| 摘要 |
An abrasive composition is provided based on the following: <tables id="TABLE-US-00001" num="00001"> <table frame="none" colsep="0" rowsep="0"> <tgroup align="left" colsep="0" rowsep="0" cols="3"> <colspec colname="offset" colwidth="21pt" align="left"/> <colspec colname="1" colwidth="126pt" align="left"/> <colspec colname="2" colwidth="70pt" align="left"/> <THEAD> <ROW> <ENTRY/> <entry namest="offset" nameend="2" align="center" rowsep="1"/> </ROW> </THEAD> <TBODY VALIGN="TOP"> <ROW> <ENTRY/> <ENTRY>an abrasive, preferably feldspar</ENTRY> <ENTRY> 7-59%</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>a clay, preferably smectite clay</ENTRY> <ENTRY> 3-7%</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>water</ENTRY> <ENTRY> 37-64%</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>an organic solvent, such as kerosene</ENTRY> <ENTRY> 3-20%,</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>and additionally, preferably contains</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>calcium carbonate</ENTRY> <ENTRY> 20-30%, and</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>a surfactant</ENTRY> <ENTRY>0.01-1%.</ENTRY> </ROW> <ROW> <ENTRY/> <entry namest="offset" nameend="2" align="center" rowsep="1"/> </ROW> </TBODY> </TGROUP> </TABLE> </TABLES> The composition may have particles of up to 100 mum, and preferably average particle size diameter of 30-45 mum.
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