What is 4,4′-Methylenebis(2-ethyl-6-methylaniline) (MMEA)?

4,4′-Methylenebis(2-ethyl-6-methylaniline), commonly known as MMEA (CAS 19900-72-2), is a hindered aromatic diamine used as a chemical intermediate and high-performance curing agent. Its molecular formula is C19H26N2 with a molecular weight of 282.42 g/mol. MMEA is widely applied in the synthesis of polyurethane elastomers, polyurea resins, epoxy resins, polyimides, and maleimides.

What is the CAS number of MMEA?

The CAS Registry Number for 4,4′-Methylenebis(2-ethyl-6-methylaniline) is 19900-72-2. It is also sold under trade names such as CUREHARD-MED and is recognized by synonyms including 4,4′-DIAMINO-3,3′-DIETHYL-5,5′-DIMETHYLDIPHENYLMETHANE and BIS(4-AMINO-3-ETHYL-5-METHYLPHENYL)METHANE.

What are the physical and chemical properties of MMEA (CAS 19900-72-2)?

Key physical and chemical properties of MMEA include: Molecular Formula: C19H26N2; Molecular Weight: 282.42 g/mol; Density: 1.039 g/cm³; Melting Point: 85 °C; Boiling Point: 443.1 °C at 760 mmHg; Flash Point: 266 °C; Purity: >98.0%.

What are the main applications of MMEA?

MMEA (CAS 19900-72-2) serves several high-performance industrial applications: (1) Polyurethane Elastomers — used as a chain extender and curing agent in cast polyurethane (CPU), thermoplastic polyurethane (TPU), reaction injection molding (RIM), and spray polyurea systems to significantly improve mechanical properties. (2) Epoxy Curing Agent — imparts exceptional thermal stability, making it ideal for high-temperature applications such as aerospace composites and structural adhesives. (3) Polyurea Resins — enables rapid curing with exceptional toughness for protective coatings, linings, and sealants. (4) Specialty Precursor — serves as a raw material for polyimides and maleimides, providing superior aging resistance in demanding environments.

How does MMEA compare to other aromatic diamine curatives?

MMEA is classified as a hindered aromatic diamine, meaning its amine groups are sterically hindered by adjacent ethyl and methyl substituents on the aromatic ring. This steric hindrance slows the reactivity compared to unhindered diamines such as MOCA, which gives formulators a longer pot life and more controlled processing window. At the same time, MMEA-cured systems exhibit exceptional thermal stability and superior aging resistance, making it a preferred curative for aerospace composites and other high-performance applications.

What is the recommended storage and handling for MMEA?

MMEA should be stored in a cool, dry, and well-ventilated area, away from heat sources and incompatible materials such as strong oxidizers and acids. The material has a melting point of 85 °C and a high flash point of 266 °C. Appropriate personal protective equipment (PPE) including gloves, safety goggles, and respiratory protection should be used during handling. Always consult the product's Safety Data Sheet (SDS) for detailed handling, storage, and disposal guidelines.

What purity grade of MMEA does Symb ChemTech supply?

Symb ChemTech supplies MMEA at a purity of greater than 98.0%, produced under strict quality control measures to ensure consistent performance batch after batch. Technical support from an experienced team of chemists is also available to assist with application-specific requirements.

symb | July 21, 2009 | 12:46 pm

Product Name: 4,4′-Methylene-bis(2-methyl-6-ethylaniline)

Synonyms: 4,4′-DIAMINO-3,3′-DIETHYL-5,5′-DIMETHYLDIPHENYLMETHANE; 4,4′-METHYLENEBIS(2-ETHYL-6-METHYLANILINE); METHYLENEBIS(2-ETHYL-6-METHYLANILINE); CUREHARD-MED; BIS(4-AMINO-3-ETHYL-5-METHYLPHENYL)METHANE; di-(3-Methyl-4-amino-6-etyhyl)phenylmethane; 4,4′-methanediylbis(2-ethyl-6-methylaniline); 4,4-methylenebis(2-methyl-6-ethylaniline)
CAS RN.: 19900-72-2

Molecular Weight: 282.4231
Molecular Formula: C19H26N2
Density: 1.039g/cm3
Melting Point(℃): 85 °C
Boiling Point(℃): 443.1°C at 760 mmHg
Flash Point(℃): 266°C

Purity: >98.0%

Application: Polyurethane Elastomer, Polyurea Resin Curing Agent And Epoxy Curing Agent.

4,4′-Methylenebis(2-ethyl-6-methylaniline) (MMEA), also known as CAS 19900-72-2, is a crucial chemical intermediate used in the production of various industrial products. It is particularly valued for its role as a curing agent in the synthesis of polyurethane elastomers, polyurea resins, and epoxy resins.

Why Choose Symb ChemTech for MMEA?

Symb ChemTech is a renowned manufacturer of high-quality MMEA. Our commitment to quality, reliability, and customer satisfaction has made us a preferred supplier for numerous industries worldwide.

Key Features of Our MMEA:

Purity: Our MMEA is produced to the highest purity standards, ensuring optimal performance in your applications.
Consistency: We maintain strict quality control measures to deliver consistent product quality batch after batch.
Competitive Pricing: Our efficient manufacturing processes allow us to offer competitive pricing without compromising on quality.
Technical Support: Our experienced team of chemists is available to provide technical support and answer your questions.

Applications of MMEA:

Polyurethane Elastomers: MMEA is used to cure polyurethane elastomers, which are known for their excellent mechanical properties, durability, and resistance to abrasion, oil, and chemicals.
Polyurea Resins: MMEA is employed in the formulation of polyurea resins, which are used in protective coatings, linings, and sealants due to their rapid curing speed and exceptional toughness.
Epoxy Resins: MMEA can be used as a curing agent for epoxy resins, which are widely used in adhesives, coatings, and composites.

Contact Us Today

To learn more about our MMEA product, pricing, and availability, please contact us. Our dedicated sales team is ready to assist you with your specific requirements.

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Tags:

CAS Number	19900-72-2
Molecular Formula	C₁₉H₂₆N₂
Molecular Weight	282.42 g/mol
Appearance	White to pale yellow powder
Melting Point	83.5-87.5°C
Boiling Point	443.1°C at 760 mmHg
Solubility	Soluble in organic solvents

4,4′-Methylenebis(2-ethyl-6-methylaniline) [19900-72-2] (MMEA)

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