Get a Free 5ml Mini Now Free 5ml Mini With Every Order of The Mantle
Moumoujus

SOYTRIMONIUM CHLORIDE.

Valuable CAS 61790-41-8 / ANTISTATIC, HAIR CONDITIONING, PRESERVATIVE, SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING

Soytrimonium Chloride is a cationic polymer derived from hydrolyzed soy protein, serving as a multi-functional ingredient in formulations. It is valued for its ability to reduce static electricity, stabilize emulsions, and condition hair, while also offering mild surfactant and preservative properties.

Summary

antistatic hair conditioning preservative surfactant - cleansing surfactant - emulsifying

Science

Mechanism of Action

As a quaternary ammonium salt, Soytrimonium Chloride functions as an antistatic agent by neutralizing electrical charges on surfaces. It also acts as a cationic surfactant and emulsifier, reducing surface tension to enable stable blends of immiscible liquids like oil and water. For hair, it provides conditioning benefits by forming a film that smooths cuticles, enhancing combability, softness, and shine. Its preservative action inhibits the growth of microorganisms in cosmetic products.

Research

Clinical Evidence

Insufficient-data confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 6 – 9
0 7 14

Stability

Optimal stability for a 10% solution is observed within a pH range of 6.0 to 9.0, with a typical pH of 8.3. Degradation of the quaternary amine structure to tertiary amines can occur slowly in strong alkaline solutions (pH > 7), leading to diminished effectiveness. Stability under oxidative conditions is a concern, with potential for amine release and hydroperoxide formation.

Conflicts

  • Oxidative conditions (potential for degradation and by-product formation)
  • Strong alkaline solutions (pH > 9, potential for chemical instability)
  • Combinations with other quaternary ammonium compounds (potential for increased skin irritation)

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
3%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) deems Soytrimonium Chloride safe for cosmetic use, subject to concentration limitations, distinguishing between leave-on and rinse-off applications. The Scientific Committee on Consumer Safety (SCCS) considers it safe for use in oxidative and non-oxidative hair colorant products at a maximum on-head concentration of 3.0% (when not used as a preservative). Clinical studies at 3.015% and 60.3% concentrations indicated a slight to minimal potential for skin irritancy. Concerns exist regarding possible amine release and hydroperoxide formation from its components under oxidative conditions.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
No Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Soytrimonium Chloride is a valuable multi-functional cationic agent, effective for conditioning, emulsifying, and static reduction, provided it is formulated within its specified concentration limits and pH range to ensure stability and minimize irritancy potential.

Related

Similar Ingredients

Finding similar ingredients…