Patent ID: 6503966
Filing Date: 2003-01-07
Classification: C09D

Abstract:
A non-aqueous ball point pen ink comprising: a colorant; an organic solvent; a non-Newtonian viscosity imparting agent; and a thickening agent consisting of polyvinyl pyrrolidone with a weigh-average molecular weight of about 40,000 to 55,000, wherein a non-Newtonian viscosity index of the ink is not less than 0.1 and less than 0.4, a viscosity of the ink in a shearing speed of 500 secâˆ’1 is not less than 1,000 and less than 3,000 mPaâ€¢s at 20Â° C., and the viscosity of the ink in the shearing speed of 0.19 secâˆ’1 is not less than 40,000 mPaâ€¢s at 20Â° C. and not more than 70,000 mPaâ€¢s at 20Â° C.