Ink for inkjet printing, lithographic printing plate using it and method for making such plate

1. A method for inkjet printing comprising the following steps:

a step of providing a substrate comprising a metal selected from the group consisting of manganese, copper, chromium, zinc and nickel,

a step of ejecting an ink comprising at least a colorant, a polymerizable compound, a photopolymerization initiator, and a compound capable of forming a complex with the metal in the substrate, onto the substrate, and

a step of irradiating an ultraviolet ray to cure the ink to form a hydrophobic image on the substrate,

wherein the compound capable of forming a complex with a metal has two or more functional groups and is selected from the group consisting of phosphoric acid group-containing compounds, phosphonic acid group-containing compounds, amine group-containing compounds, carboxylic acid group-containing compounds, hydroxyl group-containing compounds, and sulfonic acid group-containing compounds.

2. The method of claim 1 , wherein the compound capable of forming a complex with a metal is selected from the group consisting of benzoic acid, iminodiacetic acid, N-(-hydroxyethyl)iminodiacetic acid, pyridine-2,6-dicarboxylic acid, 7-iodo-8-hydroxyquinoline-5-sulfonic acid, 2-amino-2-propylphosphonic acid, 1,2-dihydroxybenzene-4-sulfonic acid, tylone, sorochromiumviolet R, 3-hydroxy-2-naphthoic acid, oxalic acid, oxydiacetic acid, salicylic acid, 5-sulfosalicylic acid, 8-hydroxy-7-(arylazo) -quinoline-5-sulfonic acid, phenylserine, acetohydroxamic acid, 3-hydroxy-5,7-disulfo-2-naphthoic acid, 2,3-dihydroxynaphthalene-6-sulfonic acid, sulfoxine, oxine, acetylacetone, hexafluoroacetylacetone, benzoylacetone, 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedione, trifluoroacetylacetone, dibenzoylmethane, dipivaloylmethane, malonic acid, succinic acid, 3,4-dihydxoxybenzoic acid, gallic acid, 2-(3,4-dihydroxyphenyl)-2-(1,1 -benzopyran)-3,5,7-triol, 3-hydroxy-7-sulfo-2-naphthoic acid, 1,2-dihydroxynaphthalene-4-sulfonic acid, N,N-bis(2-hydroxyethyl)glycine, N-(phosphonomethyl)-iminodiacetic acid, N-(2-hydroxyethyl)-iminodiacetic acid, iminobis(methylenephosphonic acid), tartaric acid, l-oxopropane-1,2-dicarboxylic acid, propane-1,2,3-tricarboxylic acid, citric acid, desferrioxamine-B, 1,7-dihydroxy-4-sulfo-2-naphthoic acid, glutamic acid, pyridoxal-5-(dihydrophosphate), nitrilotriacetic acid, amino(phenyl)methylene-diphosphonic acid, ethylenebis[imino-2(-hydroxyphenyl)methylene(methyl)-phosphponic acid], N-(2-hydroxyethyl)-ethylenedinitrilo-N,N′,N′-triacetic acid, ethylenediaminetetraacetic acid, trimethylenedinitrilotetraacetic acid, cyclohexanediaminetetraacetic acid, (2-hydroxytrimethylene)-dinitrilotetraacetic acid, ethylenebis(oxyethylenenitrilo)tetraacetic acid, N,N,N′,N″,N″-diethylenetriamine-pentaacetic acid, N,N,N′,N″,N′″,N′″-tetraethylenetetramine -hexaacetic acid, semi-xylenol orange, semi-methylthymol blue, 3-hydxoxyglutamic acid, phosphoserine, amino-3-phosphopropionic acid, glyphosphate, phenylphosphonic acid, mono(2-methacryloyloxyethyl)acid phosphate and polyvinylphosphonic acid.

3. The method of claim 2 , wherein the compound capable of forming a complex with a metal is gallic acid, ethylenediamine tetraacetic acid or N-(phosphonomethyl)iminodiacetic acid.