Description

Polyisobutylene CAS NO 9003-27-4 is a synthetic polymer derived from the cationic polymerization of isobutylene, characterized by its high molecular weight, excellent chemical stability, and impermeability to gases. This material is valued for its unique combination of tackiness, flexibility, and resistance to oxidation, acids, and alkalis, making it a critical performance additive. It is essential for manufacturers in the adhesives, sealants, lubricants, and elastomer industries seeking to enhance product durability and functionality.

Application

• Adhesive & Sealant Formulations: Used as a primary tackifier and base polymer in pressure-sensitive adhesives (PSAs), butyl sealants, and caulks for construction and automotive applications.
• Lubricant & Fuel Additives: Serves as a viscosity index improver (VII) in engine oils and a detergent dispersant in gasoline and diesel fuels to improve performance and reduce deposits.
• Elastomer & Rubber Manufacturing: A key component in butyl rubber (IIR) for tire inner liners, pharmaceutical stoppers, and vibration dampeners due to its low gas permeability.
• Electrical Insulation: Employed as a moisture-resistant insulating material for cables and electrical components.
• Chewing Gum Base: Acts as an elastomeric component in non-stick, food-grade chewing gum formulations.
• Polymer Modification: Used as a compatibilizer and impact modifier to enhance the properties of plastics like polyethylene and polypropylene.
• Caulks & Putties: Provides permanent flexibility and water resistance in industrial and marine sealants.
• Personal Care Products: Functions as a film-forming agent and binder in cosmetics and personal care items like lip balms and hair styling products.

Basic Information

Product Name	Polyisobutylene
CAS No.	9003-27-4
Molecular Formula	(C4H8)n
Molecular Weight	Varies by grade (Low to High MW)
Synonyms	PIB; Poly(isobutylene); Isobutylene polymer; 2-Methyl-1-propene homopolymer; Butyl rubber (high molecular weight grades); Oppanol® (trade name); Vistanex® (trade name); Indopol® (trade name)
EINECS	202-806-4

Quality Control

Our Polyisobutylene is manufactured under a strict quality management system. Each batch undergoes rigorous testing for key parameters including molecular weight distribution (by GPC), viscosity, and purity to ensure it meets precise customer and industry specifications. Certificates of Analysis (COA) are provided with every shipment, and we can support compliance with relevant standards such as FDA 21 CFR for specific grades.

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). Keep away from strong oxidizing agents and open flames. For long-term storage, an inert atmosphere (nitrogen) is recommended to prevent potential oxidation.

Specification

Item	Specification
Appearance	Colorless to pale yellow viscous liquid or solid
Identification (IR)	Conforms
Viscosity (at 100°C)	Grade-dependent (e.g., 10 - 50,000 cSt)
Molecular Weight (Mn)	Grade-dependent (e.g., 300 - 5,000,000 g/mol)
Volatile Matter	< 0.5%
Ash Content	< 0.1%
Color (Gardner)	< 3

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