Stabilized color developing compositions and methods of using same
AssigneeEastman Kodak Company
InventorsShirleyanne Haye, Janet Huston
Life of this patent
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Abstract
Color developing compositions for photoprocessing of color photographic materials are stabilized by the presence of an organic antioxidant and a stabilizing compounds having the following Structure (I): [(R1)(R2)N]m-L-[SO3−M+]n (I) wherein R1 and R2 are independently hydrogen or a monovalent aliphatic, heterocyclic, or aromatic group, or R1 and R2 are taken together with the nitrogen to which they are attached to form a substituted or unsubstituted 5- to 6-membered heterocyclic ring, m is 0 or 1 such that when m is 0, L is an alkyl or aryl group and when m is 1, L is an alkylene or arylene linking group, M+ is a suitable cation to provide a salt, and n is 1, 2, or 3.
Claims20
A color developing composition having a pH greater than 7 and comprising:
- a) at least 0.0005 mol/l of a color developing agent,
- b) at least 0.0005 mol/l of an organic antioxidant for said color developing agent, and
- c) at least 0.0005 mol/l of a stabilizing compound represented by the following Structure (I):
- [(R1)(R2)N]m-L-[SO3−M+]n (I)
- wherein R1 and R2 are independently hydrogen or a monovalent aliphatic, heterocyclic, or aromatic group, or R1 and R2 are taken together with the nitrogen to which they are attached to form a substituted or unsubstituted 5- to 6-membered heterocyclic ring, m is 0 or 1 such that when m is 0, L is an alkyl or aryl group and when m is 1, L is an alkylene or arylene linking group, M+ is a suitable cation to provide a salt, and n is 1, 2, or 3.
A homogeneous, aqueous single-part color developing composition having a pH of from about 8 to about 14 and comprising:
- a) from about 0.0005 to about 1 mol/l of a color developing agent in free base form,
- b) from about 0.0005 to about 1 mol/l of a hydroxylamine derivative antioxidant for said color developing agent,
- c) a water-miscible or water-soluble hydroxy-substituted, straight-chain organic solvent that has a molecular weight of from about 50 to about 200,
- d) a buffering agent that is soluble in said organic solvent, and
- e) at least 0.0005 mol/l of a stabilizing compound represented by the following Structure (I):
- [(R1)(R2)N]m-L-[SO3−M+]n (I)
- wherein R1 and R2 are independently hydrogen or a monovalent aliphatic, heterocyclic, or aromatic group, or R1 and R2 are taken together with the nitrogen to which they are attached to form a substituted or unsubstituted 5- to 6-membered heterocyclic ring, m is 0 or 1 such that when m is 0, L is an alkyl or aryl group and when m is 1, L is an alkylene or arylene linking group, M+ is a suitable cation to provide a salt, and n is 1, 2, or 3.
A multi-part color developing composition kit comprising:
- (I) a first aqueous solution having a pH of from about 9 to about 13,
- (II) a second aqueous solution having a pH of from about 3 to about 7 and comprising:
- (a) at least 0.0005 mol/l of a color developing agent,
- (b) at least 0.0005 mol/l of an organic antioxidant for said color developing agent, and
- (c) at least 0.0001 mol/l of sulfite ions,
- (III) an optional third aqueous solution having a pH of from about 10 to about 13.5,
- wherein one or more of said first or second aqueous solutions further comprises:
- (d) at least 0.0005 mol/l of a stabilizing compound represented by the following Structure (I):
- [(R1)(R2)N]m-L-[SO3−M+]n (I)
- wherein R1 and R2 are independently hydrogen or a monovalent aliphatic, heterocyclic, or aromatic group, or R1 and R2 are taken together with the nitrogen to which they are attached to form a substituted or unsubstituted 5- to 6-membered heterocyclic ring, m is 0 or 1 such that when m is 0, L is an alkyl or aryl group and when m is 1, L is an alkylene or arylene linking group, M+ is a suitable cation to provide a salt, and n is 1, 2, or 3.
A color developing composition having a pH greater than 7 and comprising at least 0.0005 mol/l of a color developing agent, and at least 0.0005 mol/l of a stabilizing compound represented by the following Structure (I):
- [(R1)(R2)N]m-L-[SO3−M+]n (I)
- wherein R1 and R2 are independently hydrogen or a monovalent aliphatic, heterocyclic, or aromatic group, or R1 and R2 are taken together with the nitrogen to which they are attached to form a substituted or unsubstituted 5- to 6-membered heterocyclic ring, m is 0 or 1 such that when m is 0, L is an alkyl or aryl group and when m is 1, L is an alkylene or arylene linking group, M+ is a suitable cation to provide a salt, m is 0 or 1, and n is 1, 2, or 3.
A method for providing a color image in a color photographic silver halide element comprising contacting said element with an aqueous photographic color developing composition having a pH of from about 7 to about 14 and comprising:
- a) at least 0.0005 mol/l of a color developing agent,
- b) at least 0.0005 mol/l of an organic antioxidant for said color developing agent, and
- c) at least 0.0005 mol/l of a stabilizing compound represented by the following Structure (I):
- [(R1)(R2)N]m-L-[SO3−M+]n (I)
- wherein R1 and R2 are independently hydrogen or a monovalent aliphatic, heterocyclic, or aromatic group, or R1 and R2 are taken together with the nitrogen to which they are attached to form a substituted or unsubstituted 5- to 6-membered heterocyclic ring, m is 0 or 1 such that when m is 0, L is an alkyl or aryl group and when m is 1, L is an alkylene or arylene linking group, M+ is a suitable cation to provide a salt, and n is 1, 2, or 3.
A method of photographic processing comprising the steps of:
- A) color developing an imagewise exposed color photographic silver halide element with a photographic color developing composition having a pH of from about 7 to about 14 and comprising:
- a) at least 0.0005 mol/l of a color developing agent,
- b) at least 0.0005 mol/l of an organic antioxidant for said color developing agent, and
- c) at least 0.0005 mol/l of a stabilizing compound represented by the following Structure (I):
- [(R1)(R2)N]m-L-[SO3−M+]n (I)
- wherein R1 and R2 are independently hydrogen or a monovalent aliphatic, heterocyclic, or aromatic group, or R1 and R2 are taken together with the nitrogen to which they are attached to form a substituted or unsubstituted 5- to 6-membered heterocyclic ring, m is 0 or 1 such that when m is 0, L is an alkyl or aryl group and when m is 1, L is an alkylene or arylene linking group, M+ is a suitable cation to provide a salt, and n is 1, 2, or 3, and
- B) desilvering said color developed color photographic silver halide element.
Dependencies are inferred from the claim text.