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:
Oct. 01, 2024
Filed:
Dec. 09, 2021
Fujifilm Business Innovation Corp., Tokyo, JP;
Yoshifumi Iida, Kanagawa, JP;
Takako Kobayashi, Kanagawa, JP;
Takashi Hasegawa, Kanagawa, JP;
Kiyohiro Yamanaka, Kanagawa, JP;
Takeshi Iwanaga, Kanagawa, JP;
Satoshi Kamiwaki, Kanagawa, JP;
Mieko Seki, Kanagawa, JP;
Sumiaki Yamasaki, Kanagawa, JP;
FUJIFILM Business Innovation Corp., Tokyo, JP;
Abstract
Pressure-responsive particles include pressure-responsive base particles and silica particles, in which the pressure-responsive base particles contain a styrene-based resin that contains styrene and other vinyl monomers as polymerization components and a (meth)acrylic acid ester-based resin that contains at least two kinds of (meth)acrylic acid esters as polymerization components and in which a ratio of a mass of the (meth)acrylic acid esters to a total mass of polymerization components is 90% by mass or more, the pressure-responsive particles have at least two glass transition temperatures, a difference between a lowest glass transition temperature and a highest glass transition temperature is 30° C. or higher, and a ratio of a surface coating rate Cs2 by the silica particles after application of the following first stress to a surface coating rate Cs1 by the silica particles before application of stress satisfies a relationship of 0.4≤Cs2/Cs1≤0.8.