Description

Benzene, 2,4-Diisocyanato-1-Methyl-, Polymer With 1,6-Diisocyanatohexane CAS NO 26426-91-5 is a specialized aliphatic-aromatic polyisocyanate prepolymer, a key building block in high-performance polyurethane chemistry. This compound matters for its ability to impart a unique balance of chemical resistance, mechanical strength, and weatherability to final polymer products. It is essential for formulators and manufacturers in the coatings, adhesives, sealants, and elastomers (CASE) industries seeking to develop durable, high-quality materials.

Application

• High-Performance Coatings: As a crosslinker in automotive clear coats, industrial maintenance paints, and marine coatings requiring excellent gloss retention and resistance to yellowing, chemicals, and abrasion.
• Elastomers and Sealants: Used in the production of cast elastomers, gaskets, and flexible sealants that demand superior tensile strength, tear resistance, and dynamic performance.
• Adhesives and Binders: Serves as a critical component in structural adhesives for automotive and aerospace composites, as well as in binders for specialty textiles and nonwovens.
• Waterborne Polyurethane Dispersions (PUDs): Employed as a modifying agent or crosslinker to enhance the mechanical properties and water resistance of environmentally friendly PUDs for leather finishing and textile coatings.
• Fiber Optic Coatings: Utilized in formulations for primary and secondary coatings on optical fibers, providing essential protection and signal integrity.

Basic Information

Item	Detail
Product Name	Benzene, 2,4-Diisocyanato-1-Methyl-, Polymer With 1,6-Diisocyanatohexane
CAS No.	26426-91-5
Molecular Formula	Polymeric Mixture (C9H6N2O2 · C8H12N2O2)n
Molecular Weight	Varies by degree of polymerization
Synonyms	Poly(TDI-HDI); TDI/HDI Prepolymer; Toluene Diisocyanate/Hexamethylene Diisocyanate Copolymer; Aliphatic-Aromatic Polyisocyanate; Isocyanic acid, polymethylenepolyphenylene ester, polymer with 1,6-diisocyanatohexane; HDI-TDI copolymer; Modified polyisocyanate based on TDI and HDI; Desmodur® HL (related trade product)
EINECS	Contact for details

Quality Control

Our production of this polyisocyanate prepolymer adheres to strict batch-to-batch consistency protocols. Quality is verified through parameters including NCO content, viscosity, color, and monomer content, ensuring it meets the precise requirements of downstream formulations. A comprehensive Certificate of Analysis (COA) detailing all relevant specifications is provided with every shipment.

Storage

Preserve in a tightly closed, moisture-proof container under a dry, inert atmosphere (e.g., nitrogen blanket), protected from light. Store in a cool, well-ventilated area at temperatures recommended for the specific grade (typically between 15°C and 25°C). This product is hygroscopic (moisture-sensitive) and highly volatile; avoid exposure to moisture, heat, and open flames.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
NCO Content	Contact for details
Viscosity (25°C)	Contact for details
Color (Gardner)	≤ 2
Monomer Content (TDI/HDI)	< 0.5%
Specific Gravity (25°C)	~1.15
Flash Point	> 100 °C

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