Patent ID: 7384464

Claim:
An ink-jet system comprising a recording material and at least one colored ink to be applied to the recording material by means of an ink-jet nozzle wherein the recording material or the at least one colored ink contains at least one water soluble hindered amine of the formula (I) wherein G 1 and G 2 are independently alkyl of 1 to 4 carbon atoms or are together pentamethylene; Z 1 and Z 2 are each methyl, or Z 1 and Z 2 together form an unsubstituted linking moiety or a linking moiety substituted by one or more groups selected from an ester, ether, hydroxy, oxo, cyanohydrin, amide, amino, carboxy or an urethane group; E is —O-T-(OH) b , T is a straight or branched chain alkylene of 1 to 18 carbon atoms, cycloalkylene of 5 to 18 carbon atoms, cycloalkenylene of 5 to 18 carbon atoms, a straight or branched chain alkylene of 1 to 4 carbon atoms substituted by phenyl or by phenyl substituted by one or two alkyl groups of 1 to 4 carbon atoms; b is 1, 2 or 3 with the proviso that b cannot exceed the number of carbon atoms in T, and when b is 2 or 3, each hydroxyl group is attached to a different carbon atoms of T; HY is an inorganic or organic acid; and, wherein the total charge of cations is equal to the total charge of anions.