Description

Ureylenebis(p-Phenylenemethylene-p-Phenylene) Diisocyanate CAS NO 93805-48-2 is a specialized aromatic diisocyanate monomer characterized by its unique ureylene-bridged biphenyl structure. This compound is a critical building block in the synthesis of high-performance polyurethanes and polyureas, offering enhanced thermal stability and mechanical properties to the final polymer. It is primarily utilized by manufacturers in the advanced materials sector seeking to develop specialized coatings, adhesives, sealants, and elastomers for demanding industrial applications.

Application

• High-Performance Polyurethane Coatings: Used as a key monomer in formulating advanced industrial, automotive, and marine coatings that require exceptional chemical resistance, durability, and weatherability.
• Specialty Adhesives and Sealants: Serves as a cross-linking agent in the production of high-strength, flexible adhesives and sealants for aerospace, construction, and electronics assembly.
• Engineering Elastomers: A vital component in the synthesis of polyurea and polyurethane elastomers used in mining, oil & gas, and heavy machinery for parts requiring high abrasion resistance.
• Composite Materials: Employed in the resin matrix for fiber-reinforced composites, enhancing interlaminar shear strength and thermal performance.
• Waterborne Polyurethane Dispersions (PUDs): Used to develop environmentally friendly, low-VOC coating and adhesive systems with high performance characteristics.
• Optical and Electronic Materials: Acts as a precursor in the synthesis of polymers for optical lenses, encapsulants, and insulating materials due to its stable aromatic structure.

Basic Information

Product Name	Ureylenebis(p-Phenylenemethylene-p-Phenylene) Diisocyanate
CAS No.	93805-48-2
Molecular Formula	C23H16N4O4
Molecular Weight	412.40 g/mol
Synonyms	1,1'-[Methylenebis(4,1-phenylene)]bis[3-(4-isocyanatophenyl)urea]; Bis(4-isocyanatophenyl) Ureylenebis(methylene-p-phenylene) Derivative; Ureylene Diphenylmethane Diisocyanate Analog; p,p'-Diisocyanatodiphenylmethane Ureylene Derivative; MDI-Ureylene Derivative; Aromatic Ureylene Diisocyanate; 4,4'-Diisocyanato-1,1'-[methylenebis(4,1-phenylene)]diurea (uncommon); Contact for additional trade names.
EINECS	Contact for details

Quality Control

Our Ureylenebis(p-Phenylenemethylene-p-Phenylene) Diisocyanate is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including assay by HPLC, isocyanate content titration, and impurity profiling, to ensure high purity and batch-to-batch consistency critical for polymer synthesis. Certificates of Analysis (COA) documenting all key specifications are provided with every shipment to 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) and must be kept under a dry inert atmosphere (e.g., nitrogen or argon) to prevent reaction with atmospheric moisture and carbon dioxide, which can lead to polymerization or urea formation. Keep away from heat, open flames, and incompatible materials such as alcohols, amines, and water.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or flakes
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Isocyanate Content (Titration)	20.3 - 20.8 % (Theoretical: 20.36%)
Hydrolyzable Chlorine	≤ 100 ppm
Melting Point	Contact for details

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