发明名称 |
DURABLE PIGMENTS FOR PLASTICS |
摘要 |
<p>Improved alumina-coated inorganic pigments having a first coating of boehmite alumina, a second coating of amorphous alumina, and a third coating of boehmite alumina which exhibit good durability, dispersibility, and optical properties in plastic compositions are disclosed. Also disclosed is a process whereby an aqueous slurry of an alumina-containing inorganic pigment is milled to achieve a particular particle size distribution, a first coating of boehmite alumina is precipitated onto the pigment material within a first pH range, a second amount of an alumina coating agent is added to the aqueous slurry within a second pH range to obtain a second coating of amorphous alumina over the first boehmite alumina coating, and then the pH of the slurry is adjusted to a third pH range thus forming a third boehmite alumina coating over the second amorphous alumina coating.</p> |
申请公布号 |
EP0850280(A1) |
申请公布日期 |
1998.07.01 |
申请号 |
EP19970918504 |
申请日期 |
1997.03.20 |
申请人 |
KERR-MCGEE CHEMICAL CORPORATION |
发明人 |
BRAND, JOHN, R.;GREEN, KELLY, A. |
分类号 |
C09C1/40;C09C1/36;C09C3/06;(IPC1-7):C09C1/40 |
主分类号 |
C09C1/40 |
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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