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Toner for developing electrostatic image containing higher and lower molecular weight polymer components

  • US 5,744,276 A
  • Filed: 03/30/1994
  • Issued: 04/28/1998
  • Est. Priority Date: 03/31/1993
  • Status: Expired due to Term
First Claim
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1. A toner composition for developing an electrostatic image, comprising:

  • polymer components, a colorant and a metal-containing organic compound, whereinthe composition shows a melt index (at 125°

    C., 10 kg-load) of 5-25 g/10 min., andthe polymer components are characterized by(a) having a THF (tetrahydrofuran)-insoluble content from 0 to 5 wt. %,(b) including a THF-soluble content thereof providing a GPC (gel permeation chromatography) chromatogram showingi) a main peak in a molecular weight region of 2×

    103 -3×

    104, and a sub-peak or shoulder in a molecular weight region of at least 105, andii) an areal percentage of 3-10% in a molecular weight region of at least 106, and(c) including a polymer component (H) providing the sub-peak or shoulder in the molecular weight region of at least 105 obtained by polymerization using a polyfunctional polymerization initiator and a mono-functional polymerization initiator, said polymer component (H) comprising a monomer unit (A) having at least one species of carboxyl group, carboxylic acid salt group or carboxylic anhydride group.

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