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Monodisperse submicron polymer particles

  • US 10,017,586 B2
  • Filed: 03/08/2017
  • Issued: 07/10/2018
  • Est. Priority Date: 04/29/2009
  • Status: Active Grant
First Claim
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1. A process for the preparation of monodisperse particles for use as Ugelstad seed particles, the process comprising an emulsion polymerization process comprising:

  • forming an aqueous dispersion comprising a vinylic monomer and a water soluble polymerization initiator; and

    agitating until the dispersion becomes visibly cloudy,wherein the aqueous dispersion comprises a surfactant and a chain transfer agent is added after the dispersion becomes visibly cloudy, such that the polymerization forms monodisperse seed particles having a z-average diameter of from 50 nm to 200 nm and, when measured by gel permeation chromatography, the polymer has a mean weight average molecular weight of more than 1,000 and less than 70,000.

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