Description

1,3-Propanediol, 2-ethyl-2-(hydroxymethyl)-, polymer with 2,4-diisocyanato-1-methylbenzene, α-hydro-ω-hydroxypoly[ oxy(methyl-1,2-ethanediyl)] and 2,2'-oxybis[ethanol], caprolactam-blocked is a specialized, blocked polyurethane prepolymer designed for controlled reactivity in advanced coating and adhesive formulations. This compound matters because its caprolactam blocking agent provides excellent shelf stability, only releasing the reactive isocyanate groups upon heating, which enables precise processing and curing. It is primarily needed by formulators in the automotive, industrial maintenance, and specialty plastics industries seeking to develop high-performance, thermoset polyurethane systems with enhanced pot life and application properties.

Application

• High-Performance Industrial Coatings: As a key resin component in heat-cured powder coatings and coil coatings for automotive parts, appliances, and metal substrates requiring durability and chemical resistance.
• Thermosetting Adhesives & Sealants: For formulating one-component (1K) polyurethane adhesives that cure upon exposure to heat, used in automotive assembly, electronics potting, and aerospace composites.
• Fiber Sizing and Binders: In the production of glass or carbon fiber reinforcements, where it enhances the fiber-matrix interface in composite materials.
• Elastomer and Rubber Modification: As a crosslinking agent or modifier to improve the mechanical properties, abrasion resistance, and thermal stability of synthetic rubbers and polyurethane elastomers.
• Electrical Insulation Materials: In the manufacture of wire enamels, insulating varnishes, and encapsulants for electronic components.

Basic Information

Product Name	1,3-Propanediol, 2-ethyl-2-(hydroxymethyl)-, polymer with 2,4-diisocyanato-1-methylbenzene, α-hydro-ω-hydroxypoly[ oxy(methyl-1,2-ethanediyl)] and 2,2'-oxybis[ethanol], caprolactam-blocked
CAS No.	128000-18-0
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Caprolactam-blocked polyurethane prepolymer; Blocked polyisocyanate prepolymer; TDI-based blocked prepolymer; Polyether polyol, TDI, caprolactam-blocked; 2,4-TDI caprolactam-blocked adduct; Polyurethane crosslinker, blocked; Thermosetting polyurethane resin; Urethane prepolymer, blocked
EINECS	Contact for details

Quality Control

Our blocked polyurethane prepolymers are manufactured under a strict quality management system. Each batch undergoes rigorous testing to ensure consistent performance, including analysis of blocked isocyanate content, viscosity, solids content, and deblocking temperature. Certificates of Analysis (COA) documenting these specifications are available upon request to support your quality assurance and regulatory compliance needs.

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 product is hygroscopic (moisture-sensitive); ensure containers are sealed immediately after use to prevent moisture absorption, which can lead to premature reaction and gelation. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Viscous liquid to solid
Color	Pale yellow to amber
Blocked NCO Content	Contact for details
Solids Content	Contact for details
Viscosity (at 25°C)	Contact for details
Deblocking Temperature	~150 - 180°C
Specific Gravity	Contact for details

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