Patent ID: 7018454

Claim:
An ink jet ink comprising at least one dialkyl N-hydroxylamine salt of the formula (R 51 R 52 N—OH).(HY), or 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 comprises at least one dialkyl N-hydroxylamine salt of the formula (R 51 R 52 N—OH).(HY), where R 51 is alkyl of 1 to 36 carbon atoms, cycloalkyl of 5 to 12 carbon atoms or aralkyl of 7 to 9 carbon atoms; or R 51 is said alkyl, cycloalkyl or aralkyl substituted by one to six alkyl of 1 to 12 carbon atoms, halogen, cyano, E 41 O—, E 41 CO—, E 41 OCO—, E 41 COO—, E 41 S—, E 41 SO—, E 41 SO 2 —, NH 2 , NHE 41 , —NE 41 E 42 , —PO(OE 41 )(OE 42 ) or —OPO(OE 41 )(OE 42 ) groups; R 52 is hydrogen or independently has the same meaning as R 51 , where at least one of R 51 and R 52 contains a hydrogen alpha to the —NOH moiety; E 41 and E 42 independently are hydrogen, alkyl of 1 to 4 carbon atoms or alkyl of 1 to 4 carbon atoms substituted by one to three hydroxyl groups; or E 41 and E 42 independently are an oligomer of poly(ethylene glycol) or poly(propylene glycol) terminated by hydroxy, methoxy, acetate or propionate, where the oligomer has a molecular weight up to about 500; and HY is an inorganic or organic acid.