Description

Toluene Diisocyanate Dimer is a blocked or latent form of toluene diisocyanate (TDI), characterized by its dimeric structure which provides controlled reactivity. This compound is crucial for industrial applications requiring delayed isocyanate functionality, offering enhanced processing safety and stability. It is primarily utilized by manufacturers in the polyurethane, coatings, and specialty adhesive sectors seeking precise cross-linking agents.

Application

• Polyurethane Systems: Acts as a latent cross-linking agent in one-component (1K) polyurethane coatings, adhesives, and elastomers, curing upon exposure to heat.
• Powder Coatings: Serves as a blocked isocyanate cross-linker in thermosetting powder coatings, providing excellent weather resistance and mechanical properties.
• Adhesives & Sealants: Used in high-performance formulations where controlled cure profiles and improved pot life are required.
• Automotive & Industrial Coatings: A key component in primers and topcoats that demand durability, chemical resistance, and controlled reactivity.
• Elastomer Modification: Employed to modify the properties of rubber and other elastomers, enhancing cross-link density and thermal stability.
• Textile & Leather Finishing: Utilized in coatings and finishes to impart water repellency, abrasion resistance, and flexibility.

Basic Information

Product Name	Toluene Diisocyanate Dimer
CAS No.	9019-84-5
Molecular Formula	C16H12N4O4
Molecular Weight	324.29 g/mol
Synonyms	TDI Dimer; Dimeric Toluene Diisocyanate; Toluene-2,4-diisocyanate Dimer; Uretdione of TDI; Blocked TDI Dimer; Desmodur TT; Isocyanurate precursor; Latent Isocyanate Crosslinker
EINECS	Contact for details

Quality Control

Our Toluene Diisocyanate Dimer is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure consistency, purity, and performance. Certificates of Analysis (COA) detailing key parameters such as assay, NCO content, and free monomer levels are provided and available upon request to support your quality assurance protocols.

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) and must be protected from atmospheric moisture to prevent premature reaction and degradation. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	White to pale yellow powder or flakes
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0%
Free TDI Monomer	≤ 0.5%
Uretdione Content	≥ 90.0%
Melting Point	155 - 165 °C
Moisture (KF)	≤ 0.1%

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