Description

Benzene, Ethenyl-, Polymer With 1,3-Butadiene, Carboxy-Terminated CAS NO 79357-66-7 is a specialized functionalized styrene-butadiene copolymer featuring reactive carboxyl end groups. This chemical structure is critical for enhancing adhesion, compatibility, and cross-linking capabilities in advanced polymer formulations. It is primarily sought by manufacturers in the adhesives, sealants, coatings, and rubber modification industries who require precise control over material properties and performance.

Application

• Adhesive & Sealant Formulations: Acts as a key polymeric modifier to improve tack, peel strength, and adhesion to polar substrates.
• Impact Modifier for Engineering Plastics: Enhances the toughness and impact resistance of brittle polymer matrices like nylon or polyester.
• Reactive Polymer Intermediate: Serves as a backbone for further chemical reactions, such as chain extension or grafting, due to its carboxy-terminated functionality.
• Tire & Rubber Compounding: Used to modify styrene-butadiene rubber (SBR) properties, improving wear resistance and bonding to reinforcing materials.
• Coating Resins: Incorporated into coating systems to improve flexibility, chemical resistance, and substrate wetting.
• Compatibilizer for Polymer Blends: Facilitates the blending of otherwise immiscible polymers, such as polar and non-polar plastics.

Basic Information

Product Name	Benzene, Ethenyl-, Polymer With 1,3-Butadiene, Carboxy-Terminated
CAS No.	79357-66-7
Molecular Formula	(C8H8·C4H6)x with COOH termini
Molecular Weight	Varies by grade (Contact for details)
Synonyms	Carboxy-Terminated Styrene-Butadiene Copolymer; Carboxylated SBR; CT-SBR; Carboxyl-Terminated Poly(styrene-co-butadiene); Styrene-Butadiene Carboxylic Acid Polymer; Reactive SBR Oligomer; Carboxylated Styrene Butadiene Rubber; CAS 79357-66-7
EINECS	Contact for details

Quality Control

Our production of Carboxy-Terminated Styrene-Butadiene Copolymer adheres to stringent quality management protocols. Each batch is characterized for critical parameters including acid value, molecular weight distribution, styrene content, and viscosity to ensure consistent performance and batch-to-batch reproducibility. Certificates of Analysis (COA) documenting full specifications are available upon request.

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). Minimize exposure to air and moisture during handling to prevent clumping or property changes.

Specification

Item	Specification
Appearance	Off-white to pale yellow solid / pellets
Identification (IR)	Conforms to structure
Acid Value	Contact for details
Styrene Content	Contact for details
Molecular Weight (Mn)	Contact for details
Glass Transition Temp (Tg)	Contact for details
Moisture Content	< 1.0%

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