| 摘要 |
The encapsulated toner for heat-and-pressure fixing of the present invention has a heat-fusible core material containing at least a thermoplastic resin and a coloring agent and a shell formed thereon so as to cover the surface of the core material. Moreover, the encapsulated toner has the following properties: 1) The glass transition temperature ascribed to the thermoplastic resin used as a main component of the heat-fusible core material is 10 DEG C. to 50 DEG C.; 2) A minimum load required for 58 compression of a particle size of the encapsulated toner is from 5 to 50 mgf, and a minimum load required for 10% compression of a particle size of the encapsulated toner is from 10 to 100 mgf, when a compressive variation of one toner particle is measured by a micro compression testing machine under the given conditions; and 3) The difference in cohesiveness before and after keeping the toner standing at 50 DEG C. for 24 hours, is not more than 10, wherein the cohesiveness is defined as the sum of values (a), (b), and (c) obtained by the following equations: (a)=(weight % of the toner remainingx1, on a 250 mu m mesh-sieve) (b)=(weight % of the toner remainingx0.6, and on a 149 mu m mesh-sieve) (c)=(weight % of the toner remainingx0.2, on a 74 mu m mesh-sieve) each of the weight % in the equations being measured by a powder property analyzer.
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