Description

4,4'-Oxybis(Phenyl Isocyanate) is a high-purity aromatic diisocyanate monomer, a key building block in advanced polymer synthesis. Its bifunctional nature and rigid aromatic structure make it essential for creating polyurethane and polyurea materials with enhanced thermal stability, chemical resistance, and mechanical properties. This compound is critical for manufacturers in the coatings, adhesives, sealants, and elastomers (CASE) industries, as well as for researchers developing high-performance specialty polymers.

Application

• High-Performance Polyurethane Elastomers: Used as a chain extender or crosslinker to produce elastomers with superior heat resistance and durability for industrial parts, rollers, and gaskets.
• Specialty Coatings and Adhesives: A key raw material in formulating advanced two-component polyurethane coatings, adhesives, and sealants that require excellent weatherability and chemical resistance.
• Polyurea Spray Systems: Serves as a reactive component in fast-curing polyurea formulations for protective linings, truck bed liners, and waterproofing membranes.
• Thermoplastic Polyurethanes (TPU): Incorporated to enhance the thermal and mechanical properties of TPUs used in wire & cable, film, and tubing applications.
• Polyimide and Polyamide Synthesis: Used as a monomer in the synthesis of high-temperature resistant polymers like polyimides for aerospace and electronics.
• Crosslinking Agent for Resins: Functions as an effective crosslinker for hydroxyl- or amine-functional resins, improving their hardness and solvent resistance.

Basic Information

Product Name	4,4'-Oxybis(Phenyl Isocyanate)
CAS No.	4128-73-8
Molecular Formula	C14H8N2O3
Molecular Weight	252.23 g/mol
Synonyms	4,4'-Diphenylmethane Diisocyanate, Oxy Analogue; Bis(4-isocyanatophenyl) Ether; DADI (Dianisidine Diisocyanate analogue); 1,1'-Oxybis[4-isocyanatobenzene]; 4,4'-ODI; Isocyanic Acid, Bis(4-isocyanatophenyl) Ester; 4,4'-Diisocyanatodiphenyl Ether
EINECS	223-941-0

Quality Control

Our 4,4'-Oxybis(Phenyl Isocyanate) is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including assay, purity profiling, and isocyanate content determination, to ensure it meets precise specifications for polymer-grade applications. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and consistency for your production processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at temperatures between 15°C and 25°C (59°F and 77°F). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed under a dry inert atmosphere (e.g., nitrogen or argon) to prevent reaction with atmospheric moisture. Keep away from heat, sparks, open flames, and incompatible materials such as alcohols, amines, and strong bases.

Specification

Item	Specification
Appearance	White to pale yellow crystalline solid
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.5 %
Isocyanate Content (NCO)	32.0 - 33.5 %
Melting Point	95 - 105 °C
Hydrolyzable Chloride	≤ 0.05 %
Total Chlorine	≤ 0.1 %
Moisture (Karl Fischer)	≤ 0.1 %

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