Description

2,3,5,6-Tetrahydro-2-Methylphthalic Anhydride is a specialized cyclic anhydride derivative with significant utility as a versatile chemical intermediate. Its reactive anhydride group makes it a valuable building block for synthesizing advanced polymers, resins, and fine chemicals. This product is essential for manufacturers and R&D teams in the polymer, coatings, and specialty chemical industries seeking to develop materials with tailored properties.

Application

• Polymer & Resin Synthesis: A key monomer for producing alkyd, polyester, and epoxy resins, contributing to hardness and chemical resistance in final coatings and composites.
• Curing Agent for Epoxies: Functions as a latent or co-curing agent in epoxy resin systems, influencing cure kinetics and thermal properties.
• Plasticizer & Modifier Intermediate: Used in the synthesis of plasticizers and modifiers to enhance the flexibility and processing of polymers like PVC.
• Fine Chemical & Pharmaceutical Intermediates: Serves as a precursor in the multi-step synthesis of complex organic molecules and active pharmaceutical ingredients (APIs).
• Adhesive & Sealant Formulations: Incorporated to improve adhesion, cohesion, and environmental stability in high-performance adhesive systems.
• Research & Development: A valuable reagent in academic and industrial R&D for exploring new polymeric materials and organic synthesis pathways.

Basic Information

Product Name	2,3,5,6-Tetrahydro-2-Methylphthalic Anhydride
CAS No.	42498-58-8
Molecular Formula	C9H10O3
Molecular Weight	166.17 g/mol
Synonyms	2-Methyl-1,3-cyclohexanedicarboxylic anhydride; 2-Methylhexahydrophthalic anhydride; 2-Methyl-δ4-tetrahydrophthalic anhydride; 2-Methyl-4-cyclohexene-1,2-dicarboxylic anhydride; MTHPA (common abbreviation); 2-Methyl-3a,4,7,7a-tetrahydro-1H-isoindole-1,3(2H)-dione (alternative IUPAC); 2-Methyltetrahydrophthalic anhydride (general term).
EINECS	Contact for details

Quality Control

Our 2,3,5,6-Tetrahydro-2-Methylphthalic Anhydride is manufactured under a stringent quality management system. Every batch undergoes rigorous analytical testing to ensure high purity, consistency, and compliance with agreed specifications. A comprehensive Certificate of Analysis (COA), detailing parameters such as assay, acidity, and moisture content, is provided with each shipment to guarantee traceability and support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive). Keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect product quality and reactivity.

Specification

Item	Specification
Appearance	White to off-white crystalline solid
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Melting Point	60 - 70 °C
Acidity (as phthalic acid)	≤ 1.0%
Water Content (KF)	≤ 0.5%

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