Patent ID: 8080098
Filing Date: 2011-12-20
Classification: C09D

Abstract:
1. An ink-free type writing instrument, comprising: a pen tip; and an ink tube, wherein a water-based ink composition is contained inside the ink tube, the water-based ink composition comprises 2.5 to 50 wt % of white-colored resin particles, and 2.5 to 50 wt % of film-forming resin emulsions in a solid content with respect to the total amount of the ink, the film-forming resin emulsions have a glass transition temperature of not greater than 0° C., the ratio of said white-colored resin particles to said film-forming resin emulsions is 1:0.2 to 1:3 in a solid content, said white-colored resin particles and said film-forming resin emulsions in a solid content are contained in not less than 20 wt % in total, and a flowage amount of said ink out of the pen tip is at least 50 mg/10 m such that a three-dimensional handwriting having a thickness of 20 to 50 μm can be obtained.