Description

1,3-Butanediol, polymer with 1,3-diisocyanatomethylbenzene and 2-ethyl-2-(hydroxymethyl)-1,3-propanediol, phenol-blocked 1,3-Butylene glycol, toluene diisocyanate, trimethylolpropane polymer, phenol-blocked is a specialized, phenol-blocked polyurethane prepolymer designed for controlled reactivity. This product matters as it provides a stable, one-component system that cures upon heating, releasing the blocking agent to form durable cross-linked networks. It is essential for manufacturers in the coatings, adhesives, sealants, and elastomers (CASE) industries seeking high-performance, solvent-borne, or high-solids formulations with excellent mechanical properties and chemical resistance.

Application

• High-Performance Industrial Coatings: Used as a cross-linking agent in bake-cure coatings for automotive, coil, and machinery, providing excellent hardness, gloss, and chemical resistance.
• Adhesives and Sealants: Serves as a key component in heat-activated structural adhesives and potting compounds, offering strong bonding and environmental durability.
• Elastomer Production: Employed in the manufacture of cast polyurethane elastomers for rollers, wheels, and industrial parts requiring abrasion resistance.
• Wire and Cable Insulation: Used in formulating insulating coatings that require thermal stability and electrical properties.
• Textile and Leather Finishes: Acts as a cross-linker in durable topcoats and finishes to enhance water repellency and wear resistance.
• Composite Materials: Incorporated as a matrix resin or modifier in fiber-reinforced plastics (FRP) to improve interfacial adhesion and toughness.

Basic Information

Product Name	1,3-Butanediol, polymer with 1,3-diisocyanatomethylbenzene and 2-ethyl-2-(hydroxymethyl)-1,3-propanediol, phenol-blocked 1,3-Butylene glycol, toluene diisocyanate, trimethylolpropane polymer, phenol-blocked
CAS No.	68037-29-6
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Phenol-blocked TDI/TMP/1,3-Butanediol prepolymer; Blocked polyurethane prepolymer based on TDI; Toluene diisocyanate trimethylolpropane 1,3-butanediol polymer, phenol-blocked; Phenol-capped polyurethane; PU prepolymer, phenol-blocked; Thermosetting polyurethane resin; CAS 68037-29-6
EINECS	Contact for details

Quality Control

Our phenol-blocked polyurethane prepolymer is manufactured under strict process controls to ensure batch-to-batch consistency. Quality is verified through parameters including NCO content (blocked), viscosity, solids content, and color. A Certificate of Analysis (COA) detailing these specifications is provided with each shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive). Keep container tightly sealed when not in use to prevent moisture absorption, which can lead to premature reaction or gelation. Keep away from heat and open flame.

Specification

Item	Specification
Appearance	Yellowish to amber viscous liquid
Solids Content	Contact for details
Viscosity (at 25°C)	Contact for details
Blocked NCO Content	Contact for details
Color (Gardner)	≤ 4
De-blocking Temperature	~150-180°C

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