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    • 7. 发明公开
    • METHOD FOR PRODUCING CARBONATE
    • VERFAHREN ZUR HERSTELLUNG VON CARBONAT
    • EP1785397A1
    • 2007-05-16
    • EP05745819.2
    • 2005-06-01
    • FUJIFILM CORPORATION
    • KAWANO, Tetsuo, c/o FUJIFILM Corporation
    • C01F11/18C01G9/00C01G21/14
    • C01F11/187C01B32/60C01F11/181C01G9/00C01G21/14C01P2002/72C01P2004/03C01P2004/04C01P2004/10C01P2004/12C01P2004/54
    • To provide a process for producing carbonate particles, capable of efficient, easy formation of carbonate particles which have high crystallinity, less prone to agglomeration and offer orientation birefringence, particularly carbonate particles that are needle- or rod-shaped, and of controlling the particle size. In the process a metal ion source and a carbonate ion source are heated together in a liquid of 55°C or higher for reaction to produce carbonate particles with an aspect ratio of greater than 1, wherein the metal ion source contains at least one metal ion selected from the group consisting of Sr 2+ , Ca 2+ , Ba 2+ , Zn 2+ and Pb 2+ . The carbonate particles are preferably needle- or rod-shaped, pH of the liquid after heating reaction is preferably 8.20 or more, and in its X-ray diffraction spectrum the full-width at half maximum of the diffraction peak corresponding to (111) plane is preferably less than 0.8°.
    • 为了提供一种生产碳酸盐颗粒的方法,其能够高效,容易地形成具有高结晶度的碳酸盐颗粒,较不易于聚集并提供取向双折射,特别是针状或棒状的碳酸盐颗粒以及控制颗粒尺寸 。 在该过程中,金属离子源和碳酸根离子源在55℃或更高的液体中一起加热以反应生成纵横比大于1的碳酸盐颗粒,其中金属离子源包含至少一种金属离子 由Sr 2+,Ca 2+,Ba 2+,Zn 2+和Pb 2+组成。 碳酸盐颗粒优选为针状或棒状,加热反应后的液体的pH优选为8.20以上,在X射线衍射光谱中,与(111)面对应的衍射峰的半峰全宽 优选小于0.8。