Description

Castor Oil, Polymer With 1,1'-Methylenebis[4-Isocyanatobenzene] And Polypropylene Glycol is a specialized polyurethane prepolymer derived from castor oil, a diphenylmethane diisocyanate (MDI), and polypropylene glycol. This engineered polymer offers a unique combination of flexibility, hydrolytic stability, and adhesion derived from its bio-based and synthetic components. It is primarily required by formulators in the adhesives, sealants, coatings, and elastomers industries seeking to enhance product performance with renewable content.

Application

• Polyurethane Adhesives & Sealants: Serves as a key prepolymer component for formulating flexible, moisture-curing adhesives and sealants with good tack and bond strength to various substrates.
• Coatings & Paints: Used in the synthesis of polyurethane dispersions (PUDs) or solvent-based coatings, providing films with excellent abrasion resistance, chemical resistance, and durability.
• Elastomer Production: Acts as a building block for casting or molding polyurethane elastomers, contributing to a balance of mechanical properties and processing characteristics.
• Composite Materials: Employed as a matrix resin or modifier in composite systems, improving impact resistance and interfacial adhesion between fibers and the polymer matrix.
• Footwear & Automotive Components: Utilized in the production of soles, gaskets, and other molded parts where a combination of flexibility, resilience, and environmental resistance is critical.
• Flexible Foams: Can be incorporated into formulations for specialized flexible polyurethane foams requiring specific resilience and load-bearing properties.

Basic Information

Product Name	Castor Oil, Polymer With 1,1'-Methylenebis[4-Isocyanatobenzene] And Polypropylene Glycol
CAS No.	68525-78-0
Molecular Formula	Contact for details
Molecular Weight	Variable (Polymer)
Synonyms	Castor oil-MDI-PPG prepolymer; Polyurethane prepolymer based on castor oil and MDI; MDI-castor oil-polypropylene glycol adduct; 1,1'-Methylenebis(4-isocyanatobenzene), polymer with castor oil and polypropylene glycol; Castor oil polyol-MDI prepolymer; PPG-castor oil-MDI terpolymer; Bio-based polyurethane prepolymer; PU prepolymer from castor oil
EINECS	Contact for details

Quality Control

Our production of this polyurethane prepolymer adheres to strict quality management protocols to ensure batch-to-batch consistency and performance reliability. Key parameters such as NCO content, viscosity, and hydroxyl value are rigorously monitored. A comprehensive Certificate of Analysis (COA) detailing all relevant specifications is provided with each shipment to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed, moisture-proof 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 should be handled under a dry atmosphere to prevent premature reaction and gelation.

Specification

Item	Specification
Appearance	Viscous liquid
Color (Gardner)	≤ 4
NCO Content (%)	To be specified per grade
Viscosity (cPs @ 25°C)	To be specified per grade
Hydroxyl Value (mg KOH/g)	To be specified per grade
Moisture Content (Karl Fischer)	≤ 0.05%
Specific Gravity (25°C)	1.05 - 1.10

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