Description

4,4'-Diisocyanato-3,3'-Dimethyldiphenylmethane is a specialized aromatic diisocyanate monomer, a key building block in advanced polymer synthesis. Its value lies in its unique molecular structure, which imparts enhanced chemical resistance 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 seeking to develop high-performance, durable products.

Application

• High-Performance Polyurethane Coatings: Used as a curing agent to formulate coatings with excellent weatherability, chemical resistance, and hardness for industrial and automotive applications.
• Specialty Elastomers and Sealants: Serves as a core component in the production of polyurethane and polyurea elastomers, offering superior tensile strength, abrasion resistance, and flexibility.
• Advanced Adhesives: A critical raw material for manufacturing high-strength, structural adhesives used in aerospace, automotive, and construction bonding.
• Thermoset Resins: Employed in the synthesis of cross-linked polymer resins for composite materials, providing enhanced thermal stability and dimensional integrity.
• Chemical Intermediate: Acts as a versatile precursor for further chemical modifications, enabling the creation of custom polymers and specialty chemicals.

Basic Information

Product Name	4,4'-Diisocyanato-3,3'-Dimethyldiphenylmethane
CAS No.	139-25-3
Molecular Formula	C17H14N2O2
Molecular Weight	278.31 g/mol
Synonyms	3,3'-Dimethyl-4,4'-diphenylmethane diisocyanate; 3,3'-Dimethylbenzidine diisocyanate; DMDI; 4,4'-Diisocyanato-3,3'-dimethylbiphenylmethane; Bitmap-Diisocyanate; 1,1'-Methylenebis(4-isocyanato-2-methylbenzene); 4,4'-Methylenebis(2-methylphenyl isocyanate); 3,3'-Dimethyl-4,4'-biphenylene diisocyanate
EINECS	205-355-4

Quality Control

Our production of 4,4'-Diisocyanato-3,3'-Dimethyldiphenylmethane adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including assay, isomer content, and impurity profiling, to ensure consistent purity and performance. A detailed Certificate of Analysis (COA) is provided with each shipment, confirming compliance with agreed specifications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a temperature of 15-25°C. This product is hygroscopic (moisture-sensitive); containers must be kept tightly sealed under a dry inert atmosphere (e.g., nitrogen) to prevent reaction with atmospheric moisture and carbon dioxide, which can lead to polymerization or gel formation.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (HPLC)	≥ 99.0 %
Isomer Content (4,4'-)	≥ 98.0 %
Hydrolyzable Chlorine	≤ 0.01 %
Acidity (as HCl)	≤ 0.01 %
Specific Gravity (25°C)	1.19 - 1.21
Viscosity (25°C)	Contact for details

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