Patent ID: 11965044
Assignee: FUJIFILM BUSINESS INNOVATION CORP.
Field: nan (nan)
Classification: CPC nan | IPC B  C

Claim 0:
1. Pressure-responsive particles comprising:
pressure-responsive base particles; and
fatty acid metal salt particles,
wherein the pressure-responsive base particles contain a styrene-based resin which contains styrene and other vinyl monomers as polymerization components and a (meth)acrylic acid ester-based resin which contains at least two kinds of (meth)acrylic acid esters as polymerization components and in which a mass ratio of the (meth)acrylic acid esters to all polymerization components is 90% by mass or higher,
the pressure-responsive particles have at least two glass transition temperatures, and
a difference between a lowest glass transition temperature and a highest glass transition temperature is 30° C. or higher of the pressure-responsive particles,
the pressure-responsive particles has a core portion in which island phases are present and a shell layer in which no island phase is present, and the sea phase contains the styrene-based resin, and the island phases contain the (meth)acrylic acid ester-based resin.