Aqueous ink composition for writing instrument
AssigneeMitsubishi Pencil Company, Limited
InventorsKousuke Ogura, Akiko Hirayama, Kana Miyoshi
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Abstract
Provided is an aqueous ink composition for a writing instrument with excellent stability of ink flow and the like, in which aggregation of a microcapsule pigment and clogging due to such aggregation are suppressed. The aqueous ink composition for a writing instrument includes a microcapsule pigment which includes inside, at least, a pigment and a medium of a fatty acid polyol ester. A melting point of the fatty acid polyol ester is preferably 40° C. or higher, and is preferably 70° C. or lower.
Claims5
An aqueous ink composition for a ballpoint pen, including inside a microcapsule pigment including, at least, a pigment and a medium of a fatty acid polyol ester,
- wherein the fatty acid polyol ester is an ester constituted of a fatty acid and a polyol selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, glycerin, sorbitan, sorbitol, pentaerythritol, dipentaerythritol, and trimethylolpropane, and
- wherein a melting point of the fatty acid polyol ester is 40° C. or higher and 70° C. or lower.
Dependencies are inferred from the claim text.