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Processes for the preparation of toners

  • US 5,164,282 A
  • Filed: 04/17/1989
  • Issued: 11/17/1992
  • Est. Priority Date: 04/17/1989
  • Status: Expired due to Fees
First Claim
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1. A process for the preparation of toner particles with an average diameter from about 5 to about 25 microns, which comprises mixing from about 1 to about 10 monomers with a polymerization initiator, a crosslinking component and a chain transfer component;

  • effecting bulk polymerization until from about 10 to about 40 weight percent of the monomer has polymerized;

    mixing with the aforementioned partially polymerized product pigment or dye particles until an organic phase is formed;

    dispersing the organic phase in water containing a stabilizing component selected from the group consisting of nonionic and ionic water soluble polymeric stabilizers, polyvinyl alcohol, gelatins, starches, gums, alginates, zein, and casein, which dispersion is accomplished with a high shear homogenizer, whereby there is obtained a suspension of toner particles in water; and

    polymerizing the toner suspension, and wherein bulk and suspension polymerization are accomplished by heating to a temperature of from about 50°

    to 100°

    C.

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