| 发明名称 |
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| 摘要 |
<p>Large crystals of a silica polymorph having a characteristic X-ray diffraction pattern, a specific gravity of 1.70 +/- 0.05 g/cc. and a mean refractive index of 1.39 +/- 0.01 after calcination in air at 600 DEG C., are prepared by a hydrothermal process in which fluoride anions are included in the reaction mixture. The crystals, which can be as large as 200 microns, exhibit a substantial absence of infrared adsorption in the hydroxyl-stretching region and also exhibit an exceptional degree of hydrophobicity.</p> |
| 申请公布号 |
DE2743143(B2) |
申请公布日期 |
1979.07.19 |
| 申请号 |
DE19772743143 |
申请日期 |
1977.09.24 |
| 申请人 |
UNION CARBIDE CORP., NEW YORK, N.Y. (V.ST.A.) |
发明人 |
FLANIGEN, EDITH MARIE, WHITE PLAINS;PATTON, ROBERT LYLE, KATONAH |
| 分类号 |
C01B33/12;B01D53/02;B01J20/10;C01B37/02;C01B39/06;(IPC1-7):C01B33/12 |
主分类号 |
C01B33/12 |
| 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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