Description

4,4'-Biphenyldiisocyanate is a high-purity aromatic diisocyanate monomer, a critical building block for advanced polymer synthesis. This compound matters for its ability to impart exceptional thermal stability, mechanical strength, and chemical resistance to the resulting polymeric materials. It is primarily needed by manufacturers in the polyurethane, specialty adhesive, high-performance coating, and advanced material sectors seeking to develop products with superior durability.

Application

• Synthesis of high-performance, thermally stable polyurethane elastomers and coatings.
• Production of specialized adhesives and sealants for demanding industrial applications.
• Key monomer for advanced polyimide and polyurea resins used in aerospace and electronics.
• Manufacturing of liquid crystal polymers (LCPs) and other high-modulus engineering plastics.
• Cross-linking agent for enhancing the properties of epoxy and other thermoset systems.
• Research and development of novel pharmaceutical intermediates and fine chemicals.

Basic Information

Product Name	4,4'-Biphenyldiisocyanate
CAS No.	2761-22-0
Molecular Formula	C14H8N2O2
Molecular Weight	236.23 g/mol
Synonyms	Biphenyl-4,4'-diisocyanate; p,p'-Biphenyl Diisocyanate; 4,4'-Diisocyanatobiphenyl; BDI; DIBP; [1,1'-Biphenyl]-4,4'-diyl diisocyanate; NSC 5111; Biphenylene Diisocyanate
EINECS	220-419-9

Quality Control

Our 4,4'-Biphenyldiisocyanate is produced under stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including assay, purity profiling, and isocyanate content determination, to ensure it meets exacting industry and research specifications. A detailed Certificate of Analysis (COA) is provided with each shipment to guarantee traceability and consistent quality.

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). Due to its moisture-sensitive (hygroscopic) nature, containers must be kept tightly sealed under a dry inert atmosphere (e.g., nitrogen or argon) to prevent hydrolysis and degradation. Isolate from strong bases, acids, alcohols, amines, and other compounds containing active hydrogen.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Isocyanate Content (Titration)	34.5 - 35.5 %
Melting Point	160 - 165 °C
Hydrolyzable Chloride	≤ 0.1 %
Heavy Metals (as Pb)	≤ 10 ppm

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