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Amodimethicone
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In the ingredient descriptions: Good means that I like to see this in a product's list of ingredients. Okay means this product appears safe for a curly person like me to use. Caution means that this ingredient may not be good in some hair care products, or for some people. Avoid means this ingredient may hurt your hair. If you see this ingredient in a hair product, it's best to put it down and walk away.

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Amodimethicone    (aka Amine functional siloxane)
Caution
Used for conditioning, and makes it easier for a comb to glide through the hair. A type of silicone [Begoun (Cosmetics) pg 1247]. Amodimethicone is only used as a mixture with Tallowtrimonium chloride and Nonoxynol-10. This makes it an emulsion, so it can be used in a water-based products (Amodimethicone by itself is not water soluble). This is one of the lighter silicones because it's a mixture, and studies have found that it tends not to build up in the hair with repeated use [Hunting (Conditioning) pg 110]. This belongs to the Amino functional group of siloxanes. Though considered excellent hair conditioners, they are known to be irritating to the skin [Schueller pgs 179-180].—I'm putting this as a caution because one of the ingredients in this mixture, Tallowtrimonium chloride, has Isopropanol in it, which can be drying, and it's also very irritating to eyes and skin. This would be fine in something you would rinse out, or if it's pretty far down on the ingredient list. But I'd be really cautious about using this on a child, or if you have very sensitive skin.—T
See also: Silicone Tallowtrimonium chloride Emulsion Nonoxynol-10 Amine functional siloxane
Source(s): Begoun Hunting Schueller http://asksilicone.com/pdfs/Amino_Silicones.pdf. http://www.naturallycurly.com/curlreading/curly-q-a/curlchemist-amodimethicone-and-other-amine-functionalized-silicones



References:

Applewhite, Thomas H., ed. Proceedings of the World Conference on Lauric Oils: Sources, Processing, and Applications
AOCS Publishing, 1994.

Barel, André O., Marc Paye, and Howard I. Maibach., eds. Handbook of Cosmetic Science and Technology, Second Edition
Marcel Dekker, Inc., 2001.

Begoun, Paula. Don’t Go Shopping for Hair-Care Products Without Me. 3rd Edition.
Renton: Beginning Press, 2005.

Begoun, Paula. The Beauty Bible.
Renton: Beginning Press, 2002.

Begoun, Paula. Don’t Go to the Cosmetics Counter Without Me.
Renton: Beginning Press, 2003.

Bellum, Sarah, ed. The Beauty Brains: Real Scientists Answer Your Beauty Questions
New York: Brains Publishing, 2008.

Gottschalk, Tari E. and McEwen, Gerald N, Jr. PhD, eds. International Cosmetic Ingredient Dictionary and Handbook, Tenth Edition 2004, Volumes 1-4.
Washington D. C.: The Cosmetic, Toiletry, and Fragance Association, 2004.

Halal, John Hair Structure and Chemistry Simplified, Fifth Edition
Albany: Milady, 2002.

Hunting, Anthony L.L. Encyclopedia of Conditioning Rinse Ingredients.
Cranford, NJ: Micelle Press, Inc., 1987.

Hunting, Anthony L.L. Encyclopedia of Shampoo Ingredients.
Cranford, NJ: Micelle Press, Inc., 1983.

Nnanna, Ifendu A. and Jiding Xia., eds. Protein-Based Surfactants: Synthesis: Physicochemical Properties, and Applications (Surfactant Science)
Madison Heights: CRC, 2001.

Quadflieg, Jutta Maria. Fundamental properties of Afro-American hair as related to their straightening/relaxing behaviour.
Diss. U of Rheinisch-Westfälischen Technischen Hochschule Aachen, 2003.

Schueller, Randy and Perry Romanowski, eds. Conditioning Agents for Hair and Skin.
New York: Marcel Dekker, Inc., 1999.

Winter, Ruth M.S. A Consumer's Dictionary of Cosmetic Ingredients: Complete Information About the Harmful and Desirable Ingredients Found in Cosmetics and Cosmeceuticals
New York: Three Rivers Press, 2005.

Zviak, Charles., ed. The Science of Hair Care (Dermatology)
New York: Marcel Dekker, Inc., 1986.

 

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