Patent ID: 7465342
Filing Date: 2008-12-16
Classification: G06F,G06K,G06Q,H04N

Abstract:
1. A method of minimizing absorption of visible light in an ink composition comprising an IR-absorbing metal-dithiolene dye, wherein the dye is preselected from a metal-dithiolene of formula (II): wherein: M is selected from Ni, Pd or Pt (preferably Ni); j is selected from 1, 2, 3 or 4; k is selected from 1, 2, 3 or 4; n is 0, 1, 2 or 3; W is selected from: a substituent comprising an ammonium group; a substituent comprising an acid group, including salts thereof, or a substituent comprising a sulfonamide group; up to three −(CH up to three —CH— groups in the carbocycle may be optionally replaced by —N—; and up to four H atoms in the carbocycle may be optionally replace by a group independently selected from C