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    • 19. 发明授权
    • Preparation of spherical, hard mono- or oligodisperse particles of
melamine resin
    • MELAMINE树脂的球形,硬单体或OLIGODISPERSE颗粒的制备
    • US5162486A
    • 1992-11-10
    • US575563
    • 1990-08-31
    • Heinrich FollmannDietrich HoffmannWolfgang Sliwka
    • Heinrich FollmannDietrich HoffmannWolfgang Sliwka
    • C08J3/03C08G12/32C08G12/38C08G12/40C08G12/42C08J3/12C08L61/20C08L61/28
    • C08G12/32
    • Spherical, hard mono- or oligodisperse particles of diameter from 0.1 to 100 .mu.m are prepared by condensation of partially etherified melamine-formaldehyde precondensates which form a clear solution in water in every ratio, in an aqueous solution of a water-soluble polymer which has strongly acid groups and a K value of from 100 to 160, at pH 3 to 6 and at 20.degree. to 100.degree. C., and condensation of the resulting cloudy solution is continued until the precondensate has been consumed, resulting in a dispersion of the particles. The dispersion is neutralized. The particles can be used in the form of the aqueous dispersion or after isolation from the dispersion.The particles are spherical, hard and non-swellable and can be used, for example, as sizes for plastics, polishes, delustrants, extruders and/or as pigment.The process makes it possible to produce particles of predetermined size and size distribution.
    • 通过在水溶性聚合物的水溶液中以各种比例在部分醚化的三聚氰胺 - 甲醛预缩合物中缩合形成直径为0.1至100μm的球形,硬质单分散或少分散颗粒, 强酸基,K值为100至160,pH 3至6和20至100℃,并持续进行所得浑浊溶液的冷凝,直到预缩合物消耗,导致分散 粒子。 分散体被中和。 颗粒可以以水分散体的形式使用或在与分散体分离之后使用。 颗粒是球形的,硬的和不溶胀的,并且可以用作例如塑料,抛光剂,消泡剂,挤出机和/或颜料的尺寸。 该方法可以产生预定尺寸和尺寸分布的颗粒。