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Phthalic Anhydride


Phthalic Anhydride is a key aromatic intermediate widely used in the manufacture of plasticizers, unsaturated polyester resins, alkyd resins, and a range of specialty chemicals.

CAS # 85-44-9

Phthalic Anhydride is a high-volume aromatic anhydride widely used as a core intermediate in the production of plasticizers, polyester resins, alkyd resins, and a variety of specialty chemical products. Known for its consistent reactivity, excellent compatibility, and scalable availability, Phthalic Anhydride plays a critical role in improving flexibility, durability, and performance across multiple manufacturing sectors.

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General Properties

 

  • Molecular Formula: C₈H₄O₃

  • Appearance: White crystalline flakes or solid

  • Melting Point: ~131°C

  • Solubility: Reacts with water; soluble in many organic solvents

 

Applications

 

  • Plasticizers

    • A primary raw material for producing phthalate and non-phthalate plasticizers that enhance flexibility and workability in PVC and other polymers.

  • Polyester Resins

    • Used extensively in fiberglass-reinforced plastics, construction panels, marine components, and automotive composites.

  • Specialty Chemicals & Intermediates

    • Serves as a building block for dyes, pigments, pharmaceuticals, agricultural chemicals, and specialty additives.

  • Adhesives & Sealants

    • Improves performance characteristics such as adhesion, flexibility, and longevity.

 

Advantages

 

  • High Reactivity & Efficiency: Facilitates efficient esterification and condensation reactions, supporting high yields and consistent product quality.

  • Versatile Industrial Intermediate: Used across plastics, resins, coatings, and specialty chemical manufacturing, reducing sourcing complexity.

  • Enhances Material Performance: Contributes to improved flexibility, durability, thermal stability, and surface finish in end-use products.

  • Reliable, Large-Scale Availability: Produced globally at industrial scale, ensuring supply continuity for high-volume manufacturing.

  • Cost-Effective Solution: Offers excellent performance-to-cost value for a wide range of applications.

 

Safety & Handling

 

Phthalic Anhydride should be handled using standard industrial chemical safety practices.

 

  • May cause irritation to eyes, skin, and respiratory tract

  • Dust can be irritating if inhaled

  • Avoid prolonged exposure

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