Description

Benzene, 1,1-Methylenebis4-Isocyanato-, Polymers With Hydroxy-Terminated Polybutadiene CAS NO 66072-10-4 is a specialized polyurethane prepolymer formed from MDI (4,4'-diphenylmethane diisocyanate) and hydroxyl-terminated polybutadiene (HTPB). This product is engineered to deliver exceptional flexibility, hydrolytic stability, and adhesion to low-surface-energy substrates. It is primarily utilized by formulators in the adhesives, sealants, coatings, and elastomers industries seeking to enhance the toughness and moisture resistance of their polyurethane systems.

Application

• High-Performance Elastomers: Used as a key component in the synthesis of castable and millable polyurethane elastomers requiring superior dynamic properties and low-temperature flexibility.
• Specialty Adhesives & Sealants: Serves as a prepolymer base for formulating flexible, moisture-curing adhesives and sealants with excellent bond strength to plastics, metals, and composites.
• Impact-Resistant Coatings: Incorporated into coating formulations to improve abrasion resistance, flexibility, and durability for industrial and protective coatings.
• Potting & Encapsulation Compounds: Ideal for electrical and electronic potting applications where resistance to thermal cycling and moisture is critical.
• Composite Binders: Acts as a polymeric binder in composite materials, including rocket propellants and vibration-damping components, leveraging HTPB's energy-absorbing characteristics.
• Flexible Foams: Used in the production of specialized, high-resilience flexible foams where a combination of softness and strength is required.

Basic Information

Product Name	Benzene, 1,1-Methylenebis4-Isocyanato-, Polymers With Hydroxy-Terminated Polybutadiene
CAS No.	66072-10-4
Molecular Formula	Polymeric Mixture
Molecular Weight	Varies by formulation
Synonyms	MDI-HTPB Prepolymer; Polyurethane Prepolymer based on MDI and HTPB; 4,4'-Diphenylmethane diisocyanate polymer with hydroxyl-terminated polybutadiene; HTPB-MDI Adduct; Isocyanate-terminated polybutadiene; Liquid urethane prepolymer; Polybutadiene polyurethane; R-45M-MDI Prepolymer; Telechelic polybutadiene urethane
EINECS	Contact for details

Quality Control

Our MDI-HTPB prepolymer is manufactured under strict process controls to ensure batch-to-batch consistency. Quality is verified through a comprehensive suite of analytical tests, including measurement of NCO content, viscosity, and moisture content. Certificates of Analysis (COA) detailing these specifications are 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, and well-ventilated area at temperatures recommended for the specific grade (typically between 15-25°C). This product is hygroscopic (moisture-sensitive); containers must be kept sealed under a dry atmosphere (e.g., nitrogen blanket) to prevent premature reaction and gelation.

Specification

Item	Specification
Appearance	Viscous liquid, amber to brown
NCO Content (%)	As per grade (e.g., 4.0 - 8.0)
Viscosity (cP @ 25°C)	As per grade
Moisture Content (ppm, max)	< 200
Specific Gravity (@ 25°C)	~1.01 - 1.05
Identification (IR)	Conforms to standard

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