US 12,434,215 B2
Microcapsule production method
Takehiro Nishikawa, Hirakata (JP); Taku Hashimoto, Hirakata (JP); Hideo Sugimoto, Hirakata (JP); and Ai Nishibayashi, Hirakata (JP)
Assigned to MORISHITA JINTAN CO., LTD., Osaka (JP)
Appl. No. 18/006,650
Filed by MORISHITA JINTAN CO., LTD., Osaka (JP)
PCT Filed Jul. 28, 2021, PCT No. PCT/JP2021/027949
§ 371(c)(1), (2) Date Jan. 24, 2023,
PCT Pub. No. WO2022/025133, PCT Pub. Date Feb. 3, 2022.
Claims priority of application No. 2020-130794 (JP), filed on Jul. 31, 2020.
Prior Publication US 2023/0285923 A1, Sep. 14, 2023
Int. Cl. B01J 13/16 (2006.01)
CPC B01J 13/16 (2013.01) 9 Claims
 
1. A method for producing microcapsules using two types of emulsion particles differing in size, the method comprising:
an emulsion-forming step of separately forming two types of emulsions (1) and (2) whose continuous phases are common, wherein emulsion particles (1) of the emulsion (1) comprises one of two types of monomers which react with each other to form a film and emulsion particles (2) of the emulsion (2) comprises the other monomer; and
a microcapsule-forming step of mixing and interfacial-polymerizing the emulsion (1) and the emulsion (2),
wherein
the emulsion particles (1) of the emulsion (1) have an average particle size (R) of 0.1 to 300 μm,
the emulsion particles (2) of the emulsion (2) have an average particle size (r) of 0.01 to 30 μm, and
r/R≤0.1 is satisfied, and
the microcapsule-forming step has a reaction time of 6 hours or less.