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US 4,500,658 AGranted
Radiopaque acrylic resin
AssigneeAustenal International, Inc.
InventorAdrian S. Fox
Life of this patent
Estimating the term…
Abstract
Biomedical radiopaque acrylic resin, in bead form, with an average diameter of from about 10 to 100 microns and having substantially uniformly dispersed throughout the bead about 5 to 50 wt. % of radiopaque inorganic pigment with an average particle size of about 0.1 to 20 microns.
Claims9
A process for preparing a radiopaque acrylic particle in bead form comprising:
- (a) substantially uniformly dispersing in an acrylic monomer from about 5 to 50 wt.% of a radiopaque inorganic pigment having an average particle size of from about 0.1 to 20 microns, an effective amount of a surfactant and an effective amount of a free radical-forming polymerization initiator;
- and
- (b) contacting drops of the resulting monomer-pigment dispersion with an aqueous solution containing an effective amount of a dispersant at a temperature of from about 50.degree. to 125.degree. C. to polymerize said monomer.
Dependencies are inferred from the claim text.