Conopco, Inc.

Shuhong Yu

Wei Zhang

Shuqi Zhu

Zhao Pan

Huailing Gao

Disclosed a method of preparing composite particles comprising a non-porous spherical particulate inorganic material deposited on a plate-like inorganic material, where refractive index of said particulate inorganic material is greater than that of said plate-like inorganic particulate material, wherein, said spherical material occupies 20 to 80% of total surface area of said plate-like material and wherein the amount of said spherical material accounts for 2 to 20 wt % of said composite particles, further wherein said plate-like inorganic material is mica and said non-porous spherical particulate inorganic material is silicone dioxide, said method comprising the steps of: (iv) silanization of said plate-like inorganic material to get a silanized material having functional groups 'A'; (v) silanization of said non-porous spherical particulate inorganic material to get a silanized material having functional groups 'B', where A&#x2260;B; and where said &#x201c;A&#x201d; and said &#x201c;B&#x201d; are capable of reacting with each other such that by way of their reaction, said non-porous spherical particulate inorganic material deposits on said plate-like inorganic material; and, (vi) reacting said silanized material having functional groups &#x201c;A&#x201d; with said silanized material having functional groups &#x201c;B&#x201d;.

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Hefei, China

Shuhong Yu