Patent ID: 8399545

Claim:
An aqueous ink for inkjet recording, comprising vinyl polymer particles containing A and B and a water-soluble solvent: A: an azo pigment represented by the following formula (1), its tautomer, or a salt or hydrate thereof; B: a vinyl polymer containing (a) a hydrophobic structural unit having an aromatic ring bonded to the polymer main chain through a linking group and (b) a hydrophilic structural unit: wherein Q represents a 5- to 7-membered heterocyclic ring together with the carbon atoms, W represents an alkoxy group, an amino group, an alkyl group or an aryl group, X 1 and X 2 each independently represents a hydrogen atom, an alkyl group, an acyl group, an alkylsulfonyl group or an aryl sulfonyl group, R 1 represents a hydrogen atom or a substituent, R 2 represents a heterocyclic group, n represents an integer of 1 to 4, and the formula represents a dimer through Q, W, X 1 , X 2 , R 1 or R 2 when n=2, and the formula represents a trimer through Q, W, X 1 , X 2 , R 1 or R 2 when n=3, and the formula represents a tetramer through Q, W, X 1 , X 2 , R 1 or R 2 when n=4; and wherein the hydrophobic structural unit (a) contains (a1) a hydrophobic structural unit represented by the following formula (I): wherein R 1 in formula (I) represents a hydrogen atom, a methyl group or a halogen atom, L 1 represents —COO—, —OCO—, —CONR 2 —, —O— or a substituted or unsubstituted phenylene group, R 2 represents a hydrogen atom or an alkyl group, L 2 represents a single bond or a divalent linking group, and Ar 1 represents a monovalent group derived from an aromatic ring.