| 摘要 |
<p>PURPOSE:To provide a recording liq. with high reliability by giving a recording head prolonged service life and reduced failure rate, by incorporating a particular dye. CONSTITUTION:As a recording agent forming a recorded image in an ink jet recording system, a recording liq. contg. a compd. of formula I (wherein R1 is OH, NH2; R2 is H, OH, NH2; R3 is H, NH2, SO3M; R4 is H, OH; R5, R6, R7 are H, SO3M, OH; M is Na, K, Li, ammoniums, amines) [e.g., a compd. (dye) of formula II, formula III] is yielded. On cleavage of the azo bond caused by heating said recording agent above 250 deg.C, the decomposition product has an enough solubility in the liq. medium, so that repeated formation and disappearance of foams over a long term does not cause the production or precipitation of insoluble matter on the surface of a hot head nor undischargeability from the recording head.</p> |
