Production of monodisperse, polymeric microspheres
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United States of America Patent
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May 29, 1990
Grant Date -
N/A
app pub date -
Apr 28, 1986
filing date -
Apr 28, 1986
priority date (Note) -
Expired
status (Latency Note)
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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.
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