| 摘要 |
An ink for ink jet printers which comprises an aqueous carrier medium, pigment dispersion or dye and a polyol/alkylene oxide condensate cosolvent which eliminates film formation on thermal ink jet resistor surfaces thereby eliminating non-uniformity in optical density. The cosolvent present at least 5% has a solubility in water of at least 4.5 parts in 100 parts of water at 25 DEG C. and a general formula: <IMAGE> wherein X=-H or -CH3; R=-H, -CH3, -C2H5, -C3H7, -C4H9, or -CH2O(CH2CH2O)eH; b=0 or 1, a+d+f(c+e)=2-100; and f=1-6, the cosolvent being present in the amount of at least 4.5% based on the total weight of the ink jet ink composition. These inks exhibit freedom from thermal resistor film formation, have excellent decap performance, are storage stable and give images having excellent print quality.
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