Title:
PRODUCTION OF FINE AMINO RESIN PARTICLE HAVING NARROW PARTICLE DIAMETER DISTRIBUTION
Document Type and Number:
Japanese Patent JPH0320317
Kind Code:
A
Abstract:
PURPOSE:To obtain particles of an amino resin of a narrow particle diameter distribution without being overground by reacting an amino compound with an aldehyde in the presence of an acid catalyst in an aqueous medium and treating the slurry of the formed solid product by a combination of a plurality of grinding steps and classification steps. CONSTITUTION:A slurried solid polymer obtained by reacting an amino compound such as urea with an aldehyde in the presence of an acid catalyst in an aqueous solution is ground by a combination of a plurality of grinders and classifiers to obtain continuously amino resin particles (of a maximum particle diameter <=40mum and a mean particle diameter of 5-15mum). A ball mill or an impact mill is used as the primary grinder, a vibrating screen or a hydrocyclone is used as the primary classifier, a pin mill is used as the secondary grinder, and a three-liquid classification cyclone is used as the secondary classifier.
Inventors:
NAGAOKA MUNEO
HAYANO SABURO
HAYANO SABURO
Application Number:
JP5968589A
Publication Date:
January 29, 1991
Filing Date:
March 14, 1989
Export Citation:
Assignee:
MITSUI TOATSU CHEMICALS
International Classes:
C08G12/00; C08G12/02; C08G12/12; C08G12/38; (IPC1-7): C08G12/02
Next Patent: JPH0320318