; the alkyl radical having from 1 to 7 carbon atoms; and X is oxygen or sulphur.

Claim 54

The improved film according to claim 49, 50 or 51, wherein said tellurium compound is selected from the group consisting of R.sub.x --Te--Hal.sub.y ; (Hal--R.sup.8).sub.x --Te--Hal.sub.y ; and TeCl.sub.n Br.sub.m in the foregoing formulae, R being an organic radical containing at least one carbonyl group, R 8 being the residue of an ethyleneic hydrocarbon, Hal being halogen, x being 1, 2 or 3; and x+y=4; n being an integer from 1 to 4 and m+n=4.

Claim 55

The improved film according to claim 52 wherein said reductant precursor is selected from the group consisting of 2-isopropoxynaphthoquinone; 2-t-butyl-anthraquinone; 1,10-phenanthrenequinone; 1,1'-dibenzoylferrocene; 1-phenyl-1,2-propanedione; 2-hydroxy-1,4-naphthoquinone; benzil; furil, diacetylferrocene; acetylferrocene; 1,4-bis (phenyl glyoxal) benzene; o-naphthoquinone; 4,5-pyrinequinone; 4,5,9,10-pyrinequinone; benzophenone; acetophenone; 1,5-diphenyl-1,3,5-pentanetrione; ninhydrin; 4,4'-dibromobenzophenone; 1,8-dichloroanthraquinone; 1,2-benzanthraquinone; 2-methylanthraquinone; 1-chloroanthraquinone; 7,8,9,10-tetrahydronaphthacenequinone; 9,10-anthraquinone; and 1,4-dimethylanthraquinone.

Claim 56

The improved film according to claim 53 wherein said reductant precursor is selected from the group consisting of 2-isopropoxynaphthoquinone; 2-t-butylanthraquinone; 1,10-phenanthrenequinone; 1,1'-dibenzoylferrocene; 1-phenyl-1,2-propanedione; 2-hydroxy-1,4-naphthoquinone; benzil; furil; diacetylferrocene; acetylferrocene; 1,4-bis (phenyl glyoxal) benzene; o-naphthoquinone; 4,5-pyrinequinone; 4,5,9,10-pyrinequinone; benzophenone; acetophenone; 1,5-diphenyl-1,3,5-pentanetrione; ninhydrin; 4,4'-dibromobenzophenone; 1,8-dichloroanthraquinone; 1,2-benzanthraquinone; 2-methyl-anthraquinone; 1-chloroanthraquinone; 7,8,9,10-tetrahydronaphthacenequinone; 9,10-anthraquinone; and 1,4-dimethylanthraquinone.

Claim 57

In a method for recording electromagnetic radiation, wherein said radiation impinges imagewise upon a photosensitive film to produce a change in at least one property thereof, which film is a photosensitive composition carried by a substrate, the photosensitive composition containing (a) an image-forming tellurium compound; (b) a reductant precursor which will abstract labile hydrogen from a hydrogen donor under the influence of activating radiation to become a reducing agent with respect to the image-forming tellurium compound; (c) a source of labile hydrogen for reaction with said reductant precursor; and (d) a matrix in which said tellurium compound, reductant precursor and source of labile hydrogen are combined in amounts effective to form a photosensitive composition which may be applied to a substrate, the improvement wherein there is included in said photosensitive composition a masked reducing agent of the formula ##STR76## wherein R 1 is alkyl, alkanoyl, alkoxycarbonyl, phenyl, benzyl, benzoyl, nitrophenyl, benzylcarbonyl, diphenylmethyl, diphenylethyl, diphenylpropylcarbonyl or amino carbonyl; R 2 , R 3 and R 4 each and independently are hydrogen, alkyl, phenyl, or amino; and R 5 is phenyl, nitrophenyl, halophenyl, alkyl, mono-, di- or tri-haloacetyl, benzoyl, alkylphenyl, or alkyl-p-isocyanophenyl, said alkyl grouping in the radicals R 1 through R 5 having from 1 to 7 carbon atoms, and wherein Y is H or ##STR77## there being at least one ##STR78## in said compound; the amount of said masked reducing agent being at least 1% by weight of said image-forming tellurium compound.

Claim 58

In a method for recording electromagnetic radiation, wherein said radiation impinges imagewise upon a photosensitive film to produce a change in at least one property thereof, which film is a photosensitive composition carried by a substrate, the photosensitive composition containing (a) an image-forming tellurium compound; (b) a reductant precursor which will abstract labile hydrogen from a hydrogen donor under the influence of activating radiation to become a reducing agent with respect to the image-forming tellurium compound; (c) a source of labile hydrogen for reaction with said reductant precursor; and (d) a matrix in which said tellurium compound, reductant precursor and source of labile hydrogen are combined in amounts effective to form a photosensitive composition which may be applied to a substrate, the improvement wherein there is included in said photosensitive composition a masked reducing agent of the formula ##STR76## wherein R 1 is alkyl, alkanoyl, alkoxycarbonyl, phenyl, benzyl, benzoyl, nitrophenyl, benzylcarbonyl, diphenylmethyl, diphenylethyl, diphenylpropylcarbonyl or amino carbonyl; R 2 , R 3 and R 4 each and independently are hydrogen, alkyl, phenyl, or amino; and R 5 is phenyl, nitrophenyl, halophenyl, alkyl, mono-, di- or tri-haloacetyl, benzoyl, alkylphenyl, or alkyl-p-isocyanophenyl, said alkyl grouping in the radicals R 1 through R 5 having from 1 to 7 carbon atoms, and wherein Y is H or ##STR77## there being at least one ##STR78## in said compound; the amount of said masked reducing agent being at least 1% by weight of said image-forming tellurium compound.

Claim 59

The improved method according to claim 56, wherein there is included in said photosensitive composition a diol of the formula ##STR79## wherein each of R 10 and R 11 independently represents hydrogen, a hydrocarbon group, including straight chain, branched chain and cyclic hydrocarbon groups, hydroxyalkyl groups, alkoxycarbonyl groups, cycloalkyl groups or aryl groups; and Z represents a direct C--C bond between the carbon atoms on either side of it, or an arylene group, the group (--C.tbd.C--), the group (--CR 12 ═CR 13 ) n , wherein n represents a whole number, for example 1 or 2, and each of R 12 and R 13 represents hydrogen or an alkyl group or taken from part of a carbocyclic or heterocyclic ring, said diol being provided in an amount equivalent to at least 2 moles thereof per 1 mole of said tellurium forming compound.

Claim 60

The improved method according to claim 55, wherein there is included in said photosensitive composition a diol of the formula R.sup.7 --X--CH.sub.2 --CHOH--CH.sub.2 OH wherein R 7 is alkyl, alkanoyl, thiazolinyl, alkenyl, benzyl, alkylbenzyl, alkoxybenzyl, hydroxyalkylbenzyl, and halobenzyl; the alkyl radical having from 1 to 7 carbon atoms; and X is oxygen or sulphur.

Claim 61

The improved method according to claim 56, wherein there is included in said photosensitive composition a tellurium compound selected from the group consisting of R.sub.x --Te--Hal.sub.y ; (Hal--R.sup.8).sub.x --Te--Hal.sub.y ; and TeCl.sub.n Br.sub.m in the foregoing formulae, R being an organic radical containing at least one carbonyl group, R 8 being the residue of an ethyleneic hydrocarbon, Hal being halogen, x being 1, 2 or 3; and x+y=4, n being an integer from 1 to 4 and m+n=4.

Claim 62

The improved method according to claim 57, wherein there is included in said photosensitive composition a tellurium compound selected from the group consisting of R.sub.x --Te--Hal.sub.y ; (Hal--R.sup.8).sub.x --Te--Hal.sub.y ; and TeCl.sub.n Br.sub.m in the foregoing formulae, R being an organic radical containing at least one carbonyl group, R 8 being the residue of an ethyleneic hydrocarbon, Hal being halogen, x being 1, 2 or 3, and x+y=4; n being an integer from 1 to 4, and m+n=4.

Claim 63

The improved method according to claim 58, wherein there is included in said photosensitive composition a reductant precursor selected from the group consisting of 2-isopropoxynaphthoquinone; 2-t-butylanthraquinone; 1,10-phenanthrenequinone; 1,1'-dibenzoylferrocene; 1-phenyl-1,2-propanedione; 2-hydroxy-1,4-naphthoquinone; benzil; furil; diacetylferrocene; acetylferrocene; 1,4-bis (phenyl glyoxal) benzene; o-naphthoquinone; 4,5-pyrinequinone; 4,5,9,10-pyrinequinone; benzophenone; acetophenone; 1,5-diphenyl-1,3,5-pentanetrione; ninhydrin; 4,4'-dibromobenzophenone; 1,8-dichloroanthraquinone; 1,2-benzanthraquinone; 2-methylanthraquinone; 1-chloroanthraquinone; 7,8,9,10-tetrahydronaphthacenequinone; 9,10-anthraquinone; and 1,4-dimethylanthraquinone.

Claim 64

The improved method according to claim 59, wherein there is included in said photosensitive composition a reductant precursor selected from the group consisting of 2-isopropoxynaphthoquinone; 2-t-butylanthraquinone; 1,10-phenanthrenequinone; 1,1'-dibenzoylferrocene; 1-phenyl-1,2-propanedione; 2-hydroxy-1,4-naphthoquinone; benzil, furil; diacetylferrocene; acetylferrocene; 1,4-bis (phenyl glyoxal) benzene; o-naphthoquinone; 4,5-pyrinequinone; 4,5,9,10-pyrinequinone; benzophenone; acetophenone; 1,5-diphenyl-1,3,5-pentanetrione; ninhydrin; 4,4'-dibromobenzophenone; 1,8-dichloroanthraquinone; 1,2-benzanthraquinone; 2-methylanthraquinone; 1-chloroanthraquinone; 7,8,9,10-tetrahydronaphthacenequinone; 9,10-anthraquinone; and 1,4-dimethylanthraquinone.

Claim 65

In an imaging method employing a reducible tellurium compound which may be decomposed by electrons to form tellurium and by-products reactive with amides, the tellurium compound being disposed in a film-like layer, the improvement comprising subjecting said layer imagewise to an activating energy in the form of free electrons having sufficient energy to reduce said tellurium compounds to free tellurium and by-products reactive with amides, and including in said film-like layer a masked reducing agent of the formula R.sup.1 --NY--NY.sub.2 ; ##STR80## wherein R.sup.1 is alkyl, alkanoyl, alkoxycarbonyl, phenyl, benzyl, benzoyl, nitrophenyl, benzylcarbonyl, diphenylmethyl, diphenylethyl, diphenylpropylcarbonyl or amino carbonyl; R.sup.2, R.sup.3 and R.sup.4 each and independently are hydrogen, alkyl, phenyl, or amino; and R.sup.5 is phenyl, nitrophenyl, halophenyl, alkyl, mono-, di- or tri-haloacetyl, benzoyl, alkylphenyl, or alkyl-p-isocyanophenyl, said alkyl grouping in the radicals R 1 through R 5 having from 1 to 7 carbon atoms, and wherein Y is hydrogen or ##STR81## said compound containing at least one ##STR82## in said compound, the amount of said masked reducing agent being at least 1% by weight of said image-forming tellurium compound.

Claim 66

In an imaging method employing a reducible tellurium compound which may be decomposed by electrons to form tellurium and by-products reactive with amides, the tellurium compound being disposed in a film-like layer, the improvement comprising subjecting said layer imagewise to an activating energy in the form of free electrons having sufficient energy to reduce said tellurium compounds to free tellurium and by-products reactive with amides, and including in said film-like layer a masked reducing agent of the formula R.sup.1 --NY--NY.sub.2 ; ##STR80## wherein R.sup.1 is alkyl, alkanoyl, alkoxycarbonyl, phenyl, benzyl, benzoyl, nitrophenyl, benzylcarbonyl, diphenylmethyl, diphenylethyl, diphenylpropylcarbonyl or amino carbonyl; R.sup.2, R.sup.3 and R.sup.4 each and independently are hydrogen, alkyl, phenyl, or amino; and R.sup.5 is phenyl, nitrophenyl, halophenyl, alkyl, mono-, di- or tri-haloacetyl, benzoyl, alkylphenyl, or alkyl-p-isocyanophenyl, said alkyl grouping in the radicals R 1 through R 5 having from 1 to 7 carbon atoms, and wherein Y is hydrogen or ##STR81## said compound containing at least one ##STR82## in said compound, the amount of said masked reducing agent being at least 1% by weight of said image-forming tellurium compound.

Claim 67

The improved method according to claim 62, wherein there is additionally provided in said film-like layer a diol of the formula ##STR83## wherein each of R 10 and R 11 independently represents hydrogen, a hydrocarbon group, including straight chain, branched chain and cyclic hydrocarbon groups, hydroxyalkyl groups, alkoxycarbonyl groups, cycloalkyl groups or aryl groups; and Z represents a direct C--C bond between the carbon atoms on either side of it, or an arylene group, the group (--C.tbd.C--), the group (--CR 12 ═CR 13 ) n , wherein n represents 1 or 2, and each of R 12 and R 13 represents hydrogen or an alkyl group or taken from part of a carbocyclic or heterocyclic ring, said diol being provided in an amount equivalent to at least 2 moles thereof per 1 mole of said tellurium forming compound.

Claim 68

The improved method according to claim 62 wherein there is included within said film-like layer a diol of the formula R.sup.7 --X--CH.sub.2 --CHOH--CH.sub.2 OH wherein R 7 is alkyl, alkanoyl, thiazolinyl, alkenyl, benzyl, alkylbenzyl, alkoxybenzyl, hydroxyalkylbenzyl, and halobenzyl; the alkyl radical having from 1 to 7 carbon atoms; and X is oxygen or sulphur.

Claim 69

The improved method according to claim 62, 63 or 64, wherein said tellurium compound is selected from the group consisting of R.sub.x --Te--Hal.sub.y ; (Hal--R.sup.8).sub.x --Te--Hal.sub.y ; and TeCl.sub.n Br.sub.m in the foregoing formulae, R being an organic radical containing at least 1 carbonyl group, R 8 being the residue of an ethyleneic hydrocarbon, Hal being halogen, x being 1, 2 or 3; and x+y=4; n being an integer from 1 to 4 and m+n=4.