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Crosslinked methacrylic anhydride copolymers

  • US 5,539,071 A
  • Filed: 06/06/1995
  • Issued: 07/23/1996
  • Est. Priority Date: 05/29/1992
  • Status: Expired due to Term
First Claim
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1. A process for making crosslinked, spherical copolymer beads having a particle size between about 10 μ

  • m and about 2 mm which comprisesa. suspending droplets of a monomer mixture comprising methacrylic anhydride in an amount that is at least 50% by weight of the monomer, a crosslinking monomer and a monomer-soluble, free-radical polymerization initiator in an aqueous suspending medium,b. heating the droplets above the decomposition temperature of the polymerization initiator until the monomer mixture has polymerized to form copolymer beads, andc. separating the copolymer beads from the suspending medium.

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