| 摘要 |
<p>A particulate alkaline earth metal carbonate material product has on its particles a coating consisting of two components: 1) a first coating comprising an aliphatic fatty acid and; 2) a second coating comprising an ester or earth alkaline salt of an aliphatic fatty acid. The second component has a substantially higher carbonate release temperature than the first coating agent. The amount of the first component may be insufficient to produce more than a monolayer, but the total amount of the first and second coating agent may exceed the required amount. The first component comprises stearic acid and the second component may comprise calcium distearate.</p> |
