Description

3,3'-Dimethyl-4,4'-Biphenylene Diisocyanate is a specialized aromatic diisocyanate monomer, a key building block in polymer chemistry. Its value lies in its rigid, asymmetrical biphenyl core, which imparts enhanced thermal stability and mechanical properties to the resulting polyurethane and polyurea materials. This compound is essential for manufacturers in the coatings, adhesives, sealants, and elastomers (CASE) industries, as well as for advanced material research requiring high-performance polymers.

Application

• High-Performance Polyurethane Elastomers: Used as a chain extender or crosslinker to produce materials with superior heat resistance, toughness, and chemical stability for industrial parts and components.
• Specialty Coatings and Adhesives: A critical raw material for formulating advanced polyurethane coatings, sealants, and adhesives that require excellent durability, weatherability, and adhesion to challenging substrates.
• 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): Employed in the synthesis of high-modulus TPUs for applications in automotive, wire and cable, and technical films.
• Advanced Composite Materials: Used in the production of fiber-reinforced composites and resin systems for the aerospace and automotive sectors.
• Chemical Synthesis Intermediate: Acts as a versatile precursor for the synthesis of other specialty chemicals, including ureas, carbamates, and other heterocyclic compounds.

Basic Information

Product Name	3,3'-Dimethyl-4,4'-Biphenylene Diisocyanate
CAS No.	91-97-4
Molecular Formula	C₁₆H₁₀N₂O₂
Molecular Weight	262.26 g/mol
Synonyms	3,3'-Dimethylbenzidine Diisocyanate; 3,3'-Dimethyl-4,4'-diphenyl diisocyanate; 4,4'-Diisocyanato-3,3'-dimethylbiphenyl; Tolidine Diisocyanate; DMTDI (Dimethyl Tolidine Diisocyanate); BITD (Benzidine-based Isocyanate); 3,3'-Dimethyl-[1,1'-biphenyl]-4,4'-diyl diisocyanate
EINECS	202-112-7

Quality Control

Our production of 3,3'-Dimethyl-4,4'-Biphenylene Diisocyanate adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including assay, isocyanate content, and impurity profile analysis, to ensure consistency and high purity. Certificates of Analysis (COA) documenting all critical parameters are provided and available upon request to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area. Due to its moisture-sensitive (hygroscopic) nature, the container must be kept tightly sealed under a dry inert atmosphere (e.g., nitrogen or argon) to prevent reaction with atmospheric moisture. Recommended storage temperature is 2-8°C for long-term stability. Keep away from heat, open flames, and incompatible materials such as alcohols, amines, and water.

Specification

Item	Specification
Appearance	White to pale yellow crystalline powder
Identification (IR)	Conforms
Assay (NCO Content)	≥ 98.0 %
Purity (HPLC)	≥ 99.0 %
Melting Point	Contact for details
Hydrolyzable Chloride	≤ 0.01 %
Heavy Metals (as Pb)	≤ 10 ppm

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