For example:

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Crosslinked coating layer. Very hydrophobic; stable at pH of 3 - 9

Jojoba Ester
•Interesterification product of jojoba oil
•Chemical similar to the human skin sebum
•High oxidative stability.

Properties of treated pigments:
•Hydrophobic
•Coating is stable and does not turn rancid upon heating
•Creamy feel and good affinity to the skin
•Good pressability
•Very good for powders
•Good for natural formulation

http://www.koboproductsinc.com/Downloads/(z)Pig_Surf_Treat_I...

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Note added at 4 hrs (2014-07-12 13:14:07 GMT)
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This Carnauba Wax treatment gives coated pigments a creamy feel and good adhesion to the skin. This hydrophobic treatment is very beneficial in the use of powders and will improve pressability.
http://www.koboproductsinc.com/Treatments.html
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Unexpectedly high amounts of pigment can be incorporated in anhydrous, pigmented cosmetic compositions containing an organically substituted polysiloxane by providing the pigment in a hydrophobic silicone coating .
http://www.google.com/patents/US4578266
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TTS coated pigment floats almost indefinitely at pH 2

Crosslinked coating on pigment
Use of Dispersant as Auxiliary Coating

When used as auxiliary coating, proper dispersant can greatly
improve the dispersibility of treated pigments

http://sunjinchem.co.kr/imports/Kobo_SurfaceTreatment.pdf