| 摘要 |
PROBLEM TO BE SOLVED: To improve the fluidity of a heat-curable powder coating material by using a crystalline epoxy resin with a specific average particle diameter and a specific melting point and a spherical fine particle with a specific average particle diameter as ingredients and limiting the weight ratio of the crystalline epoxy resin to the spherical fine particle in the range of a specific value. SOLUTION: This fluidity modifier for a heat-curable powder coating material is constructed of a spherical fine particle such as an organic spherical fine particle of acrylic resin with an average particle diameter of 5-50 nm or the like or an inorganic spherical fine particle of silica, alumina or the like and so forth, and a crystalline epoxy resin with an average particle diameter of 0.1-20μm and a melting point of 100 deg.C or higher. When using the crystalline epoxy resin and the spherical fine particle, these are present in the ratio of 99:1-20:80 in terms of weight and the fluidity of the heat-curable powder coating material can be controlled by regulating their blending quantities optionally. Especially, it is possible to control the melt flow properties by regulating the blending quantity of the crystalline epoxy resin optionally. Thus, the fluidity of the heat-curable powder coating material can be changed by regulating their blending quantities in accordance with their applications for use or the like.
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