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US 4,786,580 AGranted
Method of developing imaged diazo material with propanol containing developer composition
AssigneeHoechst Celanese Corporation
InventorsShane Hsieh, Wayne A. Mitchell
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Abstract
The invention provides a method for developing negative working photographic elements using an aqueous developer comprising (a) a solvent composition consisting essentially of (i) n-propanol or isopropanol; and (ii) a glycol ether or acetate (b) a salt which is preferably magnesium sulfate; and (c) an ethoxylated alkyl phenol type non-ionic surfactant.
Claims10
A method for developing imagewise light exposed negative working diazonium salt sensitized photographic elements by contacting said exposed element with an aqueous developer solution comprising:
- (a) a solvent solution composition consisting essentially of, in admixture:
- (i) from about 1% to about 28% by weight of the developer of at least one alcohol selected from the group consisting of n-propanol and isopropyl alcohol;
- and
- (ii) from about 5% to about 30% by weight of the developer of at least one component selected from the group consisting of propylene glycol mono methyl ether, propylene glycol mono propyl ether, ethylene glycol monophenyl ether, diethylene glycol mono ethyl ether, and diethylene glycol acetate, and
- (b) from about 1% to about 10% by weight of the developer of at least one salt selected from the group consisting of lithium magnesium potassium sodium and ammonium sulfates, phosphates and nitrates;
- and
- (c) from about 0.1% to about 2% by weight of the developer of at least one non-ionic surfactant selected from the group consisting of ethoxylated alkyl phenols.
4 more elements
Dependencies are inferred from the claim text.