Description

1,3-Propanediol, 2-ethyl-2-(hydroxymethyl)-, polymer with 1,3-diisocyanatomethylbenzene, 2-ethyl-1-hexanol-blocked 1,3-Propanediol,2-ethyl-2-(hydroxymethyl)-,polymer with 1,3-diisocyanatomethylbenzene,2-ethyl-1-hexanol-blocked CAS NO 67873-84-1 is a specialized blocked polyurethane prepolymer derived from trimethylolpropane (TMP) and meta-tetramethylxylene diisocyanate (m-TMXDI). This product is engineered to provide a stable, one-component system that cures upon exposure to heat, releasing the blocking agent and forming a durable polyurethane network. It is a critical raw material for formulators seeking to develop high-performance, solvent-free coatings, adhesives, sealants, and elastomers (CASE) with excellent weatherability, chemical resistance, and mechanical properties.

Application

• High-Performance Industrial Coatings: Used as a crosslinker in heat-cured powder coatings and liquid coatings for automotive, appliance, and general metal finishing, offering excellent flow and durability.
• Adhesives and Sealants: Serves as a key component in formulating reactive hot-melt adhesives (HMPUR) and structural sealants that require high strength and environmental resistance.
• Elastomers and Castables: Employed in the production of cast polyurethane elastomers for industrial rollers, wheels, and impact-absorbing components.
• Wire and Cable Insulation: Used in coatings and jacketing materials that demand superior electrical properties and thermal stability.
• Textile and Leather Finishes: Imparts durable, flexible, and water-resistant finishes to technical textiles and synthetic leather.
• Composite Materials: Acts as a matrix resin or modifier in fiber-reinforced composites, enhancing interlaminar adhesion and toughness.

Basic Information

Product Name	1,3-Propanediol, 2-ethyl-2-(hydroxymethyl)-, polymer with 1,3-diisocyanatomethylbenzene, 2-ethyl-1-hexanol-blocked
CAS No.	67873-84-1
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	m-TMXDI adduct with Trimethylolpropane, blocked with 2-Ethylhexanol; Blocked polyisocyanate based on TMP and m-TMXDI; 2-Ethyl-2-(hydroxymethyl)-1,3-propanediol polymer with 1,3-diisocyanatomethylbenzene, 2-ethylhexanol-blocked; TMP-m-TMXDI prepolymer, 2-EH blocked; Blocked aliphatic polyisocyanate crosslinker; Meta-tetramethylxylene diisocyanate trimethylolpropane adduct, 2-ethylhexanol blocked; Urethane prepolymer, blocked (TMP/m-TMXDI/2-EH)
EINECS	Contact for details

Quality Control

Our production of this blocked polyisocyanate adheres to stringent quality management protocols. Every batch is analyzed to ensure consistent NCO content, viscosity, blocking agent content, and color. A comprehensive Certificate of Analysis (COA) detailing these parameters is provided with each shipment to guarantee it meets your formulation specifications and supports your own quality assurance processes.

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 / 59-77°F). This product is hygroscopic (moisture-sensitive). Keep container tightly sealed when not in use to prevent moisture absorption, which can lead to premature reaction and gelation. Keep away from heat and open flame.

Specification

Item	Specification
Appearance	Clear, viscous liquid
Color (Gardner)	≤ 3
Viscosity @ 25°C	Contact for details
NCO Content (Blocked)	Contact for details
Solid Content	~100%
Blocking Agent (2-Ethylhexanol) Content	Contact for details
De-blocking Temperature	~130 - 150°C

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