To provide a reversible thermal discoloration aqueous ink composition which is capable of suppressing the lightening and deepening of handwriting at the time when a writing implement containing the reversible thermal discoloration aqueous ink composition in the barrel, and particularly, which does not lighten the color of handwriting with time in an erecting state or does not lighten the color of handwriting by the application of vibration at transportation or at the time when it is carried on in an erecting state, as well as a writing implement using the same and a writing implement set. A reversible thermal discoloration aqueous ink composition comprising water, a reversible thermal discoloration microcapsule pigment including a reversible thermal discoloration composition composed of (A) an electron donative coloring organic compound, (B) an electron accepting compound and (C) a reaction medium which determines a temperature at which color reactions of the both compounds occur, a polymer flocculant, a comb-type polymer dispersant having a carboxyl group at the side chain, an organic nitrogen sulfur compound, and a water-soluble resin; a writing implement 1 using the ink composition; and a writing implement set comprising the writing implement and a frictional body.
一种可逆热变色
水性墨
水组合物,其在书写工具的笔杆中包含可逆热变色
水性墨
水组合物时,能够抑制书写颜色的变浅和加深,特别地,在竖直状态下的书写颜色不随着时间变浅,或在运输过程中或在竖直状态下书写颜色不因振动而变浅;以及使用该墨
水组合物的书写工具和书写工具组。所述可逆热变色
水性墨
水组合物包括
水、可逆热变色微胶囊
颜料(包括由(A)供电子着色有机化合物、(B)受电子化合物和(C)确定两种化合物发生颜色反应的温度的反应介质组成的可逆热变色组合物)、聚合物絮凝剂、侧链带有羧基的梳型聚合物分散剂、有机氮
硫化合物和
水溶性
树脂。使用所述墨
水组合物的书写工具1;以及包括所述书写工具和摩擦体的书写工具组。