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    • 19. 发明专利
    • FINE-PARTICLE-DISPERSION COATING FLUID AND ITS PRODUCTION
    • JPH0953039A
    • 1997-02-25
    • JP22610795
    • 1995-08-11
    • DAINIPPON PRINTING CO LTD
    • HIROI JUNICHIHARADA NOBUYUKINAKAJO SHIGEKI
    • B41M5/382B41M5/40C09D11/00C09D11/02C09D11/10
    • PROBLEM TO BE SOLVED: To prevent the settling of fine particles during long storage and during coating to stabilize the quality by using a fine particle mixture prepd. by using, as the dispersion medium, a liq. substance contg. a solid component in a specified concn. or higher. SOLUTION: A fine particle mixture 3 is obtd. by using, as the dispersion medium, a liq. substance 1 comprising a lubricant, a mold release agent, a surfactant, a resin having low mol.wt. and glass transition point, etc., and having a solid content of 90% or higher and by dispersing fine particles 3 comprising various inorg. and org. fine particles with a three-roll mill 4 in the liq. substance 1. Pref. the peripheral speed ratios, clearances, and temps. of the rolls of the mill 4 during dispersing are properly adjusted according to the viscosity of the medium, the sizes and hardnesses of the fine particles, etc. A three-roll mill is usually used for dispersing an ink with a relatively high viscosity, unlike such a mill for ink production as a sand mill or a ball mill. Since the number of revolutions of each roll of the mill 4 is different from those of other rolls, the ink is subjected to a high shearing force and the dispersion of the fine particles, etc., is enhanced; however, frictional heat is liable to be generated, requiring cooling water to be passed through the rolls to cool them.