| 摘要 |
<p>An encapsulated toner for heat-and-pressure fixing which is composed of a heat-fusible core containing at least a coloring material and a shell formed so as to cover the surface of the core, wherein the main component of the shell is a resin prepared by reacting an iso(thio)cyanate compound comprising (1) 0 to 30 mole % of monovalent isocyanate and/or isothiocyanate compounds and (2) 100 to 70 mole % of at least divalent isocyanate and/or isothiocyanate compounds with an active hydrogen compound comprising (3) 0 to 30 mole % of a compound having one active hydrogen atom reactive with isocyanate and/or isothiocyanate groups and (4) 100 to 70 mole % of a compound having at least two active hydrogen atoms reactive with isocyanate and/or isothiocyanate groups at a molar ratio of the components (1) and (2) to the components (3) and (4) of between 1 : 1 and 1 : 20, and wherein at least 30% of the whole linkages in which an isocyanate or isothiocyanate group participates are thermally dissociating linkages. This toner is excellent in blocking resistance and triboelectric properties and enables low-energy fixing. 1</p> |
