Description

4-Methylphthalic Anhydride is a versatile organic intermediate of significant commercial importance in advanced chemical synthesis. Its reactive anhydride functionality makes it a critical building block for creating high-performance polymers, resins, and specialty fine chemicals. This compound is essential for manufacturers and R&D teams in the pharmaceutical, agrochemical, and polymer industries seeking to develop novel compounds with tailored properties.

Application

• Polymer & Resin Production: A key monomer for synthesizing polyimide precursors, alkyd resins, and other high-temperature, high-strength polymers.
• Pharmaceutical Intermediates: Used in the synthesis of active pharmaceutical ingredients (APIs) and complex drug molecules.
• Agrochemical Synthesis: Serves as a building block for herbicides, fungicides, and plant growth regulators.
• Dye & Pigment Manufacturing: Employed in the production of advanced colorants and optical brighteners.
• Epoxy Curing Agents & Modifiers: Acts as a hardener or modifier to enhance the thermal and mechanical properties of epoxy systems.
• Fine Chemical & Specialty Additives: Used in the manufacture of plasticizers, corrosion inhibitors, and other performance additives.

Basic Information

Product Name	4-Methylphthalic Anhydride
CAS No.	19438-61-0
Molecular Formula	C9H6O3
Molecular Weight	162.14 g/mol
Synonyms	4-Methylphthalic anhydride; 4-Methyl-1,3-isobenzofurandione; 1,3-Isobenzofurandione, 4-methyl-; 4-Methylphthalic acid anhydride; 4-Methyl-1,2-benzenedicarboxylic anhydride; 4-Methylphthalic acid cyclic anhydride; 4-Methylphthalic anhydride (6CI,7CI,8CI); 4-Methylphthalic Anhydride (contains up to 15% 3-Methylphthalic Anhydride)
EINECS	243-091-2

Quality Control

Our 4-Methylphthalic Anhydride is manufactured under a strict quality management system to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including assay, identification, and impurity profile analysis. Certificates of Analysis (COA) documenting all test results are available upon request to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and must be kept under dry conditions to prevent hydrolysis. Keep away from strong bases, strong oxidizing agents, and sources of ignition.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	Contact for details
Loss on Drying	≤ 0.5%
Related Substances (HPLC)	Contact for details

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.