| 摘要 |
[Problem] To provide particles having a hardness which is intermediate between the low hardness of conventional thermoplastic resin particles comprising a styrene resin, an acrylic resin or the like and the high hardness of conventional thermosetting resin particles comprising a melamine resin or the like, namely, particles which combine sufficient hardness and softness. [Solution] Softened thermosetting resin particles obtained by a manufacturing process which includes: a step of reacting a monomer compound that contains at least one bifunctional monomer with an aldehyde compound under basic conditions in the presence of suspended colloidal silica having a mean particle diameter of 5 to 70nm to form an aqueous solution of a water-soluble melamine resin precondensate; and a step of adding an acid catalyst to the aqueous solution to deposit spherical softened thermosetting resin particles. |
