发明名称 |
Paper coating pigments and their production and use |
摘要 |
<p>There is disclosed a method for the preparation of a precipitated calcium carbonate (PCC) for use as a pigment in paper coating compositions, the method comprising the steps of (a) carbonating an aqueous lime-containing medium to produce an aqueous suspension of a PCC predominantly in a selected crystal form, (b) at least partially dewatering the PCC-containing suspension; and (c) subjecting the PCC-containing suspension to comminution by high shear attrition grinding with an attrition grinding medium. Steps (b) and (c) may be applied in either order, ie. (b) followed by (c) or alternatively (c) followed by (b). The dewatering step (b) is preferably carried out using a pressure filter device operating at a pressure of at least 5MPa, preferably at least 10MPa. A pH reduction step may be applied after steps (b) and (c). Also disclosed are pigments produced by the method and pigment and paper coating compositions including such pigments.</p> |
申请公布号 |
EP0768344(A2) |
申请公布日期 |
1997.04.16 |
申请号 |
EP19960307320 |
申请日期 |
1996.10.08 |
申请人 |
ECC INTERNATIONAL LIMITED |
发明人 |
BLEAKLEY, IAN STUART;MCGENITY, PHILIP MARTIN;NUTBEEM, CHRISTOPHER;LANGDON GOLLEY, CHRISTOPHER ROBIN |
分类号 |
C01F11/18;C09C1/02;D21H19/38;D21H19/40;D21H21/52;(IPC1-7):C09C1/02 |
主分类号 |
C01F11/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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