Title:
METHOD FOR PRODUCING HOLLOW PARTICLE
Document Type and Number:
WIPO Patent Application WO/2022/071276
Kind Code:
A1
Abstract:
Provided is a method for producing a hollow particle which has a high porosity and which is unlikely to collapse. The present invention is a method for producing a hollow particle which has a porosity of 50% or more and which comprises: a shell that contains a resin; and a hollow portion that is surrounded by the shell. This production method includes: a step for preparing a mixed liquid containing a first polymerizable monomer, a hydrocarbon-based solvent, a dispersion stabilizer and an aqueous medium; a step for suspending this mixed liquid so as to prepare a suspension in which droplets of a monomer composition containing the first polymerizable monomer and the hydrocarbon-based solvent are dispersed in the aqueous medium; and a step for subjecting the suspension to a polymerization reaction. The content of a crosslinkable monomer is 75-100 parts by mass relative to 100 parts by mass of the first polymerizable monomer. At a point where the polymerization conversion rate of the first polymerizable monomer reaches 93 mass% or more in the step for subjecting the suspension to a polymerization reaction, a second polymerizable monomer, which has a solubility in distilled water of 0.3 g/L or more at 20°C, is added and the suspension is subjected to a further polymerization reaction.
Inventors:
WATANABE MASASHI (JP)
Application Number:
PCT/JP2021/035538
Publication Date:
April 07, 2022
Filing Date:
September 28, 2021
Export Citation:
Assignee:
ZEON CORP (JP)
International Classes:
C08F2/20; B01J13/18; C08F20/18; C08F265/06
Domestic Patent References:
| WO2021112110A1 | 2021-06-10 | |||
| WO2020261926A1 | 2020-12-30 |
Foreign References:
| JP2020132820A | 2020-08-31 |
Attorney, Agent or Firm:
KISHIMOTO, Tatsuhito et al. (JP)
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