REVERSIBLY THERMOCHROMIC AQUEOUS INK COMPOSITION FOR WRITING UTENSILS, AND REFILL AND WATER-BASED BALLPOINT PEN EACH INTERNALLY CONTAINING SAME
申请人:Kabushiki Kaisha Pilot Corporation (also trading
as Pilot Corporation)
公开号:EP3954745A1
公开(公告)日:2022-02-16
Provided are a reversibly thermochromic aqueous ink composition having excellent writability and few problems such as aggregation of a colorant, an increase in viscosity of the composition, or a decrease in handwriting density, and a refill or an aqueous ballpoint pen using the reversibly thermochromic aqueous ink composition.
A reversibly thermochromic composition is a reversibly thermochromic aqueous ink composition containing a reversibly thermochromic microcapsule pigment encapsulated in a microcapsule formed from an organic resin, an N-vinyl-2-pyrrolidone polymer, glycerin, and water, in which when contents (% by mass) of the reversibly thermochromic microcapsule pigment, the N-vinyl-2-pyrrolidone polymer, and the glycerin with respect to a total mass of the ink composition are PMC, PPVP, and PG, respectively, 0.3 ≤ PMC/(PPVP + PG) ≤ 4, and 0.2 ≤ PPVP/PG ^ 5, and a refill or an aqueous ballpoint pen incorporating the reversibly thermochromic aqueous ink composition.
本发明提供了一种可逆热致变色水性墨水组合物,该组合物具有极佳的书写性,且很少出现着色剂聚集、组合物粘度增加或书写密度降低等问题,还提供了使用该可逆热致变色水性墨水组合物的笔芯或水性圆珠笔。
可逆热致变色组合物是一种可逆热致变色水性墨水组合物,它包含封装在由有机树脂、N-乙烯基-2-吡咯烷酮聚合物形成的微胶囊中的可逆热致变色微胶囊颜料、甘油和水,其中当可逆热致变色微胶囊颜料、N-乙烯基-2-吡咯烷酮聚合物和甘油相对于油墨组合物总质量的含量(质量百分比)分别为 PMC、PPVP 和 PG 时,0.3 ≤ PMC/(PPVP + PG) ≤ 4,和 0.2 ≤ PPVP/PG ^ 5,以及包含可逆热致变色水性墨水组合物的笔芯或水性圆珠笔。