The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 08, 2022
Filed:
Oct. 16, 2018
Kabushiki Kaisha Pilot Corporation, Tokyo-to, JP;
The Pilot Ink Co., Ltd., Aichi-ken, JP;
Katsuyuki Fujita, Aichi-ken, JP;
Yasuaki Kambe, Aichi-ken, JP;
Masayuki Mita, Aichi-ken, JP;
Tomoyuki Yamamura, Aichi-ken, JP;
KABUSHIKI KAISHA PILOT CORPORATION, Tokyo-To, JP;
THE PILOT INK CO., LTD., Aichi-Ken, JP;
Abstract
To provide a reversibly thermochromic aqueous ink composition excellent in dispersion stability of a reversibly thermochromic microcapsule pigment and a writing instrument using the same. Disclosed is a reversibly thermochromic aqueous ink composition comprising a reversibly thermochromic microcapsule pigment encapsulating a reversibly thermochromic composition comprising (a) an electron-donating color-developing organic compound, (b) an electron-accepting compound, and (c) a reaction medium to determine an occurrence temperature of a coloring reaction of the component (a) and the component (b), and a vehicle comprising water and a specific gravity adjuster selected from the group consisting of an oxyacid belonging to Group 6 having an atomic weight of 90 to 185 or salt thereof.