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    • 4. 发明授权
    • Preparations of suspensions of ground particulate material
    • 研磨颗粒材料悬浮液的制备
    • US6003795A
    • 1999-12-21
    • US43053
    • 1998-07-14
    • Richard BownDavid Robert Skuse
    • Richard BownDavid Robert Skuse
    • B01F17/36B01J13/00C09C1/02C09C3/00C09C3/04C09D17/00B02C19/12
    • C09C1/02C09C3/006C09D17/004C01P2004/32C01P2004/61C01P2006/12C01P2006/22
    • There is disclosed a method of preparing a concentrated aqueous suspension of a finely ground particulate material by a multistage grinding process in which an aqueous suspension of the particulate material is passed to and treated by grinding in each of a series of grinding stages, wherein a water soluble polycarboxylate dispersing agent for the particulate material is added to the suspension at each of a plurality of dispersion agent addition sites or stages. The invention is characterised in that the aqueous suspension when treated by grinding in at least one of the grinding stages has a pH on the inclusive range 8.5 to 9.8. Using the method described, suspensions can be prepared which are rheologically stable with time, and which contain a relatively high proportion by weight of a finely divided pigment.
    • PCT No.PCT / GB96 / 02269 Sec。 371日期:1998年7月14日 102(e)1998年7月14日PCT PCT 1996年9月12日PCT公布。 出版物WO97 / 10309 日期1997年3月20日公开了一种通过多级研磨方法制备精细研磨的颗粒材料的浓缩水性悬浮液的方法,其中将颗粒材料的水悬浮液通过研磨并在一系列研磨中进行研磨处理 其中在多个分散剂添加位点或阶段的每一个处将悬浮液中加入用于颗粒材料的水溶性多羧酸盐分散剂。 本发明的特征在于,在至少一个研磨阶段通过研磨处理的水性悬浮液的pH值在8.5至9.8的范围内。 使用所述方法,可以制备随时间流变稳定的悬浮液,并且其含有相对较高比例的细碎颜料。
    • 9. 发明授权
    • Preparation of systems of ground particulate material
    • 研磨颗粒物料的制备
    • US06087404A
    • 2000-07-11
    • US43052
    • 1998-06-01
    • Richard BownDavid Robert Skuse
    • Richard BownDavid Robert Skuse
    • B01F17/36B01J13/00C09C1/02C09C3/00C09C3/10C09D17/00B02C19/12C08K3/26C09C3/04
    • C09C3/006C09C1/02C09D17/004C01P2004/32C01P2004/61C01P2006/12C01P2006/22Y10S516/928
    • There is disclosed a process for preparing a concentrated aqueous suspension of a finely ground particular material, which process comprises (a) preparing an aqueous suspension comprising at least 20% by weight of the particulate material comprising calcium carbonate in coarse particular form; (b) grinding the suspension formed in step (a) in the presence of a polycarboxylate dispersing agent for the particular material in a grinding process where the pH is not less than 10 to produce an aqueous suspension wherein at least 90% by weight of the particles or the particulate material have an e.s.d. less than 2 .mu.m and 60% by weight have an e.s.d. less than 1 .mu.m; (c) adding an additive comprising an anionic polycarboxylate dispersing agent to the suspension of ground material formed in step (b). The process is characterized in that the aqueous suspension formed in step (c) has a pH which lies within the inclusive range 8.5 to 9.8 and in that, following addition of the anionic polycarboxylate dispersing agent in step (c), the suspension is not ground further. Using the method described, suspension can be prepared which are rheologically stable with time, and which contain a relatively high proportion by weight of a finely divided pigment.
    • PCT No.PCT / GB96 / 02268 Sec。 371日期1998年6月1日 102(e)1998年6月1日PCT PCT 1996年9月12日PCT公布。 出版物WO97 / 10308 日期:1997年3月20日公开了一种制备精细研磨的特定材料的浓缩水性悬浮液的方法,该方法包括(a)制备含有至少20重量%的包含碳酸钙的颗粒材料的水性悬浮液, 形成; (b)在其中pH不小于10的研磨过程中,在用于特定材料的聚羧酸酯分散剂存在下研磨步骤(a)中形成的悬浮液,以产生水悬浮液,其中至少90重量% 颗粒或颗粒材料有一个esd 小于2微米和60重量%具有e.s.d. 小于1亩; (c)向步骤(b)中形成的研磨材料的悬浮液中加入包含阴离子多羧酸盐分散剂的添加剂。 该方法的特征在于步骤(c)中形成的水​​悬浮体的pH值在8.5至9.8的范围内,并且在步骤(c)中加入阴离子聚羧酸酯分散剂后,悬浮液不被研磨 进一步。 使用所述方法,可以制备随时间流变稳定的悬浮液,并且其含有相对较高比例的细碎颜料。