Color-forming inks for image-producing systems

Details Color-forming inks for image-producing systems Color-forming inks for image-producing systems

B - Operations, Transporting

32

B

42/11

B32B 9/06 (2006.01) B41M 5/136 (2006.01) C09B 29/06 (2006.01)

Patent

CA 1076800

Abstract of the Disclosure An image producing system is provided which comprises paper impregnated or coated with a dispersion of a colour former in a mixture of water and a water-miscible organic solvent for the colour former; and a carrier material impregnated with a solution of an organic acid in a weakly volatile high boiling solvent. The colour formers are azo compounds having the formula: Image (I) in which R1, R2 and R3 each represents a member selected from the group con- sisting of hydrogen, halogen, alkyl, alkoxy, aryloxy, alkoxycarbonyl, dialkylaminocarbonyl, acylamino, acyl(alkyl)amino, Image , in which Y1 and Y2 each represents alkyl or aryl, or in which Y1 and Y2 together represents a member selected from the group consisting of alkyl or aryl, or in which Y1 and Y2 together represent an alkylene group; X1 is hydrogen or an alkyl group, X2 is an alkyl, cyanoalkyl or arylmethylene group or X1 and X2 together represent an alkylene group, X3 is an alkyl or aryl group and n is 1 or 2, or the general formula II: (II) Image in which Z1, Z2 and Z3 each represents a member selected from the group consisting of hydrogen, alkyl, substituted alkyl, alkoxy, halogen, nitro, acylamino, aminoacyl or alkoxycarbonyl, A1 and A2 each represents alkyl or phenyl or A1 and A2 together with the nitrogen atom to which they are bound form a heterocyclic ring system and n is 1 or 2.

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