Polymer particles of controlled shape
US6380297B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1999 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Aug 12, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J3/14
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for the preparation of polymer particles comprising the steps of: a) forming an organic phase by dissolving a polymer material in a solvent; b) dispersing the organic phase in an aqueous phase comprising a particulate stabilizer and homogenizing the resultant dispersion, thereby forming spherical particles having a selected particle and uniform particle size distribution; c) following the homogenizing, adding a particle shape-modifying surface active material to the spherical particles; and d) removing the solvent, thereby producing irregularly shaped polymer particles having substantially the same selected particle size and particle size distribution as that of the spherical particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.