Invention Application
- Patent Title: METHOD FOR PRODUCING HOLLOW PARTICLES
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Application No.: US17778080Application Date: 2020-12-02
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Publication No.: US20220355264A1Publication Date: 2022-11-10
- Inventor: Masashi Watanabe
- Applicant: ZEON CORPORATION
- Applicant Address: JP Tokyo
- Assignee: ZEON CORPORATION
- Current Assignee: ZEON CORPORATION
- Current Assignee Address: JP Tokyo
- Priority: JP2019-221626 20191206,JP2020-097938 20200604
- International Application: PCT/JP2020/044825 WO 20201202
- Main IPC: B01J13/18
- IPC: B01J13/18 ; C08F265/06 ; C08F2/44 ; C08F2/18

Abstract:
The method produces hollow particles which have a high void ratio, which can reduce the residual amount of a sparingly water-soluble solvent used in the production process, and which are less likely to collapse. The method for producing hollow particles which comprise a shell and a hollow portion and which have a void ratio of 50% or more and 90% or less, wherein a suspension treatment of a mixture liquid containing a polymerizable monomer for shell, a polar resin, a hydrocarbon solvent, a sparingly water-soluble inorganic metal salt as a dispersant, and an aqueous medium is carried out to prepare a suspension in which droplets of a monomer composition containing the polymerizable monomer for shell, the polar resin and the hydrocarbon solvent are dispersed in the aqueous medium; a polymerization reaction of the suspension is carried out; and the hydrocarbon solvent is removed from the obtained hollow particles.
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