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Title:
PROCESS FOR PRODUCING SPHERICAL COMPOUND HARDENED MELAMINE RESIN PARTICLES
Document Type and Number:
WIPO Patent Application WO/2002/070576
Kind Code:
A1
Abstract:
A process for producing spherical compound hardened melamine resin particles with excellent water resistance having colloidal silica localized around the surface, whereby the particle diameter can be controlled over a broad range of from the order of submicron to the order of micron. More specifically, the process comprises: the step (a) wherein, in a suspension of colloidal silica having an average particle diameter of 5 to 70 nm in an aqueous medium, a melamine compound is reacted with an aldehyde under basic conditions to thereby form an aqueous solution of primary condensation product of a water-soluble melamine resin; and the step (b) wherein an acid catalyst is added to the aqueous solution obtained in (a) and thus spherical compound hardened melamine resin particles are precipitated; optionally followed by the step (c) wherein the surface of the spherical compound hardened melamine resin particles is coated with inorganic compound particles.

Inventors:
OZAWA MASAAKI (JP)
YOSHIDA AKIRA (JP)
Application Number:
PCT/JP2002/001633
Publication Date:
September 12, 2002
Filing Date:
February 22, 2002
Export Citation:
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Assignee:
NISSAN CHEMICAL IND LTD (JP)
OZAWA MASAAKI (JP)
YOSHIDA AKIRA (JP)
International Classes:
C08K3/36; C08G12/32; C08J3/12; C08J3/26; C08J9/00; C08L61/28; (IPC1-7): C08G12/32; C08J3/12
Foreign References:
US3846453A1974-11-05
US3845006A1974-10-29
JPS6210126A1987-01-19
JPS6268811A1987-03-28
JPH04175351A1992-06-23
Other References:
See also references of EP 1371672A4
None
Attorney, Agent or Firm:
Hanabusa, Tsuneo c/o Hanabusa, Patent Office Shin-ochanomizu Urbantrinity 2. (Kandasurugadai 3-chome Chiyoda-ku, Tokyo, JP)
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