Patent ID: 7192476
Filing Date: 2007-03-20
Classification: C09D

Abstract:
1. A fluorescent water-based ink for ink-jet recording, comprising: a fluorescent dye having a xanthene skeleton; and a glycol; wherein: a difference in hydrophilic index log P between a substituent bonded to a C-9 carbon atom of the xanthene skeleton of the fluorescent dye and an other portion of the fluorescent dye is not less than 2.6; a distance between hydroxyl groups of the glycol is substantially equivalent to or longer than an interatomic distance between an atom directly bonded to a C-3 carbon atom of the xanthene skeleton and an atom directly bonded to a C-6 carbon atom of the xanthene skeleton; the fluorescent dye is C.I. Acid Red 92; and the glycol is polypropylene glycol #400.