| 摘要 |
PROBLEM TO BE SOLVED: To provide amino resin crosslinked particles having high hardness, excellent in heat resistance and solvent resistance, and causing no discoloration, and to provide a method of producing the particles. SOLUTION: The producing process of amino resin crosslinked particles includes the step of curing an emulsion of an amino resin precursor and an emulsifier in the presence of a catalyst so as to prepare amino resin particles which amino resin precursor is a product of a reaction of an amino compound with formaldehyde, and then neutralizing the suspension of the amino resin particles after curing, and the step of heating the suspension in a temperature range of 130-190°C after the neutralizing step. The amino resin crosslinked particles thus prepared by the condensation of the amino compound and formaldehyde generate formaldehyde of≤1,000 ppm in a pyrolysis test and have a Hunter whiteness of≥85%. COPYRIGHT: (C)2007,JPO&INPIT
|
