What is Polyisobutylene CAS 9003-27-4?

Polyisobutylene, or PIB, is a synthetic nonpolar hydrocarbon homopolymer produced from isobutylene. CAS 9003-27-4 identifies the polymer type, while commercial grades are further defined by molecular weight, molecular weight distribution and viscosity.

How does molecular weight affect Polyisobutylene?

Low molecular weight PIB grades are typically viscous liquids or tacky semi-solids, while high molecular weight grades are rubber-like solids. Molecular weight controls viscosity, tack, elasticity and suitability for lubricants, adhesives, sealants or polymer modification.

What is the difference between reactive and non-reactive PIB?

Non-reactive PIB has a saturated, nonpolar backbone and remains chemically inert and permanently tacky, making it useful as a tackifier, viscosity modifier or barrier polymer. Reactive PIB contains functional groups for further chemical modification or covalent incorporation into formulated products.

What is Polyisobutylene used for?

PIB is used in lubricant additives, viscosity modifiers, adhesives, sealants, pressure-sensitive adhesive formulations, stretch films and industrial polymer compounds. It is also used in selected personal-care and cosmetic raw material systems.

How should Polyisobutylene be stored and handled?

Store PIB in tightly closed containers in a cool, dry, ventilated area away from strong oxidizers, heat and ignition sources. Follow appropriate spill-control and disposal measures and use suitable personal protective equipment during bulk transfer.

Polyisobutylene CAS 9003-27-4

Polyisobutylene (CAS 9003-27-4) is a chemically inert, synthetic hydrocarbon polymer utilized primarily as a viscosity index improver and tackifier in lubricant formulations and adhesive systems. This viscous PIB liquid functions as a hydrophobic barrier and rheology modifier, providing excellent thermal stability and oxidation resistance in Polyisobutene based sealants and stretch films. Unlike reactive polymers, this Isobutylene polymer remains permanently non-drying and tacky, making it a critical 2-methyl-1-propene homopolymer component for pressure-sensitive adhesives and lubricating oil additives. We provide this polymeric material with competitive factory pricing to support chemical compounding and ensure bulk supply availability for industrial manufacturing. Our facility accommodates customized specifications for molecular weight (low to high) and viscosity grades, while every shipment is fully documented with MSDS, TDS, COA files to meet quality and safety regulations.

CAS: 9003-27-4
Synonyms: PIB, Polyisobutene, Isobutylene polymer, 2-methyl-1-propene homopolymer, Poly(isobutylene)
Einecs: 618-360-8
Molecular Formula: (C₄H₈)ₙ
Grade: Cosmetic Raw Materials
Package: 25 kg kraft bag, 180–200 kg steel drum, or 1,000 kg IBC / bulk

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Product Description

Polyisobutylene (PIB) is a synthetic, long-chain hydrocarbon polymer produced by cationic polymerization of isobutene. It is valued for outstanding tackiness, air/moisture impermeability, chemical stability, and electrical insulation. Depending on molecular weight, PIB ranges from clear, viscous liquids to rubber-like solids, making it a flexible ingredient for many industrial formulations.

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1 Physicochemical Properties

2 Applications

3 Storage Conditions

4 Safety Precautions

Physicochemical Properties

Item	Typical Value / Description
Appearance	Colorless to light-yellow, tacky viscous liquid / semi-solid / rubbery solid (MW-dependent)
Odor	Odorless or very slight hydrocarbon odor
Density (25 °C)	~0.91–0.93 g/mL (typical)
Refractive Index (20 °C)	~1.50–1.51
Glass Transition (Tg)	~ −64 °C (typical for high MW PIB)
Molecular Weight	Variable; low MW (~300–3,000), medium (~10,000–100,000), high MW (≥200,000+)
Viscosity	Strongly MW-dependent; typical product range ~5 to 4,700 cSt @100 °C
Solubility	Insoluble in water; soluble in many non-polar solvents (e.g., aliphatic/aromatic hydrocarbons); limited solubility in polar solvents
Volatility	Very low; non-volatile under ambient conditions
Stability	Chemically stable under normal use; avoid strong oxidizers

Applications

Polyisobutylene is widely used wherever long-term tack, sealing, and barrier performance are needed:

Adhesives & Sealants – pressure-sensitive adhesives, hot-melt systems, construction sealants, self-adhesive tapes, caulking compounds.
Lubricants & Fuel Additives – viscosity-index improver, tackifier, dispersant intermediate (including high-reactive PIB for succinimide dispersants).
Rubber & Tire Industry – inner tubes, tire inner liners, and butyl-rubber modification due to excellent gas impermeability.
Cosmetics & Personal Care – emollient, texture enhancer, film former in lip products, creams, hair care.
Plastics & Bitumen Modification – plasticizer/impact modifier for PE, PP, PVC; improves waterproofing and flexibility in asphalt/bitumen systems.
Electrical & Industrial Uses – insulating compounds, protective coatings, specialty polymer blends.

Storage Conditions

Store in a cool, dry, well-ventilated area
Keep away from open flames, hot surfaces, and strong oxidizing agents.
Recommended storage temperature: ambient; avoid prolonged heating which may increase flow or cause mild degradation.

Safety Precautions

PIB is generally considered low-toxicity and not GHS-classified as hazardous under normal handling.
Avoid contact with hot PIB; molten material can cause thermal burns.
Use standard PPE: safety glasses, protective gloves, and work clothing.
If processing at elevated temperature, ensure local exhaust ventilation to avoid inhaling fumes.
In fire conditions, PIB may generate carbon monoxide and carbon dioxide; use suitable firefighting media and respiratory protection.

FAQ - Technical & Supply Chain

Q:
What is Polyisobutylene CAS 9003-27-4?

A: Polyisobutylene, or PIB, is a synthetic nonpolar hydrocarbon homopolymer produced from isobutylene. CAS 9003-27-4 identifies the polymer type, while commercial grades are further defined by molecular weight, molecular weight distribution and viscosity.
Q:
How does molecular weight affect Polyisobutylene?

A: Low molecular weight PIB grades are typically viscous liquids or tacky semi-solids, while high molecular weight grades are rubber-like solids. Molecular weight controls viscosity, tack, elasticity and suitability for lubricants, adhesives, sealants or polymer modification.
Q:
What is the difference between reactive and non-reactive PIB?

A: Non-reactive PIB has a saturated, nonpolar backbone and remains chemically inert and permanently tacky, making it useful as a tackifier, viscosity modifier or barrier polymer. Reactive PIB contains functional groups for further chemical modification or covalent incorporation into formulated products.
Q:
What is Polyisobutylene used for?

A: PIB is used in lubricant additives, viscosity modifiers, adhesives, sealants, pressure-sensitive adhesive formulations, stretch films and industrial polymer compounds. It is also used in selected personal-care and cosmetic raw material systems.
Q:
How should Polyisobutylene be stored and handled?

A: Store PIB in tightly closed containers in a cool, dry, ventilated area away from strong oxidizers, heat and ignition sources. Follow appropriate spill-control and disposal measures and use suitable personal protective equipment during bulk transfer.

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