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Toner and two-component developer

  • US 9,417,540 B2
  • Filed: 12/12/2014
  • Issued: 08/16/2016
  • Est. Priority Date: 12/26/2013
  • Status: Active Grant
First Claim
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1. A toner comprising:

  • a binder resin;

    a colorant; and

    a wax,the toner being obtained through a step of melting and kneading the binder resin, the colorant, and the wax,wherein;

    the binder resin comprises;

    a polyester resin A having a polyhydric alcohol unit and a polyvalent carboxylic acid unit, anda polyester resin B having a polyhydric alcohol unit and a polyvalent carboxylic acid unit;

    a mass ratio (polyester resin A/polyester resin B) of the polyester resin A to the polyester resin B is from 10/90 or more to 60/40 or less;

    the polyester resin A has a softening point of from 120°

    C. or more to 180°

    C. or less;

    the polyester resin A contains 90 mol % or more of a polyhydric alcohol unit derived from an aromatic diol with respect to a total number of moles of the polyhydric alcohol unit, and contains 0.1 mol % or more to 10.0 mol % or less of a polyhydric alcohol unit derived from an oxyalkylene ether of a novolac type phenol resin with respect thereto;

    the polyester resin A contains 15 mol % or more to 50 mol % or less of a polyvalent carboxylic acid unit derived from an aliphatic dicarboxylic acid, which contains a straight-chain hydrocarbon having 4 or more to 16 or less carbon atoms as a main chain and has carboxyl groups at both terminals of the main chain, with respect to a total number of moles of the polyvalent carboxylic acid unit;

    the polyester resin B has a softening point of from 80°

    C. or more to 100°

    C. or less;

    the polyester resin B contains 90 mol % or more of a polyhydric alcohol unit derived from an aromatic diol with respect to a total number of moles of the polyhydric alcohol unit;

    the polyester resin B contains 90 mol % or more of a polyvalent carboxylic acid unit derived from one of an aromatic dicarboxylic acid and a derivative thereof with respect to a total number of moles of the polyvalent carboxylic acid unit; and

    the polyester resin B contains 0.1 mol % or more to 10.0 mol % or less of a polyvalent carboxylic acid unit derived from one of an aliphatic dicarboxylic acid and a derivative thereof with respect to the total number of moles of the polyvalent carboxylic acid unit.

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