Patent ID: 6790590
Filing Date: 2004-09-14
Classification: B41C,B41M,C09B,Y10S

Abstract:
An infrared absorbing compound of the structure: in which:Y1 and Y2 are each independently hydrogen, halo, alkyl, diphenylamino, or phenylthio; R1, R2, R3, and R4 are each independently hydrogen, methyl, or SO3âˆ’, with the proviso that two of R1, R2, R3, and R4 are SO3âˆ’; R5 and R6 are each independently an alkyl group; Z1, Z2, Z4, and Z5 are each independently a benzo group or a naphtho group; Z3 and Z6 are each independently two hydrogen atoms, a cyclohexene residue, or a cyclopentene residue; X1, X2, X3, and X4 are each independently S, O, NH, CH2, or C(CH3)2; and n1 and n2 are each independently 0 to 4.