| 摘要 |
<p>PURPOSE:To obtain the subject ink containing water, coloring agent, water soluble organic solvent, lubricant and pseudoplasticity providing agent, having a specific fluid physical property and adequate to an aqueous ink for ball pint pen, sign pen, etc. CONSTITUTION:The objective ink containing (A) water, (B) coloring agent, (C) water soluble organic solvent of 5 to 50% based on total ink composition, (D) lubricant of 0.1 to 3% based on total ink composition and (E) pseudoplasticity providing agent. The objective ink has an extremely high mutual relation under 1-1000/S shear rate to the fluid equations eta-MD<n-1> and S=muD<n> [etais viscosity (Pa.S); mu is non-Newtonian flow coefficient; D is shear stress (Pa)] and simultaneously being 0.6<n<0.9 in non-Newtonian viscosity index, exhibiting pseudoplasticity in rheological characteristics and being 3-20m.Pa.S in viscosity when shear rate at 25 deg.C is 200/S.</p> |
