Description

Isocyanic Acid, Polymethylenepolyphenylene Ester, Polymers With Hydroxy-Terminated Polybutadiene is a specialized polymeric isocyanate, commonly known as a polyisocyanate prepolymer or adduct. This compound is valued for its unique combination of chemical reactivity and elastomeric properties derived from its polybutadiene backbone. It is primarily required by manufacturers in the coatings, adhesives, sealants, and elastomers (CASE) industries seeking to enhance product flexibility, impact resistance, and chemical durability. The material is supplied under strict quality control to ensure consistent performance in demanding formulations.

Application

• As a key crosslinking agent in high-performance polyurethane coatings for automotive, industrial, and marine applications.
• Formulation of flexible adhesives and sealants with excellent resistance to vibration, shock, and low temperatures.
• Production of castable and millable polyurethane elastomers for gaskets, rollers, and wear-resistant parts.
• Modifier for epoxy systems to improve toughness and impact resistance in composite materials.
• Base component in the synthesis of specialty polymers requiring a balance of urethane linkages and hydrocarbon chain flexibility.
• Used in waterproofing membranes and corrosion-protective coatings due to its hydrolytic stability.

Basic Information

Product Name	Isocyanic Acid, Polymethylenepolyphenylene Ester, Polymers With Hydroxy-Terminated Polybutadiene
CAS No.	68442-03-5
Molecular Formula	Complex Polymer - Contact for details
Molecular Weight	Varies by grade - Contact for details
Synonyms	Polymeric MDI modified with hydroxy-terminated polybutadiene; HTPB-modified PMPPI; Polyisocyanate prepolymer based on HTPB; HTPB-MDI prepolymer; Hydroxyl-terminated polybutadiene polyisocyanate adduct; Polybutadiene polyisocyanate; CAS 68442-03-5; Reactive polyurethane prepolymer
EINECS	Contact for details

Quality Control

Our production of this polyisocyanate adduct follows a rigorous quality management system. Each batch is tested to ensure consistent NCO content, viscosity, and functionality, which are critical for predictable polymerization kinetics and final polymer properties. Certificates of Analysis (COA) detailing these key parameters are provided with every shipment. We adhere to relevant industry standards and can support compliance requirements for specific applications.

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 material is hygroscopic (moisture-sensitive) and exposure to atmospheric moisture will lead to reaction and viscosity increase. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Clear, viscous liquid
Color (Gardner)	≤ 3
NCO Content	As per grade (Typ. 5-12%)
Viscosity @ 25°C	As per grade (Typ. 1000-5000 mPa·s)
Specific Gravity @ 25°C	1.00 - 1.10
Moisture (Karl Fischer)	≤ 0.05%
Identification (IR)	Conforms

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