Sodium Cocoyl Isethionate
Time: 2012-09-28 16:40:04
Sodium Cocoyl Isethionate
Synonyms
Fatty acids, coconut oil, sulfoethyl esters, sodium salts;
Coconut fatty acid, 2-sulfoethyl ester, sodium salt;
SCI;
Category
Anionic Surfactant
>> Sulfonate
>> Ester Sulfonate
>> Fatty Acyl Hydroxyalkyl Sulfonate
>> Fatty Acid (Natural Substance Derivative) Acyl Hydroxyalkyl Sulfonate
Chemical Numbering System
CASRN61789-32-0
EINECS263-052-5
Molecular Formula & Molecular Weight
Molecular Formula: N/A
Molecular Weight: N/A
Structure
R: coco structure.
Properties
Appearance    (1), white or beige paste; (2), white or beige powder or flaky solid.
Odor    faint grease odor.
Solubility    soluble in water.
Stability    stable in weak acid, weak alkali, hard water. Under strong acid or strong alkali, easily hydrolyze.
Risk    Solid form: flammable material; irritation, low irritation to skin, eye. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.
GHS (Rev.6) label:  
Animal Toxicity
Table 1 Animal toxicity values
rat oral LD50
4330mg/kg[1]
Ecology    may be hazardous to environment. Water body should be given special attention.
Biodegradability    biodegradable.
Characteristics    excellent cleansing, foaming, emulsifying, dispersing, wetting, solubilizing abilities. Mild. Easily thickening. Can be used in sulfate-free formula. Suitable for neutral formula system.
Note    (1), Can use in children products, such as shampoo, bath liquid and so on.
Synthesis
Sodium hydroxyethanesulfonate reacts with coconut acid, then obtain.
For further information, see:
United States Patent 8,008,239 Acylalkylisethionate esters and applications in consumer products,
United States Patent 8,105,993 Process compositions and production of acyl alkylisethionate compositions,
United States Patent 8,580,723 Process compositions and production of acyl alkylisethionate compositions,
United States Patent 9,598,358 Acylalkylisethionate esters and applications in consumer products, and so on.
Quality Standards & Test Methods
1. Physical and chemical indexes
Item
Physical and chemical indexes
Solid
Paste
Actives, %, ≥
80.0 - 85.0
50.0 - 60.0
pH (25°C, 10%)
5.0 - 8.0
5.0 - 8.0
Test Methods
(1), Actives
GB/T 5173 Surface active agents and detergents-Determination of anionic-active matter by direct two-phase titration procedure
ISO 2271 Surface active agents -- Detergents -- Determination of anionic-active matter by manual or mechanical direct two-phase titration procedure
(2), pH
GB/T 6368 Surface active agents - Determination of pH of aqueous solution - Potentiometric method
ISO 4316 Surface active agents -- Determination of pH of aqueous solutions -- Potentiometric method
2. Hazardous substances indexes
Item
Hazardous substances indexes
Solid
Heavy metals (as Pb), mg/Kg, ≤
20
As, mg/Kg, ≤
3
Test Methods
(1), Heavy metals (as Pb)
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30799 The test method of food detergents - Determination of heavy metals
(2), As
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30797 The test method of food detergents - Determination of total arsenic
3. Further explanation
(a), On physical and chemical indexes: firstly, shall be indicated carbon atom distribution; secondly, shall be indicated average molecular weight.
(b), Used in cosmetics, should be test for harmful substances; or furtherly test for microorganisms.
Major Uses
1. Typical Applications
Use as cleansing agent.
Use as foaming agent.
Use as emulsifying agent, dispersing agent.
2. Personal care products
Use as cleansing agent, foaming agent.
Characteristics: mild, rich foam, smooth skin feeling after washing.
Manufacturers
 
References
[1]: ChemIDplus. 61789-32-0, Sodium cocoyl isothionate
Update: 20131028(1); 20170814(2);