Patent ID: 7122076

Claim:
An IR-absorbing naphthalocyanine dye of formula (I), said dye being contained in an water-based inkjet ink: wherein M is selected from Si(A 1 )(A 2 ), Ge(A 1 )(A 2 ), Ga(A 1 ), Mg, Al(A 1 ), TiO, Ti(A 1 )(A 2 ), ZrO, Zr(A 1 )(A 2 ), VO, V(A 1 )(A 2 ), Mn, Mn(A 1 ), Fe, Fe(A 1 ), Co, Ni, Cu, Zn, Sn, Sn(A 1 )(A 2 ), Pb, Pb(A 1 )(A 2 ), Pd and Pt A 1 and A 2 are axial ligands, which may be the same or different, and are selected from —OH, halogen or; —OR 3 ; R 1 and R 2 are selected from H or C 1-12 alkoxy; R 3 is selected from C 1-12 alkyl, C 1-12 aryl, C 5-12 arylalkyl or Si(R x )(R y )(R z ); and R x , R y and R z may be the same or different and are selected from C 5-12 alkyl, C 5-12 aryl, C 5-12 arylalkyl, C 1-12 alkoxy, C 5-12 aryloxy or C 5-12 arylalkoxy; W is selected from a sulfonic acid group (including salts thereof) or a sulfonamide group; n1 is 0, 1, 2 or 3; n2 is 0, 1, 2 or 3; n3 is 0, 1, 2 or 3; n4 is 0, 1, 2 or 3; provided that at least one of n1, n2, n3 or n4 is greater than 0.