Description

Benzene, 1,1-Methylenebis4-Isocyanato-, Homopolymer is a polymeric isocyanate derived from methylene diphenyl diisocyanate (MDI). This compound is a critical intermediate and cross-linking agent, valued for its ability to impart durability, chemical resistance, and structural integrity to final materials. It is essential for manufacturers in the polyurethane, coatings, and advanced adhesive industries seeking to produce high-performance elastomers, sealants, and thermoset plastics.

Application

• As a key cross-linking agent and chain extender in the production of high-performance polyurethane elastomers and foams.
• In the formulation of durable, chemical-resistant industrial coatings and paints for automotive, marine, and infrastructure applications.
• As a critical component in the synthesis of specialty adhesives and sealants with superior bonding strength and flexibility.
• For manufacturing thermoset plastics and composites used in electrical components and automotive parts.
• In the production of waterproofing membranes and construction materials requiring long-term durability.
• As a reactive intermediate in organic synthesis for pharmaceuticals and agrochemicals (subject to specific purity grades).

Basic Information

Product Name	Benzene, 1,1-Methylenebis4-Isocyanato-, Homopolymer
CAS No.	25686-28-6
Molecular Formula	(C15H10N2O2)n
Molecular Weight	Polymeric (Variable)
Synonyms	Polymeric MDI; PMDI; MDI Homopolymer; 4,4'-Methylenebis(phenyl isocyanate) polymer; Diphenylmethane diisocyanate polymer; Isocyanic acid, polymethylenepolyphenylene ester; Poly(methylene polyphenylene isocyanate); Crude MDI; Polymeric diphenylmethane diisocyanate
EINECS	Contact for details

Quality Control

Our Benzene, 1,1-Methylenebis4-Isocyanato-, Homopolymer is produced under a stringent quality management system. Each batch undergoes rigorous analytical testing to ensure consistent purity, reactivity (NCO content), viscosity, and acid value meet defined specifications. Certificates of Analysis (COA) documenting these parameters are available upon request 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 room temperature (15-25°C). This material is hygroscopic (moisture-sensitive). Containers must be kept tightly sealed under a dry inert atmosphere (e.g., nitrogen) to prevent moisture ingress and premature polymerization. Isolate from strong bases, amines, alcohols, and water.

Specification

Item	Specification
Appearance	Brown viscous liquid
Identification (IR)	Conforms
NCO Content	30.0 - 32.0 %
Viscosity (25°C)	150 - 250 mPa·s
Acid Value (as HCl)	≤ 0.1 %
Hydrolyzable Chlorine	≤ 0.1 %
Specific Gravity (25°C)	1.22 - 1.25

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