Description

1,3-Propanediol, 2-ethyl-2-(hydroxymethyl)-, polymer with α-hydro-ω-hydroxypoly[ oxy(methyl-1,2-ethanediyl)] and 1,1'-methylenebis[4-isocyanatobenzene], Me Et ketone oxime-blocked is a high-performance, blocked polyurethane prepolymer designed for advanced coating and adhesive formulations. This specialized chemical offers a unique balance of flexibility, chemical resistance, and controlled reactivity upon curing, making it a critical component for demanding industrial applications. It is primarily utilized by formulators in the automotive, industrial maintenance, and specialty plastics sectors seeking durable, high-performance finishes and bonds.

Application

• High-Performance Industrial Coatings: Used as a key resin component in two-component (2K) polyurethane coatings for metal substrates, providing excellent corrosion resistance, abrasion resistance, and weatherability.
• Automotive Refinish and OEM Coatings: Formulated into primers, basecoats, and clearcoats that require superior mechanical properties, chemical resistance, and gloss retention.
• Heavy-Duty Adhesives and Sealants: Serves as a backbone polymer in structural adhesives and elastic sealants for construction, transportation, and assembly applications.
• Plastic and Composite Coatings: Provides excellent adhesion and flexibility for coatings on plastics (e.g., automotive bumpers, consumer electronics) and composite materials.
• Wood Finishes: Used in high-end furniture and flooring finishes that demand exceptional durability, scratch resistance, and clarity.
• Corrosion-Protective Primers: A critical ingredient in primers for bridges, pipelines, and offshore structures where long-term protection against harsh environments is paramount.

Basic Information

Item	Detail
Product Name	1,3-Propanediol, 2-ethyl-2-(hydroxymethyl)-, polymer with α-hydro-ω-hydroxypoly[ oxy(methyl-1,2-ethanediyl)] and 1,1'-methylenebis[4-isocyanatobenzene], Me Et ketone oxime-blocked
CAS No.	68130-41-6
Molecular Formula	Complex Polymer (Contact for details)
Molecular Weight	Varies by grade (Contact for details)
Synonyms	Blocked Polyurethane Prepolymer; Oxime-blocked Polyurethane Resin; MEKO-blocked Polyisocyanate Adduct; Polyether Polyol, TMP-initiated, polymer with MDI, MEKO-blocked; Trimethylolpropane Ethoxylate - MDI Adduct, MEKO-blocked; 2-Butanone oxime-blocked polyurethane prepolymer; Aliphatic polyether-based blocked polyisocyanate; PU crosslinker, blocked
EINECS	Contact for details

Quality Control

Our production of this blocked polyurethane prepolymer adheres to strict quality management systems, ensuring batch-to-batch consistency and performance reliability. Key parameters such as blocked isocyanate content, viscosity, solids content, and color are rigorously monitored. A comprehensive Certificate of Analysis (COA) detailing all relevant specifications is provided with every shipment 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 temperatures between 15°C and 25°C (59°F and 77°F). Keep away from heat, sparks, and open flame. Moisture-sensitive; ensure containers are properly sealed to prevent exposure to atmospheric humidity, which can lead to premature reaction.

Specification

Item	Specification
Appearance	Clear, viscous liquid
Color (Gardner)	≤ 3
Solids Content	70 ± 2 %
Viscosity (25°C)	3000 - 6000 mPa·s
Blocked NCO Content	6.0 - 8.0 %
Free Monomer (MDI)	< 0.5 %
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.