Methacrylic acid
Synonyms
2-Propenoic acid, 2-methyl-;
Category
Anionic Surfactant
> Carboxylate
>> Chain Carboxylate
>>> Alkenyl Carboxylate
>>>> Branched Alkenyl Carboxylate
Chemical Numbering System
CAS: 79-41-4
EINECS: 201-204-4
Molecular Formula & Molecular Weight
Molecular Formula: C4H6O2
Molecular Weight: 86.09
Structure
Properties
Appearance (1), liquid; low temperature: solid.
Solubility soluble in water.
Stability stable. Easily oxidized.
Risk Liquid form: flammable material; irritation, irritation to skin, eye, respiratory system. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.
GHS label: 
Animal Toxicity
Table 1 Animal toxicity values
|
guinea pig skin LD50 |
1000mg/kg[1] |
|
mouse intraperitoneal LD50 |
48mg/kg[1] |
|
mouse oral LD50 |
1250mg/kg[1] |
|
rabbit oral LD50 |
1200mg/kg[1] |
|
rabbit skin LD50 |
500mg/kg[1] |
|
rat oral LD50 |
1060mg/kg[1] |
Human Toxicity
Table 2 Human toxicity values
|
child oral TDLo |
0.25mL/kg[1] |
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent film-forming, dispersing abilities.
Synthesis
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Liquid |
|
|
Actives, %, ≥ |
95.0 |
Test Methods
(1), Actives
GB/T 13173 Surface active agents -- Detergents -- Testing methods
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Liquid |
|
|
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, according to local regulations and standards.
Major Uses
1, Typical applications
Use as monomer.
2, Personal care products
Film-forming agent in personal care products.
Manufacturers
References
[1]: ChemIDplus. 79-41-4, Methacrylic acid
Update: 20140309(1); 20180909(2);