Description

Polyoxy(methyl-1,2-ethanediyl), .alpha.-hydro-.omega.-hydroxy-, ether with 2-ethyl-2-(hydroxymethyl)-1,3-propanediol (3:1), polymer with .alpha.-hydro-.omega.-hydroxypolyoxy(methyl-1,2-ethanediyl) and 1,1-methylenebis4-isocyanatobenzene, isocyanate-termin is a specialized, isocyanate-terminated prepolymer derived from polyether polyols and MDI (4,4'-diphenylmethane diisocyanate). This compound serves as a crucial reactive intermediate, providing the essential NCO groups for forming polyurethane networks. It is primarily required by manufacturers in the coatings, adhesives, sealants, and elastomers (CASE) industries seeking to formulate high-performance, cross-linked polyurethane products with tailored properties.

Application

• Polyurethane Coatings Binder: As a key component in high-performance two-component (2K) polyurethane coatings for industrial, automotive, and protective applications.
• Adhesive & Sealant Formulation: Used in the production of moisture-curing and chemically curing polyurethane adhesives and sealants with excellent adhesion and flexibility.
• Elastomer Manufacturing: Serves as a prepolymer for casting or molding polyurethane elastomers used in wheels, rollers, and impact-resistant parts.
• Binder for Composites: Employed as a matrix resin in the production of fiber-reinforced composites and industrial binders.
• Waterproofing Membranes: A critical raw material in formulating liquid-applied waterproofing and roofing membranes.
• Flexible Foam Modification: Used to modify the properties of flexible polyurethane foams for specialized applications.

Basic Information

Item	Details
Product Name	Polyoxy(methyl-1,2-ethanediyl), .alpha.-hydro-.omega.-hydroxy-, ether with 2-ethyl-2-(hydroxymethyl)-1,3-propanediol (3:1), polymer with .alpha.-hydro-.omega.-hydroxypolyoxy(methyl-1,2-ethanediyl) and 1,1-methylenebis4-isocyanatobenzene, isocyanate-termin
CAS No.	68130-40-5
Molecular Formula	Contact for details
Molecular Weight	Contact for details (Variable, based on polyol chain length and stoichiometry)
Synonyms	MDI-based polyether prepolymer; Isocyanate-terminated polyether prepolymer; Polyether polyol-MDI prepolymer; NCO-terminated polyoxyethylene polyoxypropylene copolymer; Polyurethane prepolymer, isocyanate-terminated; Polyoxyalkylene polyol, polymer with diphenylmethane diisocyanate; 4,4'-MDI polyether prepolymer
EINECS	Contact for details

Quality Control

Our isocyanate-terminated prepolymers are manufactured under controlled conditions to ensure batch-to-batch consistency and performance reliability. Quality is assured through rigorous testing of key parameters including NCO content, viscosity, and moisture content. Certificates of Analysis (COA) detailing these specifications are provided with each shipment. Our production adheres to ISO 9001 quality management principles, ensuring traceability and compliance with industry standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at temperatures recommended for the specific grade (typically between 15°C and 25°C). This product is hygroscopic (moisture-sensitive) and must be protected from atmospheric moisture to prevent premature reaction and viscosity increase. Keep away from heat, sparks, and open flame. Under recommended storage conditions, the product is typically stable.

Specification

Item	Specification
Appearance	Clear, pale yellow to amber viscous liquid
NCO Content	As per grade (Typical range: 3-15%)
Viscosity @ 25°C	As per grade
Moisture Content (Karl Fischer)	≤ 0.05%
Specific Gravity @ 25°C	As per grade
Color (Gardner)	≤ 4

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