Patent ID: 7204941

Claim:
An IR-absorbing dye suitable for formulating a water-based inkjet ink, said dye being of formula (I): wherein: M is selected from Ni, Pd or Pt; R 10 and R 11 are independently selected from C 1-30 hydrocarbyl, or R 10 and R 11 together are joined to form a C 2-30 hydrocarbylene group; R 12 and R 13 are independently selected from C 1-30 hydrocarbyl, or R 12 and R 13 together are joined to form a C 2-30 hydrocarbylene group; wherein at least one of R 10 , R 11 , R 12 or R 13 comprises a hydrophilic group, and wherein said hydrophilic group is selected from an ammonium group; an acid group, including salts thereof; or a sulfonamide group.