| 摘要 |
<p>ALKALINE EARTH METAL CARBONATE EXHIBITING A RESISTANCE TO ACIDS EXPRESSED AS PH OF LESS THAN 7 MEASURED AFTER SUSPENDING 1.0 G OF THE PARTICLES IN A MIXTURE MADE OF 20 ML OF TOLUENE AND 80 ML OF AN AQUEOUS PHASE CONSISTING OF DEIONIZED WATER, 11.76 G/L OF CITRIC ACID MONOHYDRATE, 2.57 G/L OF NACI AND 0.068 MOL/L OF NAOH, AFTER 35 MINUTES OF STIRRING AT 25 °C AND AT 1000 RPM, OR EXPRESSED AS A MOISTURE PICK-UP LOWER THAN OR EQUAL TO 2 G WATER/KG OF CALCIUM CARBONATE AFTER ONE WEEK OF STORAGE AT 22 °C AND 50% RELATIVE HUMIDITY, OR AS A DIFFERENTIAL SCANNING CALORIMETRY (DSC) SPECTRUM SHOWING AT LEAST ONE PEAK BETWEEN 170 AND 190 °C WHEN MEASURED AT A HEATING RATE OF 10 °C/MIN UNDER NITROGEN ATMOSPHERE FROM 25 TO 250 °C IN OPEN CELLS. PROCESS FOR THE PREPARATION OF SAID PARTICLES, COMPOSITIONS CONTAINING SAID PARTICLES AND THE USE THEREOF.</p> |
