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Formulating with low viscosity silicone fluids blends

IP.com Disclosure Number: IPCOM000238517D
Publication Date: 2014-Sep-02
Document File: 4 page(s) / 89K

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The IP.com Prior Art Database

Abstract

13 blends of capryly methicone and low viscosity dimethicone fluids with viscosity ranges from 2cS to 10cS were tested against cyclopentasiloxane, a popular silicone oil for light feel, for pigment dispersion efficacy, volatility and as a component of W/Si formulas’ oil phase. The pigment dispersion efficacy was tested by measuring a viscosity of a pigment/fluid mixture at 1:1 ratio. There was no significant difference between all samples. The volatility of the blends was, as expected, much lower than that of cyclopentasiloxane. The blends were easily incorporated into oil/silicone phase of W/Si emulsions. The W/Si emulsions with pigment in a selected formula yielded a lower viscosity (3400 to 3860 cP) compared to the one with cyclopentasiloxane (6680 cP). When tested using a standard W/Si formula containing two selected blends without pigments the sample with the oil sum greater than 23% showed oiling developing within a day. The viscosity at the oil sum of 23% was 3900 and 3700cPs.

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Formulating with low viscosity silicone fluids blends

Author: Christina Hyunjung Kim    Dow Corning Korea

Abstract

13 blends of capryly methicone and low viscosity dimethicone fluids with  viscosity ranges from 2cS to 10cS were tested against cyclopentasiloxane, a popular silicone oil for light feel,  for pigment dispersion efficacy, volatility and as a component of W/Si formulas’ oil phase. The pigment dispersion efficacy was tested by measuring a viscosity of a pigment/fluid mixture at 1:1 ratio. There was no significant difference between all samples. The volatility of the blends was, as expected, much lower than that of cyclopentasiloxane. The blends were easily incorporated into oil/silicone phase of W/Si emulsions. The W/Si emulsions with pigment in a selected formula yielded a lower viscosity (3400 to 3860 cP) compared to the one with cyclopentasiloxane (6680 cP). When tested using a standard W/Si formula containing two selected blends without pigments the sample with the oil sum greater than 23% showed oiling developing within a day. The viscosity at the oil sum of 23% was 3900 and 3700cPs.

Introduction

Cyclic silicones such as cyclopentasiloxane are a popular ingredient in formulating cosmetic products. The uses of these materials can be found in numerous examples of currently selling cosmetic products ranging from skin care to color cosmetic. In recent years, there was an increased interest in using other low viscosity silicones oils for imparting light feel to formulations. In this study, various blends of low viscosity silicone fluids containing caprylyl methicone and dimethicones with viscosity ranges from 2 cS to 10 cS were evaluated for different formulating possibilities and also compared with cyclopentasiloxane.

Testing Materials

13 different blends of caprylyl methicone and dimethicone fluids with viscosity ranges from 2cS to 10cS were made with 20 to 70 % of Caprylyl methicone, the rest of the blend being Dimethicone fluids making up the rest.

Results

1.      Evaluation of the blends

1-1.            Pigment dispersion

One of simplest ways of determining the pigment dispersion efficacy is to measure the viscosity of pigment dispersion. When the blends and hydrophobic treated pigments were made at 1:1 ratio the resulting viscosity ranged from 2700 cP to 3400 cP.  When the same was done with cyclopentailoxane the viscosity was 3900 cP. The difference is not large enough to be significant so it can be concluded that the pigment dispersion efficacy may be similar between blends and cyclopentasiloxane. They all started to settle after one day.

The mixing conditions were at 2000 rpm for 15 min. The viscosity was measured using a Brookfiled, RTV/10 rpm, spindle number 4.

1-2.            Volatility of the blend vs Cyclopensiloxane

As expected from the volatility of dimethicones and caprylyl methicone the volatility of the blends is much higher than that of cyclopentasiloxane.

Figure 1.  Volatility of selected blend and D5 (31C, 16-17 mg)

2.      Formulati...