Crosslinked polymer particle and its production process and use
US6410616B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1999 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Apr 7, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J3/26
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides a process in which no surfactant is used, or even if the surfactant is used the amount thereof is as small as possible, thus stably obtaining a suspension to carry out a crosslinking reaction. A production process for a crosslinked polymer particle, comprising the steps of: forming a suspension in which liquid drops of a first phase are dispersed in a second phase by stirring both phases in the presence of an inorganic particle, wherein the first phase includes a high-molecular compound and a crosslinking agent, and wherein the first phase and the second phase are insoluble in each other, and wherein the affinity of the inorganic particle for water is different from that of the high-molecular compound; and carrying out a crosslinking reaction. Furthermore, an approximately spherical crosslinked polymer particle, which is free from a surfactant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.