REVERSIBLY THERMOCHROMIC AQUEOUS INK COMPOSITION FOR WRITING UTENSILS, AND REFILL AND WATER-BASED BALLPOINT PEN EACH INTERNALLY CONTAINING SAME

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 thermochro...

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Bibliographische Detailangaben
Hauptverfasser:	OGURA, Mamiko, OHNO, Itsuka, MASUSHIGE, Naoto
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADHESIVES BUREAU ACCESSORIES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS CORRECTING FLUIDS DYES FILLING PASTES IMPLEMENTS FOR WRITING OR DRAWING INKS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS POLISHES TRANSPORTING USE OF MATERIALS THEREFOR WOODSTAINS WRITING OR DRAWING IMPLEMENTS
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Beschreibung
Zusammenfassung:	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.