Description

Polybutadiene, Dicarboxy Terminated CAS NO 68891-79-2 is a reactive liquid polymer featuring carboxyl functional groups at the chain ends. This functionalization makes it a valuable intermediate for synthesizing high-performance polymers, such as polyurethanes, polyamides, and epoxy resins, where it imparts flexibility, impact resistance, and adhesion properties. It is essential for manufacturers in the coatings, adhesives, sealants, and elastomers (CASE) industries, as well as for advanced composite and rubber modification applications.

Application

• Reactive Modifier for Epoxy Resins: Used to toughen epoxy systems for coatings, adhesives, and composite matrices, improving crack resistance and flexibility.
• Polyurethane Pre-polymer Synthesis: Serves as a polyol component to create flexible, resilient polyurethane foams, elastomers, and coatings.
• Adhesive and Sealant Formulations: Enhances the flexibility, durability, and adhesion properties of high-performance structural and pressure-sensitive adhesives.
• Rubber and Elastomer Modification: Incorporated into rubber compounds (e.g., SBR, natural rubber) to improve processing, tensile strength, and low-temperature properties.
• Coating Resins: A key ingredient in formulating flexible, chemical-resistant, and weatherable industrial and protective coatings.
• Composite Materials: Acts as a matrix resin modifier in fiber-reinforced plastics to enhance impact strength and reduce brittleness.

Basic Information

Product Name	Polybutadiene, Dicarboxy Terminated
CAS No.	68891-79-2
Molecular Formula	Typically CnH2n-2O4 (Variable)
Molecular Weight	Variable (Typically 2,000 - 5,000 g/mol)
Synonyms	Carboxyl-Terminated Polybutadiene (CTPB); Butadiene Homopolymer, Carboxy-Terminated; Dicarboxy-Terminated Polybutadiene Liquid Polymer; Poly(butadiene-co-acrylic acid); Reactive Liquid Polybutadiene; HYCAR CTB; Krasol LBH; Telagen CT
EINECS	Contact for details

Quality Control

Our Polybutadiene, Dicarboxy Terminated is manufactured under a strict quality management system. Each batch undergoes rigorous testing for key parameters including acid value, viscosity, molecular weight, and microstructure to ensure batch-to-batch consistency and performance. Certificates of Analysis (COA) documenting these specifications are available upon request to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area under an inert atmosphere (e.g., nitrogen) to prevent oxidation and moisture absorption. Recommended storage temperature is between 15°C and 25°C. Keep away from heat, sparks, and open flame.

Specification

Item	Specification
Appearance	Clear, viscous liquid
Color (Gardner)	≤ 4
Acid Value (mg KOH/g)	40 - 50
Viscosity (cP @ 25°C)	30,000 - 80,000
Number Average Molecular Weight (Mn)	2,500 - 4,500 g/mol
Microstructure (1,2-vinyl, %)	15 - 25
Moisture Content (KF)	≤ 0.1 %

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