What is Itaconic Acid CAS 97-65-4?

Itaconic Acid is an unsaturated dicarboxylic acid with the IUPAC name 2-methylidenebutanedioic acid. It has the molecular formula C5H6O4 and a molecular weight of 130.10 g/mol, and it is commonly described as methylenesuccinic acid.

What are the main physical properties of Itaconic Acid?

Itaconic Acid is normally a white crystalline solid or powder. Reported melting points are usually in the range of 162-168 °C, the density is about 1.6 g/cm3, and the first pKa is about 3.85 at 25 °C. It is readily soluble in water and ethanol.

Why is Itaconic Acid used as a functional monomer?

The molecule contains both an exocyclic carbon-carbon double bond and two carboxylic acid groups. This reactive structure allows it to copolymerize with acrylates, methacrylates, acrylonitrile, and other unsaturated monomers, and to introduce carboxyl functionality into resins, latex systems, coatings, and specialty polymers.

What is the difference between Itaconic Acid, citraconic acid, and mesaconic acid?

All three are unsaturated dicarboxylic acid isomers with the same molecular formula, but they differ in the position or geometry of the double bond. Itaconic Acid has a methylene group attached to the carbon bearing one carboxyl group, which gives it different reactivity and makes it especially useful as a co-monomer.

Is Itaconic Acid available as a bio-based chemical?

Yes. Itaconic Acid is produced industrially by fermentation, notably using Aspergillus terreus, and is considered an important bio-based platform chemical. This makes it attractive for renewable polymer and specialty chemical development when the production route and grade are confirmed with the supplier.

What should be confirmed when sourcing industrial-grade Itaconic Acid?

Buyers should confirm purity or assay, appearance, moisture, color, particle or crystalline form, and any application-specific residual or trace requirements. Because polymer performance can be sensitive to impurities, the selected grade should be evaluated against the intended polymerization or synthesis process.

Itaconic Acid CAS 97-65-4

Itaconic Acid, also called methylenesuccinic acid, CAS 97-65-4, is an industrial dicarboxylic acid supplied as a white crystalline solid and positioned as a functional monomer and chemical intermediate for polymer and specialty formulation use. Confirm the required grade, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 97-65-4
Synonyms: Itaconic Acid; Methylenesuccinic Acid; 2-Methylenesuccinic Acid; 2-Methylidenebutanedioic Acid
Einecs: 202-599-6
Molecular Formula: C5H6O4
Grade: Industrial / chemical synthesis grade
Package: Standard export bag or drum packaging

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Product Description

Itaconic Acid CAS 97-65-4 is an unsaturated dicarboxylic acid, with EC 202-599-6 and molecular formula C5H6O4.

Synonyms: Methylenesuccinic Acid; 2-Methylenesuccinic Acid; 2-Methylidenebutanedioic Acid.

CAS: 97-65-4.

Molecular formula: C5H6O4.

It has a molecular weight of about 130.10 g/mol.

It is supplied as a white crystalline solid or powder.

It has a reported melting point around 162-168 C and a density of about 1.6 g/cm3.

It is positioned as a functional monomer and chemical intermediate for polymers, resins, coatings, adhesives, and specialty formulations.

It contains an exocyclic carbon-carbon double bond and two carboxylic acid groups.

It copolymerizes with acrylates, methacrylates, acrylonitrile, and other unsaturated monomers.

It introduces carboxyl functionality into resins, latex systems, coatings, and specialty polymers.

It is produced industrially by fermentation and is considered an important bio-based platform chemical.

Confirm the required grade, purity, appearance, moisture, color, particle or crystalline form, and application-specific trace requirements.

Store in tightly closed containers in a cool, dry, well-ventilated area, away from moisture and direct sunlight.

Use suitable PPE when handling the powder to prevent dust exposure and skin or eye contact.

Confirm packaging suitable for the solid form and order quantity, and follow the current SDS.

Confirm grade, packaging, and specification as required.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended application, required grade, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Itaconic Acid CAS 97-65-4?

A: Itaconic Acid is an unsaturated dicarboxylic acid with the IUPAC name 2-methylidenebutanedioic acid. It has the molecular formula C5H6O4 and a molecular weight of 130.10 g/mol, and it is commonly described as methylenesuccinic acid.
Q:
What are the main physical properties of Itaconic Acid?

A: Itaconic Acid is normally a white crystalline solid or powder. Reported melting points are usually in the range of 162-168 °C, the density is about 1.6 g/cm3, and the first pKa is about 3.85 at 25 °C. It is readily soluble in water and ethanol.
Q:
Why is Itaconic Acid used as a functional monomer?

A: The molecule contains both an exocyclic carbon-carbon double bond and two carboxylic acid groups. This reactive structure allows it to copolymerize with acrylates, methacrylates, acrylonitrile, and other unsaturated monomers, and to introduce carboxyl functionality into resins, latex systems, coatings, and specialty polymers.
Q:
What is the difference between Itaconic Acid, citraconic acid, and mesaconic acid?

A: All three are unsaturated dicarboxylic acid isomers with the same molecular formula, but they differ in the position or geometry of the double bond. Itaconic Acid has a methylene group attached to the carbon bearing one carboxyl group, which gives it different reactivity and makes it especially useful as a co-monomer.
Q:
Is Itaconic Acid available as a bio-based chemical?

A: Yes. Itaconic Acid is produced industrially by fermentation, notably using Aspergillus terreus, and is considered an important bio-based platform chemical. This makes it attractive for renewable polymer and specialty chemical development when the production route and grade are confirmed with the supplier.
Q:
What should be confirmed when sourcing industrial-grade Itaconic Acid?

A: Buyers should confirm purity or assay, appearance, moisture, color, particle or crystalline form, and any application-specific residual or trace requirements. Because polymer performance can be sensitive to impurities, the selected grade should be evaluated against the intended polymerization or synthesis process.

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