Description

Butadiene Rubber, Carboxy-Terminated is a specialized reactive liquid polymer, a functionalized derivative of polybutadiene with carboxylic acid end groups. This unique structure provides enhanced compatibility with polar substrates and serves as a versatile chemical intermediate for chain extension, cross-linking, and polymer modification. It is essential for formulators and manufacturers in the polymer and coatings industries seeking to improve adhesion, toughness, and mechanical properties. The compound is identified by CAS No. 63231-64-1.

Application

• Adhesive & Sealant Formulation: Acts as a reactive toughening agent and flexibilizer in epoxy, polyurethane, and acrylic-based structural adhesives and sealants.
• Coatings & Inks: Used as a modifier in coatings to enhance flexibility, impact resistance, and adhesion to difficult substrates.
• Polymer Modification: Serves as a macromonomer or chain extender for synthesizing block copolymers, thermoplastic elastomers (TPEs), and impact-modified plastics.
• Rubber Compounding: Improves the processing and physical properties of rubber compounds, including tire treads and industrial rubber goods.
• Composite Materials: Enhances the interfacial bonding and mechanical performance of fiber-reinforced polymer composites.
• Automotive & Aerospace: Found in high-performance components requiring durable, vibration-damping, and lightweight polymeric materials.

Basic Information

Product Name	Butadiene Rubber, Carboxy-Terminated
CAS No.	63231-64-1
Molecular Formula	(C4H6)n with COOH termini
Molecular Weight	Varies by grade (typically 1,000 - 5,000 g/mol). Contact for details.
Synonyms	Carboxyl-terminated polybutadiene (CTPB); Carboxy-terminated butadiene rubber; CTPB rubber; Liquid carboxyl-terminated polybutadiene; Reactive liquid polymer; Polybutadiene, carboxy-terminated; Butadiene homopolymer, carboxy-terminated
EINECS	Contact for details.

Quality Control

Our Butadiene Rubber, Carboxy-Terminated is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure consistency in key parameters such as acid value, molecular weight, viscosity, and functionality. Certificates of Analysis (COA) documenting these specifications are available upon request to support your quality assurance and regulatory compliance needs.

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 easily oxidized; for long-term storage, maintaining an inert atmosphere (e.g., under nitrogen) is recommended to preserve functionality. Keep away from strong oxidizing agents, strong acids, and strong bases.

Specification

Item	Specification
Appearance	Viscous liquid, clear to amber
Acid Value (mg KOH/g)	Contact for details
Viscosity (cP @ 25°C)	Contact for details
Number Average Molecular Weight (Mn)	Contact for details
Functionality (COOH groups per chain)	~2.0
Volatile Matter (%)	< 1.0

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