Process for manufacturing thermosetting resin particles
AssigneeNippon Paint Co., Ltd.
InventorsHaruhiko Sato, Yutaka Harada
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AssigneeNippon Paint Co., Ltd.
InventorsHaruhiko Sato, Yutaka Harada
Estimating the term…
Thermosetting resin particles having a narrow particle size distribution useful for powder coating application are produced by the steps of (a) providing a first water-soluble polymer having a cloud point within the range between 30.degree. C. and 90.degree. C. and a second water-soluble polymer not having any cloud point; (b) preparing an aqueous suspension in which an organic solvent-containing, liquid thermosetting resin composition is suspended as primary particles of oil droplets in an aqueous suspension medium containing the first and second water-soluble polymers, (c) heating the suspension to a temperature higher than the cloudy point to allow the oil droplets to agglomerate into secondary particles of larger particle sizes, (d) removing the organic solvent contained in the particles during or after step (c) and optionally (e) recovering the particles.
A process for manufacturing thermosetting resin particles comprising
A process for the production of thermosetting resin particles, comprising heating an aqueous suspension of an organic solvent-containing, liquid thermosetting resin composition suspended as primary particles of oil droplets having a number average particle size of less than 10 .mu.m in a dispersing medium containing a first water-soluble polymer having a cloud point of 30.degree.-90.degree. C. and a second water-soluble polymer not having any cloud point, from a temperature below to a temperature above the cloud point of the first water-soluble polymer, whereby the primary particles agglomerate and fuse into secondary particles having a number average particle size from 2 to 20 times greater than that of the primary particles.
Dependencies are inferred from the claim text.