| 摘要 |
<p>A recording liquid comprising a coloring agent and water, wherein the recording liquid contains a polyol (A) having a solubility in water at 20 DEG C of 0.2 wt.% or more and not more than 4.5 wt.%, and at least one compound (B) selected from a group consisting of compound represented by formula (1) R1,R2,R3 . N->O (where R1 and R2 are an alkyl group or a hydroxyalkyl group having 1 to 3 carbon atoms, and R3 is an alkyl group or an alkenyl group having 10 to 20 carbon atoms ), and of compound represented by formula (2) represented by R4,R5,R6 . N-CH2-CO-O<-)<where R4 and R5 are an alkyl group or hydroxyalkyl group having 1 to 3 carbon atoms, and R6 is an alkyl group or alkyl group derived from cocoanut oil having 10 to 16 carbon atoms that may contain an amide group). The recording liquid shows synergistic effect including a high permeability with modified penetrating property capable of eliminating an increase in optical density at the backside-surface of the printing medium, anti-color bleeding property, and an effect on reduction of blurring of colors, by the combined use of the polyol (A) and compound (B). The polyol (A) has a small molecular weight so that the adsorbing speed onto the surface to be printed is very high, and has a property to render the nitrogen moiety of the compound (B) into positive charge. The compound (B) acts on compound (A) to make it insoluble.</p> |
