Production of monodisperse, polymeric microspheres
US4929400A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1986 |
| Grant date | May 29, 1990 |
| Priority date | — |
| Expiry date | Apr 28, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2446/60
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Very small, individual polymeric microspheres with very precise size and a wide variation in monomer type and properties are produced by deploying a precisely formed liquid monomer droplet, suitably an acrylic compound such as hydroxyethyl methacrylate into a containerless environment. The droplet which assumes a spheroid shape is subjected to polymerizing radiation such as ultraviolet or gamma radiation as it travels through the environment. Polymeric microspheres having precise diameters varying no more than plus or minus 5 percent from an average size are recovered. Many types of fillers including magnetic fillers may be dispersed in the liquid droplet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.