| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a core type polychromatic marking pen and ink for the same, in more detail, a core type polychromatic marking pen giving handwriting having a so-called gradation effect showing stability with time and aqueous pigment ink for it. <P>SOLUTION: The aqueous pigment ink for the core type polychromatic marking pen is characterized in that viscosity measured at 20°C by means of an E-type rotational viscometer is 3 to 12 mPas at a shear rate of 200s<SP>-1</SP>and a TI value defined by viscosity at a shear rate of 10 s<SP>-1</SP>/viscosity at a shear rate of 200s<SP>-1</SP>is in a range of 1.2 to 4 and viscosity measured at 20°C under stress is not less than 45 mPas under the stress of 0.01 Pa and is not more than 12 mPas under the stress of 10 Pa. <P>COPYRIGHT: (C)2004,JPO |
