Description

1,3-Propanediol, 2-Ethyl-2-(Hydroxymethyl)-, Polymer With 2,4-Diisocyanato-1-Methylbenzene And 2,2'-Oxybis[Ethanol], Caprolactam-Blocked is a specialized, blocked polyurethane prepolymer designed for controlled reactivity and enhanced shelf stability. This compound is critical for formulating high-performance coatings, adhesives, and sealants that require a latent curing mechanism, unlocking upon heating to provide excellent mechanical properties and chemical resistance. It is an essential raw material for industrial manufacturers in the coatings, composite, and specialty polymer industries seeking reliable, single-component systems.

Application

• Single-Component (1K) Polyurethane Coatings: Used as a blocked isocyanate crosslinker in high-temperature cure industrial and automotive coatings, providing excellent durability, gloss, and chemical resistance.
• Powder Coatings: Serves as a key resin component, where its latent reactivity allows for stable powder formulation and smooth film formation upon baking.
• Adhesives and Sealants: Imparts strong, flexible bonds with improved moisture resistance in heat-activated adhesive tapes, films, and structural sealants.
• Electrical Insulation and Potting Compounds: Utilized in the production of thermally-cured insulating varnishes and encapsulation materials for electronic components.
• Fiber Sizing and Composite Binders: Enhances the interfacial adhesion between fibers (e.g., glass, carbon) and polymer matrices in advanced composite materials.
• Industrial Maintenance and Marine Coatings: Provides robust, protective film properties for surfaces exposed to harsh environmental conditions, abrasion, and corrosion.

Basic Information

Item	Detail
Product Name	1,3-Propanediol, 2-Ethyl-2-(Hydroxymethyl)-, Polymer With 2,4-Diisocyanato-1-Methylbenzene And 2,2'-Oxybis[Ethanol], Caprolactam-Blocked
CAS No.	128000-17-9
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Caprolactam-blocked TDI/TMP/Diethylene Glycol prepolymer; Blocked polyurethane prepolymer based on TDI, TMP, and Diethylene glycol; TDI/TMP/DEG prepolymer, caprolactam blocked; 2,4-Toluene diisocyanate polymer with trimethylolpropane and diethylene glycol, caprolactam-blocked; Blocked aliphatic polyisocyanate; Latent curing agent for polyurethanes; Thermally reactive polyurethane resin; Urethane prepolymer, blocked with ε-caprolactam
EINECS	Contact for details

Quality Control

Our production of this blocked polyurethane prepolymer adheres to strict quality management systems. Every batch undergoes comprehensive analytical testing to ensure consistent performance, including measurement of blocked isocyanate content, viscosity, solids content, and deblocking temperature. A Certificate of Analysis (COA) detailing all relevant specifications is provided with each shipment to guarantee product integrity and traceability for our global B2B clients.

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); containers must be kept sealed to prevent moisture ingress, which can lead to premature reaction and gelation. Keep away from heat sources and open flame.

Specification

Item	Specification
Appearance	Clear, viscous liquid
Color (Gardner)	≤ 3
Solids Content	70 ± 2 %
Viscosity (25°C)	2000 - 5000 mPa·s
Blocked NCO Content	6.0 - 8.0 %
Deblocking Temperature	Approx. 130 - 150 °C
Solvent	Ethyl acetate / Xylene blend

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