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Posted August 3, 2012 by Style&Faith in Hair Care
 
 

Ingredient Technology – Alcohols and Hair

alcoholAlcohols by definition maybe defined as a compound that has a hydroxyl group attached to a carbon atom. By large alcohols are used in many industries and have a number of different uses.  In the beauty and cosmetic industry, alcohols may be used as a solvent or as an emollient.    Alcohols fall under two categories – short chain and long chain alcohols.

Short chain alcohols are typically composed of fewer carbons (less than 3 carbons) in the tail.   Because of the structure of these alcohols, they are flammable, volatile and quickly dissipate (evaporate).   Typical short chain alcohols used in hair products are ethanol, SD alcohol, SD alcohol 40, Isopropyl alcohol, Propyl alcohol, and Alcohol Denat.

Longer chain alcohols are composed of many carbon atoms.   The difference in the molecular composition of some selected short and long chain alcohols are reported in Tables 1 and 2.

Table 1. Selected short chain alcohols

Short chain alcohols Molecular formula Molecular weight (g)
Ethanol C2H6O 46.07 g
Isopropyl alcohol C3H8O 60.1 g

Table 2. Selected long chain (fatty) alcohols

Fatty alcohol

Molecular formula

Molecular weight (g)

Cetyl alcohol

C16H34O

242.44

Lauryl alcohol

C12H26O

186.34

Stearyl alcohol

C18H38O

270.49

Cetearyl alcohol

C16H34O

242.44

Myristyl alcohol

C14H30O

214.39

Behenyl alcohol

C22H46O

326.6 g

 

 

 

 

 

Alcohols and Hair

Are alcohols really drying to the hair?   Short chain alcohols are typically more drying to the hair.   This is largely in due to their small structural composition, allowing them to behave more as a solvent.  Because they are solvents, they dissipate easily when applied to the hair and once they dissipate, the hair is left dry with no moisture.   Table 3 is gives some examples of hair products containing alcohols which dry the hair out.  These types of products are generally styling sprays and spritzs.

Table 3. Selected Hair Products Containing Short-Chain Alcohols

Isoplus 24-hour  Hold Spray
Organic Root Simulator Herbal Cleanse
Isoplus Hot Curler Thermal Spray
Motions Salon Hair Care Hold and Shine Styling Spray
Cantu Shea Butter Flat Iron Spray
IC Fantasia Firm Hold Spray
IC Fantasia Super Hold Polisher Spritz
BB Pump-it-up Styling Spritz
Pink Lusters Spritz

Many hair products contain longer chain alcohols that aid in conditioning the hair.  Longer chain alcohols are called fatty alcohols because their consistency is generally a cream like emollient, which aid in conditioning and softening the hair. Table 4. gives an example of long-chain alcohols found in different hair products. They are generally in conditioners, moisturizers and leave-ins.

Table 4. Selected Hair Products Containing Long-Chain Alcohols

Hollywood Beauty Carrot Cholesterol
Elasta QP Mango Butter
Organic Root Stimulator Olive Oil Hair Masque
Pantene Relxed and Natural Conditioner
Motions CPR Triple Action Leave-In Conditioner
Motions Naturally You Deep Conditioning Masque
Motions Naturally You Smoothing Conditioner
Cantu Shea Butter Leave-In Conditioning Repair Cream
Cream of Nature Intensive Conditioning Treatment
Herbal Essence Long Term Relationship Split End Leave-In Protector
Nexxus Humectress Ultimate Moisture Conditioner
Silicon Mix Nutritive Hair Treatment
Aussie 3-Minute Miracle

So, not all alcohols are equal and their application in hair products depends on their structural make-up. If you are looking for a product that will soothe and soften the hair, try out some of the many products containing long chain alcohols.


Style&Faith