Shin-Etsu Silicone Selection Guide for Cosmetics

Surface Treated Pigments

Surface treated pigments are colored pigments that have undergone a hydrophobic treatment on their surface.
Shin-Etsu Silicone’s KTP-09 series are colored pigments whose surfaces have been treated with a treatment agent containing branched silicone chains and alkyl chains, combining high hydrophobicity with excellent dispersibility in a wide range of silicone fluids.

Molecular Structure Model of KTP-09 Series Surface Treatment Agent

It has branched silicone chains and alkyl chains, and has triethoxysilyl groups as reactive groups.
The KTP-09 series is a treatment agent with the structure shown above, which has been treated to be hydrophobic, and therefore exhibits excellent dispersibility in both silicone fluids and oils. The texture combines the smoothness of silicone with the skin-friendly properties of alkyl chains. In addition, due to its high hydrophobicity achieved by the optimal processing method, stability is expected to be improved by suppressing agglomeration and discoloration in the formulation.
Product name Ingredient Color
KTP-09R Silicone-alkyl treated red iron oxide Red
KTP-09Y Silicone-alkyl treated Yellow iron oxide Yellow
KTP-09B Silicone-alkyl treated Black iron oxide Black
KTP-09W Silicone-alkyl treated titanium dioxide White

KTP-09 Series Hydrophobic – Observation of Condition in Silicone Fluids/Water –

KF-995 (cyclopentasiloxane): Purified water: Color pigments = 10 g: 10 g: 0.05 g

After dispersing the color pigments in KF-995, add purified water, shake, and let stand to observe the condition.

The KTP-09 series remains dispersed only in silicone fluids, whereas in the case of poor treatment, the hydrophilic portion remaining on the surface of the color pigments adsorbs water, causing the silicone fluids to take in water.

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