| 摘要 |
A particulate hydrous mineral suitable for use as an opacifying pigment, filler or extender has a shape factor which is greater than S, where S is defined by Equation 1 as follows:<paragraph lvl="0"><in-line-formula>S=(d50/0.036)+20 Equation 1;</in-line-formula>where d50 is the mean particle size of the particles of the mineral measured in microns. The particulate mineral is preferably a kaolin, which is particularly suitable for use in aqueous matt paint compositions.
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