Description

11Methylenebis4Isocyanatobenzenehomopolymerbutylalcoholblocked is a blocked polyisocyanate prepolymer, a key intermediate designed for controlled reactivity in advanced coating systems. This product matters as it provides a stable, latent source of isocyanate functionality, enabling the formulation of one-component (1K) polyurethane systems that cure upon heating. It is primarily needed by manufacturers in the automotive, industrial maintenance, and plastic coating sectors seeking high-performance, durable finishes with simplified application processes.

Application

• One-Component (1K) Polyurethane Coatings: As a crosslinking agent in heat-curable paints and varnishes for metals, plastics, and wood.
• Automotive OEM and Refinish: In primer-surfacers, clear coats, and base coats requiring excellent chemical resistance and hardness.
• Industrial Maintenance Coatings: For protective coatings on machinery, structural steel, and industrial flooring.
• Plastic Coatings: Adhesion promotion and durability enhancement for coatings on automotive trim, consumer electronics, and other plastic substrates.
• Powder Coatings: As a crosslinker in thermosetting powder coating formulations.
• Adhesives and Sealants: In heat-activated polyurethane adhesive systems for specialized bonding applications.
• Coil Coatings: For pre-coated metal sheets used in construction and appliances.

Basic Information

Product Name	11Methylenebis4Isocyanatobenzenehomopolymerbutylalcoholblocked
CAS No.	186321-98-2
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Blocked MDI prepolymer; Butanol-blocked MDI homopolymer; Poly[(phenyl isocyanate)-co-formaldehyde], butyl alcohol-blocked; 4,4'-Methylenebis(phenyl isocyanate) homopolymer, butanol-blocked; Blocked polyisocyanate; Latent hardener; 1K PU crosslinker; Thermosetting polyurethane resin
EINECS	Contact for details

Quality Control

Our production of blocked polyisocyanate prepolymers follows stringent quality protocols to ensure batch-to-batch consistency and performance reliability. Each lot is tested for critical parameters including blocked isocyanate content, viscosity, solids content, and deblocking temperature. Certificates of Analysis (COA) documenting full specifications are available upon request, supporting compliance with relevant industry standards for coating raw materials.

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 product is hygroscopic (moisture-sensitive); containers must be kept sealed to prevent contact with atmospheric moisture, which can lead to premature reaction and gelation.

Specification

Item	Specification
Appearance	Clear, viscous liquid
Color (Gardner)	≤ 3
Solids Content	70 - 75%
Viscosity (at 25°C)	2000 - 5000 mPa·s
Blocked NCO Content	8.0 - 10.0 %
Deblocking Temperature	≈ 130 - 150°C
Identification (IR)	Conforms

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