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Polyacrolein microspheres

  • US 4,678,814 A
  • Filed: 07/01/1985
  • Issued: 07/07/1987
  • Est. Priority Date: 03/30/1981
  • Status: Expired due to Fees
First Claim
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1. A method of preparing small polymeric microspheres comprising the steps of:

  • forming a solution of less than 5% by weight of a monomer mixture containing at least 10% by weight of an unsaturated aldehyde selected from the group consisting of acrolein and C1 to C8 aryl, alkyl and cycloalkyl derivatives thereof and at least 20% by weight of at least one addition copolymerizable monomer having a hydrophilic substituent selected from hydroxyl amino or carboxyl and 0.1 to 20% of a polyunsaturated crosslinking agent;

    irradiating the solution with radiation capable of initiating polymerization; and

    recovering said microspheres.

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