| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat insulating agent comprising surface-treated hydrotalcite excellent in heat insulating property, transparency, and acid resistance, and to provide a method for producing such a heat insulating agent and the use of the same to an agricultural film. SOLUTION: A coating comprising hydrous silica is formed on the surface of each hydrotalcite particle by adding a water-soluble silicate to a slurry including hydrotalcite particles at a temperature within the range of 60-100°C, and then adding an acid to the slurry. The heat insulating agent comprising hydrotalcite having a coating of dense silica on the surface in an amount of 1-50 wt.%, obtained by subjecting the resulting slurry of hydrotalcite to hydrothermal treatment at a temperature within the range of >100 to 300°C, is provided. Further, an agricultural film containing such a heat insulating agent is also provided. COPYRIGHT: (C)2006,JPO&NCIPI
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