Description

Isocyanic Acid, Polymethylenepolyphenylene Ester, Polymer With Methyloxirane And 1,2-Propanediol CAS NO 67924-36-1 is a polymeric isocyanate, specifically a polyisocyanate prepolymer derived from PMDI (polymethylene polyphenylene isocyanate) and alkoxylated polyols. This compound is a crucial intermediate in the formulation of high-performance polyurethane systems, providing the essential reactive isocyanate (-NCO) groups. It is primarily sought by manufacturers in the coatings, adhesives, sealants, and elastomers (CASE) industries, as well as for producing rigid and flexible foams, where it imparts excellent mechanical properties, chemical resistance, and durability.

Application

• High-Performance Polyurethane Coatings: Used as a curing agent or crosslinker in two-component (2K) polyurethane coatings for industrial, automotive, and marine applications, offering superior hardness, gloss, and weatherability.
• Adhesives and Sealants: Serves as a key component in formulating polyurethane-based structural adhesives, laminating adhesives, and high-strength sealants with strong bonding and flexibility.
• Elastomers: Employed in the production of cast, thermoplastic, and millable polyurethane elastomers for wheels, rollers, gaskets, and industrial parts requiring abrasion resistance.
• Rigid Polyurethane Foams: Acts as an isocyanate component in rigid foam formulations used for thermal insulation in construction, appliances, and refrigeration.
• Flexible Foam Modification: Used to modify the properties of flexible polyurethane foams, enhancing load-bearing capacity and durability for furniture and automotive seating.
• Binder Systems: Utilized in foundry sand binders, composite wood binders (e.g., particleboard), and other composite material applications.
• Waterborne Polyurethane Dispersions (PUDs): Can be used in the synthesis of aqueous polyurethane dispersions for environmentally friendly coating and adhesive systems.

Basic Information

Item	Details
Product Name	Isocyanic Acid, Polymethylenepolyphenylene Ester, Polymer With Methyloxirane And 1,2-Propanediol
CAS No.	67924-36-1
Molecular Formula	Complex Polymer (Contact for details)
Molecular Weight	Polymer (Contact for details)
Synonyms	Polymeric MDI prepolymer; PMDI-polyol prepolymer; Polyisocyanate prepolymer; Poly(methylene polyphenylene isocyanate) polyol adduct; Isocyanate-terminated polyether; Polyurethane prepolymer; Modified polymeric MDI; Alkoxylated PMDI; NCO-terminated polyether; CAS 67924-36-1
EINECS	Contact for details

Quality Control

Our production of this polyisocyanate prepolymer adheres to rigorous quality control protocols to ensure batch-to-batch consistency and performance reliability. Key parameters such as % NCO content, viscosity, and hydrolyzable chlorine are strictly monitored. A comprehensive Certificate of Analysis (COA) is provided with each shipment, detailing specifications against agreed standards. Our quality management system is designed to meet the demands of industrial and specialty chemical applications.

Storage

Preserve in a tightly closed, moisture-proof container, protected from light. This product is hygroscopic (moisture-sensitive). Store in a cool, dry, well-ventilated area at temperatures typically between 15°C and 25°C (59°F and 77°F). Keep away from heat, open flames, and sources of ignition. Isolate from moisture, water, alcohols, amines, and other compounds containing active hydrogen to prevent premature reaction and gelation.

Specification

Item	Specification
Appearance	Clear, pale yellow to brown viscous liquid
NCO Content	Contact for details
Viscosity (25°C)	Contact for details
Density (25°C)	Contact for details
Flash Point	> 200 °C (Closed cup)
Hydrolyzable Chlorine	< 0.1 %
Identification (IR)	Conforms

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