Description

1,3-Propanediol, 2-Ethyl-2-(Hydroxymethyl)-, Polymer With 1,3-Diisocyanatomethylbenzene, 2-Butoxyethanol-Blocked is a specialized blocked polyurethane prepolymer designed for high-performance coating and adhesive formulations. This product matters as it provides a stable, latent-reactive component that cures upon heating, offering excellent control over pot life and final film properties for demanding industrial applications. It is primarily needed by formulators in the automotive, industrial maintenance, and specialty coatings sectors seeking durable, chemical-resistant finishes.

Application

• High-Performance Industrial Coatings: Used as a crosslinker in heat-cured polyurethane systems for machinery, agricultural equipment, and metal substrates requiring superior abrasion and chemical resistance.
• Automotive Refinish and OEM Coatings: A key component in primer-surfacers and clear coats where controlled cure profiles and excellent adhesion are critical.
• Adhesives and Sealants: Serves as a reactive building block in one-component, heat-activated polyurethane adhesives for assembly and bonding applications.
• Plastic Coatings: Formulated into coatings for plastic components, providing enhanced durability and weatherability.
• Wire and Cable Enamels: Utilized in insulating varnishes and coatings that require thermal curing and robust electrical properties.
• Corrosion-Resistant Primers: Incorporated into anti-corrosive primer systems for steel and other metals in harsh environments.

Basic Information

Item	Details
Product Name	1,3-Propanediol, 2-Ethyl-2-(Hydroxymethyl)-, Polymer With 1,3-Diisocyanatomethylbenzene, 2-Butoxyethanol-Blocked
CAS No.	70693-24-2
Molecular Formula	Complex Polymer - Contact for details
Molecular Weight	Varies by formulation - Contact for details
Synonyms	Blocked Polyurethane Prepolymer based on TMP and TMXDI; 2-Butoxyethanol-blocked TMXDI/TMP prepolymer; Trimethylolpropane (TMP) polymer with m-tetramethylxylylene diisocyanate (TMXDI), 2-butoxyethanol-blocked; Polyurethane crosslinker, blocked; Latent hardener for PU coatings; m-TMXDI/TMP polyurethane, blocked with butyl glycol; Thermosetting polyurethane resin.
EINECS	Contact for details

Quality Control

Our production of this blocked polyurethane prepolymer adheres to stringent quality protocols to ensure batch-to-batch consistency and performance reliability. Each lot is characterized for critical parameters including blocked isocyanate content, viscosity, solids content, and color. We provide comprehensive Certificates of Analysis (COA) with every shipment, detailing all relevant specifications to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C / 59-77°F). This product is hygroscopic (moisture-sensitive); containers must be kept tightly sealed to prevent moisture ingress, which can lead to premature reaction and gelation. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Clear, viscous liquid
Color (Gardner)	≤ 3
Solids Content	70 - 75%
Viscosity (at 25°C)	2000 - 5000 mPa·s
Blocked NCO Content	8.0 - 10.0 %
Specific Gravity (25°C)	1.05 - 1.10
Flash Point	> 100 °C

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