The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 26, 2003
Filed:
Dec. 28, 2001
Yasuhiro Yamamoto, Himeji, JP;
Shuji Shimizu, Himeji, JP;
Masafumi Inoue, Himeji, JP;
Hideki Oishi, Himeji, JP;
Nippon Shokubai, Co., Ltd., Osaka, JP;
Abstract
A process for producing amino resin particles includes: a reaction process for obtaining a reaction solution containing an amino resin precursor which is obtained by a reaction of an amino compound with formaldehyde, and having a viscosity in a range of from 2×10 Pa·s to 5.8×10 Pa·s at a temperature in a range of from 95° C. to 98° C.; an emulsion process for obtaining an emulsion by emulsifying the reaction solution; and a curing process for curing the amino resin precursor in the emulsion state by adding a catalyst to the emulsion. With this producing process, it is possible to readily produce amino resin particles with an essentially uniform particle size (narrow particle size distribution). Further, with use of an aqueous dispersion of an inorganic pigment which is obtained by wet pulverizing the inorganic pigment in an aqueous medium until the average particle size of the inorganic pigment measured by a light scattering method becomes not more than 300 nm, it is possible to obtain amino resin particles with superior properties in coloring strength, visibility, heat resistance, solvent resistance, and chemicals resistance.