Porous particle made of organic polymer, method for producing porous particle made of organic polymer, and block copolymer

Patent metadata

Field	Value
Publication number	US-10858491-B2
Application number	US-201615751743-A
Country	US
Kind code	B2
Filing date	Aug 5, 2016
Priority date	Aug 10, 2015
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

The present invention provides porous particles made of an organic polymer, uniform in shape, and having through holes that are not closed. The porous particles according to the present invention are porous particles having a substantially spherical shape. The porous particles are made of an organic polymer. Each of the porous particles has an interconnected pore structure in which through holes provided inside the porous particle communicate with each other, and ends of the through holes are open toward an outside of the porous particle.

First claim

The invention claimed is:

1. Porous particles having a substantially spherical shape, wherein
the porous particles are made of an organic polymer,
each of the porous particles has an interconnected pore structure in which through holes provided inside the porous particle communicate with each other,
the through holes have a co-continuous structure,
the through holes are formed by spinodal decomposition, and
ends of the through holes are open toward an outside of the porous particle.

2. The porous particles according to claim 1 , wherein
each of the porous particle is shaped so that the longest diameter is not more than 1.6 times the shortest diameter.

3. The porous particles according to claim 1 , having a mean particle size in a range from 0.5 to 30,000 μm.

4. A method for producing the porous particles according to claim 1 , the method comprising:
a dispersion preparation step of preparing a dispersion by dispersing a porous particle raw material comprising an organic monomer and/or an organic prepolymer in a dispersion medium; and
a polymerization step of polymerizing the porous particle raw material in the dispersion,
wherein, in the polymerization step, the through holes are formed by spinodal decomposition.

5. The method according to claim 4 , wherein
in the dispersion preparation step, the porous particle raw material is dispersed in the dispersion medium together with a dispersant.

6. The method according to claim 5 , wherein
the dispersant is a block copolymer comprising a hydrophobic polymer block and a hydrophilic polymer block.

7. The method according to claim 6 , further comprising a dispersant production step of producing the dispersant,
the dispersant production step comprising:
a first living radical polymerization step of forming one of the hydrophobic polymer block and the hydrophilic polymer block by living radical polymerization; and
a second living radical polymerization step of forming the other one of the hydrophobic polymer block and the hydrophilic polymer block by living radical polymerization after the first living radical polymerization step.

8. The method according to claim 5 , wherein
the dispersant is a surfactant.

9. A block copolymer comprising:
a hydrophobic polymer block; and
a hydrophilic polymer block,

wherein the block copolymer is used as the dispersant in the method according to claim 6 .

Assignees

• Univ Kyoto
• Emaus Kyoto Inc
• Kosen National Institute Of Tech

Inventors

• Ishizuka Norio
• Konishi Kyoko
• Oda Toshikazu
• Tsujii Yoshinobu
• Sakakibara Keita
• Sato Takaya

Classifications

• B01J20/28016

  Particle form · CPC title

• B01J20/264

  derived from different types of monomers, e.g. linear or branched copolymers, block copolymers, graft copolymers · CPC title

• A61K8/81

  obtained by reactions involving only carbon-to-carbon unsaturated bonds · CPC title

• C08J2363/00

  Characterised by the use of epoxy resins; Derivatives of epoxy resins · CPC title

• C08J9/0061

  characterized by the use of several polymeric components · CPC title