Description

Butylene/Ethylene/Styrene Copolymer is a versatile thermoplastic elastomer that combines the flexibility of rubber with the processability of plastic. This material is valued for its excellent balance of softness, resilience, and weatherability, making it a critical component in high-performance formulations. It is primarily sought after by manufacturers in the polymer modification, adhesive, and sealant industries seeking to enhance product durability and performance.

Application

• As a modifier and compatibilizer in polymer blends and alloys to improve impact strength and flexibility.
• Key component in the formulation of hot-melt and pressure-sensitive adhesives (PSAs) for tapes and labels.
• Used in the production of sealants and caulks for construction and automotive applications, providing lasting elasticity.
• As a viscosity index improver and tackifier in various lubricant and grease formulations.
• Employed in bitumen modification for roofing membranes and road paving to enhance low-temperature flexibility.
• Base polymer for molded or extruded flexible goods requiring a soft touch and good compression set.
• Used in wire and cable jacketing compounds to improve environmental stress crack resistance.
• As an additive in consumer goods such as grips, handles, and soft-touch overmolds.

Basic Information

Product Name	Butylene/Ethylene/Styrene Copolymer
CAS No.	57271-36-0
Molecular Formula	(C4H8·C2H4·C8H8)x
Molecular Weight	Varies (Polymer)
Synonyms	Poly(butylene-ethylene-styrene); Butylene Ethylene Styrene Terpolymer; BES Copolymer; Styrene-Ethylene-Butylene Copolymer; SEBS (commonly hydrogenated form); Thermoplastic Elastomer (TPE) based on butylene, ethylene, and styrene; Ethylene Butylene Styrene Terpolymer; 2-Butene, polymer with ethene and phenylethene
EINECS	Contact for details

Quality Control

Our Butylene/Ethylene/Styrene Copolymer is manufactured under a stringent quality management system. Each batch is tested against critical parameters including monomer content, molecular weight distribution, and stabilizer levels to ensure consistent performance and batch-to-batch uniformity. Certificates of Analysis (COA) detailing specific test results are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (typically 15-25°C). Keep away from strong oxidizing agents and heat sources to maintain polymer integrity.

Specification

Item	Specification
Appearance	White to off-white pellets or granules
Identification (IR)	Complies
Styrene Content	20 - 40 %
Ethylene/Butylene Ratio	Varies by grade
Melt Flow Rate (MFR)	1 - 30 g/10 min (190°C/2.16 kg)
Ash Content	≤ 0.5 %
Volatile Matter	≤ 0.5 %
Stabilizer Content	As specified per grade

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