Patent ID: 7378153
Filing Date: 2008-05-27
Classification: C08G,C08J,C08L,Y10T

Abstract:
1. An amino resin composite particle, in which an inorganic compound is fixed as a child particle on a surface of an amino resin particle serving as a mother particle, and in which at least part of the child particle composed of the inorganic compound is substantially embedded in the surface of the amino resin particle with high shear force, the amino resin composite particle having a firm-adhering ratio of the inorganic compound of 10% or more, which is calculated out by the following equation: where A is the weight of the inorganic compound fallen off from the surface of the amino resin composite particle by mixing a suspension containing as a solid content 10% the amino resin composite particle by weight at an impeller tip speed of 5.2 m/s, and B is a weight of the inorganic compound in the amino resin composite particle before the mixing, the weight B being determined by a content by percentage of the inorganic compound in the amino resin composite particle, the content by percentage of the inorganic compound in the amino resin composite particle ranging from 1% to 30% by weight, by mixing an aqueous dispersion, in the presence of an emulsifier, with the high shear force application, the aqueous dispersion containing (I) at least one of (XX) an amino resin precursor to be the amino resin particle, (YY) a partially-hardened amino resin precursor to be the amino resin particle, and (ZZ) an amino resin particle, on which the inorganic compound is to be fixed, and (II) an inorganic compound to adhere thereon, in such a manner that (I) the at least one of (XX) the amino resin precursor, (YY) the partially-hardened amino resin precursor, and (ZZ) the amino resin particle, and (II) the inorganic compound are dispersed in water; wherein: (i) the shear force is applied to mix the aqueous dispersion, by using a blade revolving at an impeller tip speed in a range between 2 m/s and 30 m/s, so as to shear, in the presence of an emulsifier, (I) the at least one of (XX) the amino resin precursor, (YY) the partially-hardened amino resin precursor, and (ZZ) the amino resin particle, and (II) the inorganic compound, while (I) the at least one of (XX) the amino resin precursor, (YY) the partially-hardened amino resin precursor, and (ZZ) the amino resin particle, and (II) the inorganic compound are dispersed in water; (ii) the shear force is applied to mix the aqueous dispersion, by colliding against each other at a discharging pressure between 3 MPa and 49 MPa, in the presence of an emulsifier, (I) the at least one of (XX) the amino resin precursor, (YY) the partially-hardened amino resin precursor, and (ZZ) the amino resin particle, and (II) the inorganic compound, while (I) the at least one of (XX) the amino resin precursor, (YY) the partially-hardened amino resin precursor, and (ZZ) the amino resin particle, and (II) the inorganic compound are dispersed in water; or (iii) the shear force is applied to mix the aqueous dispersion, by introducing or forcibly circulating, at a discharging pressure of 0.1 MPa to 1.47 MPa, in the presence of an emulsifier, (I) the at least one of (XX) the amino resin precursor, (YY) the partially-hardened amino resin precursor, and (ZZ) the amino resin particle, and (II) the inorganic compound, in a bath tank of a mixing apparatus, the bath tank being provided with a baffle plate for turning a flow direction by 90 degrees, while (I) the at least one of (XX) the amino resin precursor, (YY) the partially-hardened amino resin precursor, and (ZZ) the amino resin particle, and (II) the inorganic compound are dispersed in water; the inorganic compound has an average particle diameter 0.05 to 0.001 times that of the amino resin particle as the mother particle; the amino resin particle has an average particle diameter within a range of 1 μm to 30 μm, the inorganic compound has an average particle diameter within a range of 0.001 μm to 1.5 μm, and the average particle diameter of the mother particle is greater than that of the child particle.