Patent ID: 7538148

Claim:
A ball-point pen provided with a pen tip and an ink tube, wherein an aqueous ink composition is stored in the ink tube, the aqueous ink composition comprising: a three-dimensional film-forming component, film-forming assistant, the film-forming assistant being included in the aqueous ink composition in an amount of 0.01 to 3% by weight with respect to the total amount of the aqueous ink composition, and water, wherein the three-dimensional film-forming component is an adhesive synthetic resin emulsion, the adhesive synthetic resin emulsion (1) has a minimum film-forming temperature (MFT) that is not greater than 25° C., (2) is included in an amount of at least 30% by weight on the basis of the solid content with respect to the total amount of the aqueous ink composition, and (3) is at least one selected from the group consisting of acrylic synthetic resin emulsion and styrene acrylic synthetic resin emulsion, and the aqueous ink composition has an ink viscosity that is not less than 5 mPa·s to less than 100 mPa·s (ELD viscometer, 1° 34′ cone rotor, 10 rpm, 20° C.).