| 摘要 |
<p>PURPOSE:To obtain a black recording fluid which gives a high-quality printing and a high-density record image even when used for recording on a plain paper, is excellent in resistances to water and light, and has a good long-storage stability by compounding a specific black dye into the fluid. CONSTITUTION:A recording fluid contains an aq. medium and at least one member selected from dyes represented by formula I (wherein A is an optionally substd. phenyl or naphthyl group; B is an optionally substd. phenylene or naphthylene group; R is H or an optionally substd. alkyl group; M is an alkali metal, an ammonium group, or an org. amine group; and n is 0 or 1). The fluid may contain various additives; for instance, the addition of 0.1-10wt.% (based on the whole fluid) urea, thiourea, biuret, or semicarbazide or 0.001-5.0wt.% (based on the whole fluid) surfactant further improves the drying speed and printing quality.</p> |
