US 12,264,237 B2
Pressure-responsive particles, cartridge, apparatus for manufacturing printed matter, method for manufacturing printed matter, printed matter, sheet for manufacturing printed matter, and method for manufacturing sheet for manufacturing printed matter
Yoshifumi Iida, Kanagawa (JP); Takashi Hasegawa, Kanagawa (JP); Satomi Kashiwagi, Kanagawa (JP); Takako Kobayashi, Kanagawa (JP); and Satoshi Inoue, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on Jan. 25, 2021, as Appl. No. 17/157,959.
Claims priority of application No. 2020-147777 (JP), filed on Sep. 2, 2020.
Prior Publication US 2022/0064424 A1, Mar. 3, 2022
Int. Cl. C08L 25/14 (2006.01); B42D 15/02 (2006.01); C08F 220/18 (2006.01); C08K 3/22 (2006.01); C08K 3/36 (2006.01); C08L 33/10 (2006.01); C09J 125/14 (2006.01); C09J 133/10 (2006.01); G03G 9/08 (2006.01); G03G 9/087 (2006.01); G03G 9/093 (2006.01); G03G 9/097 (2006.01)
CPC C08L 25/14 (2013.01) [B42D 15/02 (2013.01); C08F 220/1804 (2020.02); C08F 220/1808 (2020.02); C08K 3/22 (2013.01); C08K 3/36 (2013.01); C08L 33/10 (2013.01); C09J 125/14 (2013.01); C09J 133/10 (2013.01); G03G 9/0825 (2013.01); G03G 9/08711 (2013.01); G03G 9/08728 (2013.01); G03G 9/09371 (2013.01); G03G 9/09725 (2013.01); C08K 2003/2213 (2013.01); C08K 2003/2237 (2013.01); C08K 2201/003 (2013.01); C08L 2207/53 (2013.01)] 20 Claims
 
1. Pressure-responsive particles comprising:
pressure-responsive base particles; and
first inorganic oxide 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 alkyl esters as polymerization components and in which a mass ratio of the (meth)acrylic acid alkyl esters to all polymerization components is 90% by mass or higher,
wherein among the at least two kinds of (meth)acrylic acid alkyl esters contained in the (meth)acrylic acid ester-based resin as polymerization components, a mass ratio between the two kinds of (meth)acrylic acid alkyl esters having the highest mass proportion is 80:20 to 20:80, and the pressure-responsive base particles have a core portion that contains the styrene-based resin and the (meth)acrylic acid ester-based resin and a shell layer that contains the styrene-based resin coats the core portion, wherein a mass ratio of styrene to all polymerization components of the styrene-based resin is 60% by mass or higher and 95% by mass or lower,
the other vinyl monomers that the styrene-based resin contains as the polymerization components include n-butyl acrylate,
the at least two kinds of (meth)acrylic acid alkyl esters contained in the (meth)acrylic acid ester-based resin as the polymerization component includes 2-ethylhexyl acrylate and n-butyl acrylate,
the first inorganic oxide particles include at least strontium titanate particles,
Db/Da which is a ratio of a number average particle diameter Db of the first inorganic oxide particles to a number average particle diameter Da of the pressure-responsive base particles is 0.05 or higher and 0.25 or lower,
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.