| 摘要 |
An improved infrared absorptive jet printing ink is provided. The composition includes an aqueous solution of a mixture of infrared absorptive water soluble dyestuffs, an alkaline agent which completely solubilizes the dyestuffs in water and aids in their penetration of and fixation to paper, and a humectant to prevent the composition from drying out. Optional additives include a fiber fixing agent or a water repellent agent and a defoaming agent. The ink runs well in a multi-jet printer, is smudge resistant and waterproof when dry, has a high absorptivity at infrared wavelengths, and is optically black.
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