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
Pressure-responsive particles include pressure-responsive base particles and first inorganic oxide particles, in which 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, 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.
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.
2. The pressure-responsive particles according to claim 1 ,
wherein the first inorganic oxide particles satisfy the ratio Db/Da of 0.08 or higher and 0.20 or lower.
3. The pressure-responsive particles according to claim 1 , further comprising:
second inorganic oxide particles having a number average particle diameter of 200 nm or less.
4. The pressure-responsive particles according to claim 3 ,
wherein the second inorganic oxide particles include silica particles.
5. The pressure-responsive particles according to claim 1 ,
wherein an amount of the first inorganic oxide particles added to the exterior of the pressure-responsive base particles is 0.05 parts by mass or more and 3 parts by mass or less with respect to 100 parts by mass of the pressure-responsive base particles.
6. The pressure-responsive particles according to claim 5 ,
wherein the amount of the first inorganic oxide particles added to the exterior of the pressure-responsive base particles is 0.08 parts by mass or more and 1.5 parts by mass or less with respect to 100 parts by mass of the pressure-responsive base particles.
7. The pressure-responsive particles according to claim 1 ,
wherein the other vinyl monomers that the styrene-based resin contains as polymerization components further include 2-ethylhexyl acrylate.
8. The pressure-responsive particles according to claim 1 ,
wherein in the pressure-responsive base particles, a content of the styrene-based resin is higher than a content of the (meth)acrylic acid ester-based resin.
9. The pressure-responsive particles according to claim 1 ,
wherein the pressure-responsive base particles have a sea phase containing the styrene-based resin and island phases which are dispersed in the sea phase and contain the (meth)acrylic acid ester-based resin.
10. The pressure-responsive particles according to claim 9 ,
wherein an average diameter of the island phases is 200 nm or greater and 500 nm or less.
11. The pressure-responsive particles according to claim 1 , which have a viscosity of 10,000 Pas under a pressure of 4 MPa at a temperature of 90° C. or lower.
12. A cartridge that accommodates the pressure-responsive particles according to claim 1 and is attached to and detached from an apparatus for manufacturing a printed matter.
13. An apparatus for manufacturing a printed matter, comprising:
an arrangement unit that accommodates the pressure-responsive particles according to claim 1 and arranges the pressure-responsive particles on a recording medium; and
a crimping unit that folds and crimps the recording medium or stacks and crimps the recording medium and another recording medium together.
14. The apparatus for manufacturing a printed matter according to claim 13 , further comprising:
a color image forming unit that forms a color image on the recording medium by using a coloring material.
15. A method for manufacturing a printed matter, comprising:
arranging the pressure-responsive particles according to claim 1 on a recording medium; and
folding and crimping the recording medium or stacking and crimping the recording medium and another recording medium together.
16. The method for manufacturing a printed matter according to claim 15 , further comprising:
forming a color image on the recording medium by using a coloring material.
17. A printed matter wherein facing surfaces of a folded recording medium adhere to each other by the pressure-responsive particles according to claim 1 .
18. A printed matter wherein facing surfaces of a plurality of stacked recording media adhere to each other by the pressure-responsive particles according to claim 1 .
19. A sheet for manufacturing a printed matter, comprising:
a substrate; and
pressure-responsive particles arranged on the substrate,
wherein the pressure-responsive particles according to claim 1 are used as the pressure-responsive particles.
20. A method for manufacturing a sheet for manufacturing a printed matter, comprising:
arranging the pressure-responsive particles according to claim 1 on a substrate.