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4,4'-Oxydiphthalic anhydride (ODPA, CAS 1823-59-2) is an aromatic ether-linked dianhydride
widely used as a monomer in the synthesis of high-performance polyimides, epoxy resins,
and advanced polymer systems. The ether linkage within its molecular structure provides
improved chain flexibility and processability while maintaining excellent thermal stability,
chemical resistance, mechanical strength, and electrical insulation properties.
Basic Information of ODPA
| Product Name | 4,4'-Oxydiphthalic anhydride |
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| Abbreviation | ODPA |
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| CAS Number | 1823-59-2 |
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| Molecular Formula | C16H6O7 |
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| Molecular Weight | 310.21 g/mol |
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| Appearance | White to light yellow to light orange powder or crystal |
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| Purity | ≥99.5% |
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| Package | 1kg/bottle, 20kg/drum, or customized |
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| Molecular Structure |  |
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Key Properties
Ether-linked aromatic structure provides an optimal balance between thermal stability
and molecular flexibility
Improved solubility and processability of polyimide precursors compared with fully rigid dianhydrides
Excellent chemical resistance and electrical insulation performance in cured polymer systems
Suitable for applications requiring mechanical durability, dimensional stability,
and reliable performance at elevated temperatures
Key Applications of ODPA
Flexible Films, Coatings, and Adhesives (Primary Application):
ODPA is widely used in flexible polyimide films, coatings, and high-performance adhesive systems,
where enhanced chain flexibility, adhesion, and processing latitude are critical.
ODPA-based polyimides are commonly applied in flexible films, coatings, and adhesive systems
for electronics, industrial insulation, and advanced functional materials.
Composites and Structural Materials:
Incorporated into high-performance composites, foams, molded parts, and films
requiring durability, dimensional stability, and long-term heat resistance.
Adhesives and Epoxy Resin Systems:
Used as a functional component in epoxy resins (including bisphenol A and novolac types),
polyamide resins, and specialty adhesives for electrical insulation and structural bonding.
Detailed COA / TDS / MSDS are available upon request.
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