High contrast photographic elements containing ballasted hydrophobic isothioureas

Claim 2

A silver halide photographic element adapted to form a high contrast image when development is carried out, in the presence of a hydrazine compound which functions as a nucleating agent, with an aqueous alkaline developing solution; said element comprising an amino compound which functions as an incorporated booster and, in an amount effective to inhibit pepper fog without unduly decreasing speed, contrast, or practical density point, a ballasted hydrophobic isothiourea compound which has a partition coefficient of at least one and which is represented by the formula: ##STR54## wherein R is a ballasting group containing at least six carbon atoms that is substantially free of solubilizing groups.

Claim 3

A photographic element as claimed in claim 1 wherein said ballasted hydrophobic isothiourea compound is represented by the formula: ##STR55## wherein R 1 is an alkyl group of 8 to 30 carbon atoms.

Claim 4

A photographic element as claimed in claim 1 wherein said ballasted hydrophobic isothiourea compound is represented by the formula: ##STR56## wherein n is 2 to 6 and R 2 and R 3 are alkyl groups of 2 to 6 carbon atoms.

Claim 5

A photographic element as claimed in claim 1 wherein said ballasted hydrophobic isothiourea compound is represented by the formula: ##STR57## wherein n is 2 to 6, m is 1 to 3, and R 4 is alkyl of 1 to 6 carbon atoms.

Claim 6

A photographic element as claimed in claim 1 wherein said ballasted hydrophobic isothiourea compound is represented by the formula: ##STR58## wherein A is an alkylene group of at least six carbon atoms.

Claim 7

A photographic element as claimed in claim 1 wherein said ballasted hydrophobic isothiourea compound is ##STR59##

Claim 8

A photographic element as claimed in claim 1 wherein said ballasted hydrophobic isothiourea compound is ##STR60##

Claim 9

A photographic element as claimed in claim 1 wherein said ballasted hydrophobic isothiourea compound is ##STR61##

Claim 10

A photographic element as claimed in claim 1 wherein said ballasted hydrophobic isothiourea compound is ##STR62##

Claim 11

A photographic element as claimed in claim 1 wherein said ballasted hydrophobic isothiourea compound is present in said element in an amount of from about 0.1 to about 10 millimoles per mole of silver.

Claim 12

A photographic element as claimed in claim 1 wherein said ballasted hydrophobic isothiourea compound is present in said element in an amount of from about 0.5 to about 2 millimoles per mole of silver.

Claim 13

A photographic element as claimed in claim 1 wherein said amino compound which functions as an incorporated booster is an amino compound which (1) comprises at least one secondary or tertiary amino group, (2) contains within its structure a group comprised of at least three repeating ethyleneoxy units, and (3) has a partition coefficient of at least one.

Claim 14

A photographic element as claimed in claim 1 wherein said hydrazine compound which functions as a nucleating agent is present in said element.

Claim 15

A photographic element as claimed in claim 13 wherein said hydrazine compound has the formula: ##STR63## where each R is an alkyl group, n is 1 to 3, X is an anion, m is 1 to 6, Y is a divalent aromatic radical, and R 1 is hydrogen or a blocking group.

Claim 16

A photographic element as claimed in claim 13 wherein said hydrazine compound has the formula: ##STR64## where R is a monovalent group comprised of at least three repeating ethyleneoxy units, m is 1 to 6, Y is a divalent aromatic radical, and R 1 is hydrogen or a blocking group.

Claim 17

A silver halide photographic element adapted to form a high contrast image upon development with an aqueous alkaline developing solution; said element comprising (1) from about 5×10 -4 to about 5×10 -2 moles per mole of silver of a hydrazine compound which functions as a nucleating agent, said hydrazine compound having the formula: ##STR65## where each R is alkyl of 1 to 12 carbon atoms, n is 1 to 3, X is chloride or bromide, and Y is phenylene; (2) from about 1 to about 25 millimoles per mole of silver of an amino compound which functions as an incorporated booster, said amino compound having the formula: ##STR66## wherein n is an integer with a value of 3 to 50, R 1 , R 2 , R 3 and R 4 are independently alkyl groups of 1 to 8 carbon atoms, R 1 and R 2 taken together and R 3 and R 4 taken together represent the atoms necessary to complete a heterocyclic ring, and (3) from about 0.1 to about 10 millimoles per mole of silver of an isothiourea compound which functions as a pepper fog restrainer, said isothiourea compound having a partition coefficient of at least one and the formula: ##STR67## wherein R is a ballasting group that contains at least six carbon atoms, and is substantially free of solubilizing groups.

Claim 18

A silver halide photographic element adapted to form a high contrast image upon development with an aqueous alkaline developing solution; said element comprising (1) from about 5×10 -4 to about 5×10 -2 moles per mole of silver of a hydrazine compound which functions as a nucleating agent, said hydrazine compound having the formula: ##STR65## where each R is alkyl of 1 to 12 carbon atoms, n is 1 to 3, X is chloride or bromide, and Y is phenylene; (2) from about 1 to about 25 millimoles per mole of silver of an amino compound which functions as an incorporated booster, said amino compound having the formula: ##STR66## wherein n is an integer with a value of 3 to 50, R 1 , R 2 , R 3 and R 4 are independently alkyl groups of 1 to 8 carbon atoms, R 1 and R 2 taken together and R 3 and R 4 taken together represent the atoms necessary to complete a heterocyclic ring, and (3) from about 0.1 to about 10 millimoles per mole of silver of an isothiourea compound which functions as a pepper fog restrainer, said isothiourea compound having a partition coefficient of at least one and the formula: ##STR67## wherein R is a ballasting group that contains at least six carbon atoms, and is substantially free of solubilizing groups.

Claim 19

A process for forming a high contrast photographic image which comprises imagewise exposing a silver halide photographic element and developing said exposed element, in the presence of a hydrazine compound which functions as a nucleating agent, with an aqueous alkaline photographic developing solution; said element comprising an amino compound which functions as an incorporated booster and, in an amount effective to inhibit pepper fog without unduly decreasing speed, contrast or practical density point, a ballasted hydrophobic isothiourea compound which has a partition coefficient of at least one and which is represented by the formula: ##STR68## wherein R is a ballasting group containing at least six carbon atoms that is substantially free of solubilizing groups.

Claim 20

A process for forming a high contrast photographic image which comprises imagewise exposing a silver halide photographic element and developing said exposed element, in the presence of a hydrazine compound which functions as a nucleating agent, with an aqueous alkaline photographic developing solution; said element comprising an amino compound which functions as an incorporated booster and, in an amount effective to inhibit pepper fog without unduly decreasing speed, contrast or practical density point, a ballasted hydrophobic isothiourea compound which has a partition coefficient of at least one and which is represented by the formula: ##STR68## wherein R is a ballasting group containing at least six carbon atoms that is substantially free of solubilizing groups.

Claim 21

A process as claimed in claim 17 wherein said ballasted hydrophobic isothiourea compound is ##STR69##

Claim 22

A process as claimed in claim 17 wherein said ballasted hydrophobic isothiourea compound is present in said element in an amount of from about 0.1 to about 10 millimoles per mole of silver.

Claim 23

A process as claimed in claim 17 wherein said hydrazine compound which functions as a nucleating agent is present in said element.

Claim 24

A process as claimed in claim 17 wherein said developing solution comprises a dihydroxybenzene developing agent.

Claim 25

A process as claimed in claim 17 wherein said developing solution comprises a dihydroxybenzene developing agent and an auxiliary super additive developing agent.

Claim 26

A process as claimed in claim 17 wherein said developing solution comprises hydroquinone and a 3-pyrazolidone developing agent.

Claim 27

A process as claimed in claim 17 wherein said developing solution contains a sulfite preservative.

Claim 28

A process as claimed in claim 17 wherein said developing solution contains a benzotriazole antifoggant.

Claim 29

A process for forming a high contrast photographic image which comprises image-wise exposing a silver halide photographic element and developing said exposed element with an aqueous alkaline photographic developing solution; said developing solution containing a dihydroxybenzene developing agent, an auxiliary super-additive developing agent and a sulfite preservative; said element containing: (1) from about 5×10 -4 to about 5×10 -2 moles per mole of silver of a hydrazine compound which functions as a nucleating agent, said hydrazine compound having the formula: ##STR70## where each R is alkyl of 1 to 12 carbon atoms, n is 1 to 3, X is chloride or bromide, and Y is phenylene; (2) from about 1 to about 25 millimoles per mole of silver of an amino compound which functions as an incorporated booster, said amino compound having the formula: ##STR71## wherein n is an integer with a value of 3 to 50, R 1 , R 2 , R 3 and R 4 are independently alkyl groups of 1 to 8 carbon atoms, R 1 and R 2 taken together and R 3 and R 4 taken together represent the atoms necessary to complete a heterocyclic ring, and (3) from about 0.1 to about 10 millimoles per mole of silver of an isothiourea compound which functions as a pepper fog restrainer, said isothiourea compound having a partition coefficient of at least one and the formula: ##STR72## wherein R is a ballasting group which contains at least six carbon atoms and is substantially free of solubilizing groups.

Claim 30

A process for forming a high contrast photographic image which comprises image-wise exposing a silver halide photographic element and developing said exposed element with an aqueous alkaline photographic developing solution; said developing solution containing a dihydroxybenzene developing agent, an auxiliary super-additive developing agent and a sulfite preservative; said element containing: (1) from about 5×10 -4 to about 5×10 -2 moles per mole of silver of a hydrazine compound which functions as a nucleating agent, said hydrazine compound having the formula: ##STR70## where each R is alkyl of 1 to 12 carbon atoms, n is 1 to 3, X is chloride or bromide, and Y is phenylene; (2) from about 1 to about 25 millimoles per mole of silver of an amino compound which functions as an incorporated booster, said amino compound having the formula: ##STR71## wherein n is an integer with a value of 3 to 50, R 1 , R 2 , R 3 and R 4 are independently alkyl groups of 1 to 8 carbon atoms, R 1 and R 2 taken together and R 3 and R 4 taken together represent the atoms necessary to complete a heterocyclic ring, and (3) from about 0.1 to about 10 millimoles per mole of silver of an isothiourea compound which functions as a pepper fog restrainer, said isothiourea compound having a partition coefficient of at least one and the formula: ##STR72## wherein R is a ballasting group which contains at least six carbon atoms and is substantially free of solubilizing groups.

Claim 31

A process for forming a high contrast photographic image which comprises imagewise exposing a silver halide photographic element and developing said exposed element with an aqueous alkaline photographic developing solution; said developing solution having a pH in the range of 9 to 10.8 and containing hydroquinone, a 3-pyrazolidone developing agent and a sulfite preservative; said element containing (1) from about 5×10 -4 to about 5×10 -2 moles per mole of silver of a hydrazine compound which functions as a nucleating agent, said hydrazine compound having the formula: ##STR73## (2) from about 1 to about 25 millimoles per mole of silver of an amino compound which functions as an incorporated booster, said amino compound having the formula: ##STR74## where Pr represents n-propyl, and (3) from about 0.1 to about 10 millimoles per mole of silver of an isothiourea compound which functions as a pepper fog restrainer, said isothiourea compound having the formula: ##STR75##

Claim 32

A process for forming a high contrast photographic image which comprises imagewise exposing a silver halide photographic element and developing said exposed element with an aqueous alkaline photographic developing solution; said developing solution having a pH in the range of 9 to 10.8 and containing hydroquinone, a 3-pyrazolidone developing agent and a sulfite preservative; said element containing (1) from about 5×10 -4 to about 5×10 -2 moles per mole of silver of a hydrazine compound which functions as a nucleating agent, said hydrazine compound having the formula: ##STR73## (2) from about 1 to about 25 millimoles per mole of silver of an amino compound which functions as an incorporated booster, said amino compound having the formula: ##STR74## where Pr represents n-propyl, and (3) from about 0.1 to about 10 millimoles per mole of silver of an isothiourea compound which functions as a pepper fog restrainer, said isothiourea compound having the formula: ##STR75##

Claim 33

A process for forming a high contrast photographic image which comprises imagewise exposing a silver halide photographic element and developing said exposed element with an aqueous alkaline photographic developing solution; said developing solution containing a dihydroxybenzene developing agent, an auxiliary super-additive developing agent and a sulfite preservative; said element containing: (1) from about 5×10 -4 to about 5×10 -2 moles per mole of silver of a hydrazine compound which functions as a nucleating agent, said hydrazine compound having the formula: ##STR76## where R is a monovalent group comprised of at least three repeating ethyleneoxy units, m is 1 to 6, Y is a divalent aromatic radical, and R 1 is hydrogen or a blocking group; (2) from about 1 to about 25 millimoles per mole of silver of an amino compound which functions as an incorporated booster, said amino compound having the formula: ##STR77## wherein n is an integer with a value of 3 to 50, R 1 , R 2 , R 3 and R 4 are independently alkyl groups of 1 to 8 carbon atoms, R 1 and R 2 taken together and R 3 and R 4 taken together represent the atoms necessary to complete a heterocyclic ring, and (3) from about 0.1 to about 10 millimoles per mole of silver of an isothiourea compound which functions as a pepper fog restrainer, said isothiourea compound having a partition coefficient of at least one and the formula: ##STR78## wherein R is a ballasting group which contains at least six carbon atoms and is substantially free of solubilizing groups.

Claim 34

A process for forming a high contrast photographic image which comprises imagewise exposing a silver halide photographic element and developing said exposed element with an aqueous alkaline photographic developing solution; said developing solution containing a dihydroxybenzene developing agent, an auxiliary super-additive developing agent and a sulfite preservative; said element containing: (1) from about 5×10 -4 to about 5×10 -2 moles per mole of silver of a hydrazine compound which functions as a nucleating agent, said hydrazine compound having the formula: ##STR76## where R is a monovalent group comprised of at least three repeating ethyleneoxy units, m is 1 to 6, Y is a divalent aromatic radical, and R 1 is hydrogen or a blocking group; (2) from about 1 to about 25 millimoles per mole of silver of an amino compound which functions as an incorporated booster, said amino compound having the formula: ##STR77## wherein n is an integer with a value of 3 to 50, R 1 , R 2 , R 3 and R 4 are independently alkyl groups of 1 to 8 carbon atoms, R 1 and R 2 taken together and R 3 and R 4 taken together represent the atoms necessary to complete a heterocyclic ring, and (3) from about 0.1 to about 10 millimoles per mole of silver of an isothiourea compound which functions as a pepper fog restrainer, said isothiourea compound having a partition coefficient of at least one and the formula: ##STR78## wherein R is a ballasting group which contains at least six carbon atoms and is substantially free of solubilizing groups.