Description

Poly(Oxy-1,4-Butanediyl), .Alpha.-Hydro-.Omega.-Hydroxy-, Polymer With 1,1-Methylenebis4-Isocyanatobenzene, Isocyanate-Terminated is a high-performance, isocyanate-terminated prepolymer derived from poly(tetramethylene ether) glycol (PTMEG) and 4,4'-methylenebis(phenyl isocyanate) (MDI). This specialized chemical is engineered to serve as a critical reactive intermediate, offering superior mechanical properties and hydrolytic stability in final polymer formulations. It is essential for manufacturers in the polyurethane, adhesive, sealant, and specialty elastomer industries seeking to enhance product durability and performance.

Application

• High-Performance Polyurethane Elastomers: A key prepolymer for casting and thermoplastic polyurethane (TPU) systems requiring excellent abrasion resistance, low-temperature flexibility, and high tensile strength.
• Industrial Adhesives & Sealants: Used as a base component in moisture-curing and two-component polyurethane adhesives and sealants for construction, automotive, and marine applications.
• Specialty Coatings: Formulated into durable, chemical-resistant, and flexible coatings for industrial flooring, pipe linings, and protective industrial finishes.
• Fiber Spandex (Lycra®-type): Acts as a crucial intermediate in the production of high-quality elastic fibers for the textile industry.
• Automotive Components: Used in the manufacture of bushings, gaskets, seals, and other under-the-hood parts that demand resilience and longevity.
• Footwear & Sporting Goods: Provides the foundation for soles, ski boots, and other items where dynamic performance and durability are critical.
• Medical Device Components: Employed in the production of biocompatible tubing, catheters, and other flexible medical-grade polyurethane parts.

Basic Information

Item	Details
Product Name	Poly(Oxy-1,4-Butanediyl), .Alpha.-Hydro-.Omega.-Hydroxy-, Polymer With 1,1-Methylenebis4-Isocyanatobenzene, Isocyanate-Terminated
CAS No.	68081-89-0
Molecular Formula	Contact for details
Molecular Weight	Varies by grade (typically 500-5000 g/mol)
Synonyms	PTMEG-MDI Prepolymer; Isocyanate-Terminated Poly(tetramethylene ether) Glycol; MDI-PTMEG Prepolymer; Poly(tetramethylene ether) glycol terminated with 4,4'-MDI; PolyTHF-MDI Prepolymer; 4,4'-Methylenebis(phenyl isocyanate), polymer with poly(tetramethylene ether) glycol; Polyurethane Prepolymer based on PTMEG and MDI; Isocyanate-functional polyether prepolymer
EINECS	Contact for details

Quality Control

Our Poly(Oxy-1,4-Butanediyl), .Alpha.-Hydro-.Omega.-Hydroxy-, Polymer With 1,1-Methylenebis4-Isocyanatobenzene, Isocyanate-Terminated is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure consistent performance, including measurement of NCO content, viscosity, and moisture levels. Certificates of Analysis (COA) detailing all specifications are provided with every shipment to guarantee traceability and compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. This product is hygroscopic (moisture-sensitive). Store in a cool, dry, and well-ventilated area at temperatures recommended for the specific grade (typically between 15°C and 25°C). Containers must be kept tightly sealed under a dry inert atmosphere (e.g., nitrogen) to prevent moisture absorption and premature reaction. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid
NCO Content	Contact for details
Viscosity @ 25°C	Contact for details
Moisture (Karl Fischer)	≤ 0.05%
Specific Gravity @ 25°C	Contact for details
Identification (IR)	Conforms

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