Method for producing hollow resin particles
US12281184B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2020 |
| Grant date | Apr 22, 2025 |
| Priority date | — |
| Expiry date | Mar 16, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F222/102
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The method for producing hollow resin particles includes: carrying out a suspension treatment of a mixture liquid including a polymerizable monomer including a non-crosslinkable monomer and a crosslinkable monomer, a hydrocarbon solvent and an aqueous medium to prepare a suspension, carrying out a polymerization reaction of the suspension to form precursor particles having a hollow portion and including the hydrocarbon solvent in the hollow portion, and removing the hydrocarbon solvent included in the precursor particles to produce hollow resin particles. A content of the crosslinkable monomer is from 35 parts by mass to 95 parts by mass when the total mass of the polymerizable monomer is regarded as 100 parts by mass; a solubility parameter (SP value) of the polymerizable monomer is from 8.70 to 9.42; and a difference between the SP value of the polymerizable monomer and a SP value of the hydrocarbon solvent is 0.60 or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.