Patent ID: 7052534
Filing Date: 2006-05-30
Classification: C09D

Abstract:
1. An ink for inkjet recording, comprising a dye, water, a water-miscible organic solvent and a precursor of acid; wherein the precursor of acid is a compound showing no acidity at the time of preparation and storage of the ink, but is capable of releasing acids by a reaction after aging or printing, or is capable of rendering the ink system acidic as a result of the reaction, and the precursor of acid includes at least one compound represented by the following formulae (1) to (2): wherein R 101 represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a heterocyclic group, an amino group, an alkoxy group, an aryloxy group, an alkylthio group or an arylthio group, and the groups may have a substituent; R R X Y Z represents atoms capable of forming an aromatic heterocyclic ring; Q represents a halogen atom, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, an amino group, an acyloxy group, an alkylsulfonyloxy group or an arylsulfonyloxy group: W represents a carbon atom or a nitrogen atom; Q has the same definition as described above; R R Q has the same definition as described above; R R the ink comprises the precursor of acid in an amount of 0.01 to 20 wt %.