| 摘要 |
<p>PURPOSE:To provide a recording liquid which has prolonged continuous recordability and discharge stability after long-term recording suspension and is suitable for use in writing utensils and ink jet recording, containing a specified monoazo compd. CONSTITUTION:0.5-20wt% compd. (dye) of the formula [wherein R1, R2, R3, R4 are each H, halogen, OH, SO3M (wherein M is alkali metal, ammonium, amine), NO2, CH3, OCH3] is dissolved in a recording liquid. Since the compd. has an azo linkage on the molecule, it can be thought that even when the recording liquid is instantaneously exposed to high temperature above 250 deg.C in a thermal action part in a recording head and the compd. is decomposed, the molecular chain is mainly broken at the azo linkage part. Therefore, the decomposition products of the compd. are relatively stable per se and most of them contain highly hydrophilic groups such as SO3M or OH so that they are highly soluble in the recording liquid. Thus, stable recording becomes possible without forming precipitates.</p> |
