Description

3,3'-Dichlorodiphenyl 4,4'-Diisocyanate is a specialized aromatic diisocyanate monomer characterized by its chlorinated benzene rings. This compound matters as a key building block for synthesizing high-performance polyurethane and polyurea polymers with enhanced chemical resistance and thermal stability. It is primarily needed by manufacturers in the coatings, adhesives, sealants, and elastomers (CASE) industries, as well as for advanced material research.

Application

• High-Performance Polyurethane Coatings: Used to formulate industrial and marine coatings requiring exceptional durability, chemical resistance, and weatherability.
• Specialty Adhesives & Sealants: Serves as a core component in adhesives for demanding environments, such as in aerospace or automotive assembly.
• Elastomer Production: A critical monomer for manufacturing polyurethane elastomers with superior mechanical properties for gaskets, rollers, and technical parts.
• Polyurea Spray Coatings: Employed in fast-curing polyurea formulations for protective linings in tanks, pipes, and secondary containment.
• Cross-linking Agent: Acts as an effective cross-linker for polymers and resins to enhance hardness, tensile strength, and solvent resistance.
• Chemical Intermediate: Utilized in organic synthesis for pharmaceuticals, agrochemicals, and other fine chemicals requiring a dichlorinated diisocyanate moiety.

Basic Information

Product Name	3,3'-Dichlorodiphenyl 4,4'-Diisocyanate
CAS No.	5331-87-3
Molecular Formula	C14H6Cl2N2O2
Molecular Weight	305.11 g/mol
Synonyms	3,3'-Dichloro-4,4'-diisocyanatodiphenyl; 4,4'-Diisocyanato-3,3'-dichlorobiphenyl; DCDI; 3,3'-Dichlorobiphenyl-4,4'-diisocyanate; 3,3'-Dichloro-4,4'-diisocyanatobiphenyl; Bis(4-isocyanato-2-chlorophenyl)methane (common misnomer); 3,3'-Dichlorodiphenylmethane-4,4'-diisocyanate (common misnomer); Isonate® 143L (potential trade name variant)
EINECS	226-235-5

Quality Control

Our 3,3'-Dichlorodiphenyl 4,4'-Diisocyanate undergoes rigorous quality testing to ensure batch-to-batch consistency and compliance with industry standards. Production follows strict protocols, and comprehensive Certificates of Analysis (COA) documenting purity, isocyanate content, and impurity profiles are available upon request.

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 material is hygroscopic (moisture-sensitive); containers must be kept tightly sealed under a dry inert atmosphere (e.g., nitrogen) to prevent reaction with atmospheric moisture.

Specification

Item	Specification
Appearance	White to pale yellow crystalline solid
Identification (IR)	Conforms
Assay (NCO Content)	≥ 98.0 %
Purity (HPLC)	≥ 97.0 %
Hydrolyzable Chlorine	≤ 0.1 %
Melting Point	95 - 105 °C

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