Tellurium imaging composition
AssigneeEnergy Conversion Devices, Inc.
InventorsStanford R. Ovshinsky, Leon F. Hines, Ronald W. Citkowski, Terry T. Yu
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Abstract
This application relates to an imaging composition employing a tellurium compound sensitive to activating radiation. Such imaging compositions have been disclosed in a number of earlier patents, such as U.S. Pat. Nos. 4,142,896, 4,066,460 and 4,106,939. This application discloses improvements in masked reducing agents for such compositions. The improved masked reducing agents are compounds of the formulae ##STR1## wherein Y is hydrogen or ##STR2## said compound containing at least one ##STR3##
Claims65
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.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.sup.1 through R.sup.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.
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.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-haloalkyl, benzoyl, alkylphenyl, or alkyl-p-isocyanophenyl,
- said alkyl grouping in the radicals R.sup.1 through R.sup.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.
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.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.sup.1 through R.sup.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.
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.sup.10 and R.sup.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.sup.12 .dbd.CR.sup.13).sub.n, wherein n represents a whole number, for example 1 or 2, and each of R.sup.12 and R.sup.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.
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.sup.1 through R.sup.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.
Dependencies are inferred from the claim text.