Patent ID: 7563845

Claim:
A producing process of amino resin crosslinked particles, comprising the steps of: (1) adding a catalyst to an emulsion of an amino resin precursor that is obtained as an initial condensate by a reaction of an amino compound with formaldehyde, the emulsion being a mixture of a reaction solution containing the amino resin precursor with an aqueous solution of an emulsifier and/or a surfactant the reaction solution containing the amino resin precursor having a viscosity of 2×10 −2 Pa·s to 5.5×10 −2 Pa·s (20 cP to 55 cP) in a temperature range of 95° C. to 98° C., so as to cure the amino resin precursor in an emulsion state to prepare a suspension that contains amino resin particles; (2) neutralizing the suspension that contains the amino resin particles obtained in said step (1); and (3) separating the amino resin particles from the suspension after said step (2) and then heating the amino resin particles in a temperature range of 130° C. to 230° C., the suspension containing the amino resin particles being adjusted in said step (2) from a pH of 1.5 to 3 to a pH of not less than 5.