Do rinse-off cleansers benefit from adding silicones?

I tried adding 0.5% Dow 8170 amodimethicone emulsion (for 0.1% net amodimethicone content) and sometimes I felt some slight improvement and better afterfeel. I'll need to conduct some blind tests to confirm that.

Are silicones beneficial in skin cleansers?

Literature doesn't say much about it:


Cosmetic Usage of Silicone Fluids
There are several cosmetic usages of silicone fluids, as shown in Table 2.8. Silicone fluids are used in low concentrations in many applications. The reason for this relates to their hydrophobicity, which results in their deposition on skin.
This deposition has many desirable properties. Silicone fluids can be used to remove tacky organic products, like soaps, from the skin, while providing lubrication and a skin feel that is highly desirable.
While the mechanism of use is the same and independent of the viscosity chosen, the properties of the cosmetic product made with the different viscosity silicones are quite different. The skin feel can be altered significantly by picking the proper silicone fluid. Higher molecular weight products have an oilier feel on the skin, while lower viscosity products have a dryer feel on the skin. Silicone fluids with viscosity over 200 cSt are not soluble in alcohols, while products with lower viscosity are alcohol-soluble.
One key limitation on the use of silicone fluids in formulation is the fact that the concentration needs to be kept very low. The very same insolubility that is a consequence of the hydrophobicity and drives the deposition places severe limitations on the useful concentrations. If too much silicone fluid is used, it will result in a product that will separate, have difficulty foaming and lack the most basic aesthetics for a personal care product. Skilled formulation helps, but modification of the product and introducing organofunctionality into the product is a good way to overcome the shortcomings of silicone fluids.
Table 2.8. Cosmetic Use of Silicone Fluids
Skin Cleanser Lubricity 0.1–0.5%
Wetting 0.1%
http://www.scientificspectator.com/documents/book service/Anthony O'Lenick Silicones for Personal Care.pdf
(pages 48-49)


Conclusion
A new emulsion technology developed and patented by Dow Corning has been evaluated for improving the sensory profile of shower gel products. The positive impacts are on both the foam quality and the dry skin after-feel. It has been found that the best emulsion has a low particle size and a very high internal linear polymer viscosity, a combination that can only be produced using this new technology.
The mechanism for this performance has been identified: an improved deposition with a low particle size combined with a lower sensory threshold due to a high internal polymer viscosity. The deposition  evel has been quantified to be approximately 0.0023 mg/cm2.
In addition, it has been demonstrated that sensory performance is expected to be increasingly perceivable with use frequency of the shower gels, and also that the silicone deposited from the shower gel could potentially also protect the skin during the time necessary for rebuilding its natural barrier. 

Comments

  • hah this is the book I have been reading during my everyday commute to work for about a year already (and probably will be reading for another two years) I think the point is about non watersoluble silicones.These amodimethicone emulsions can be quite different apparently. I tried Amodimethicone (and) Trideceth-12 (and) Cetrimonium Chloride and Amodimethicone (and) C11-15 Pareth-5 (and) C11-15 Pareth-9 and the second one is much stronger. Your blend has water as a first ingredient which makes me think it’s less concentrated so maybe you need more. I can see a clear difference with amodimethicone and it doesn’t impact foaming.
  • chemicalmattchemicalmatt Member, Professional Chemist
    You be they do...if you are formulating them correctly. There are several deposition considerations and additives that are critical for dimethicones to work well upon rinse-off. Read up, my friend.
  • MeryMery Member
    edited December 2019

    There are many claims that silicone may benefit sensitive skin, some of which actually have scientific backing to back them up. However, it is important to know the correct way to use a silicone cleanser before you purchase so you're not wasting money, or more importantly time, doing something you won't like. I would urge you to read and learn more about using cleansing products in your skin care routine for sensitive skin types; it doesn't get much simpler than that!

    I've always tried to keep up with the latest in the chemical exfoliating cleanser, so please let me know if there is an alternative that is a better option for sensitives!


  • You be they do...if you are formulating them correctly. There are several deposition considerations and additives that are critical for dimethicones to work well upon rinse-off. Read up, my friend.
    Thank you.
    I have been reading a lot but so far I haven't found anything about silicone deposition on skin.
    On hair, then yeah a lot of tech stuff, but not for skin.

    So the same principles apply to both skin and hair silicone deposition?
  • chemicalmattchemicalmatt Member, Professional Chemist
    Affirmative, Gunther. Keratin is keratin, only hair is more porous then skin and nails.


  • Thank you.
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