Polyisobutylene [MW 1,350]

Polyisobutylene [MW 1,350]

Polyisobutylene (PIB) [MW ~1,350] is a low molecular weight, viscous hydrocarbon polymer widely used as a tackifier, plasticizer, viscosity modifier, and barrier additive in industrial formulations. Its chemical inertness, hydrophobicity, and flexibility make it useful in adhesives, sealants, coatings, lubricants, and specialty polymer systems.

This low molecular weight grade provides good flow behavior and tack while maintaining excellent resistance to moisture, oxidation, and many chemical environments. Polyisobutylene is commonly incorporated into pressure-sensitive adhesives, protective coatings, lubricant formulations, and polymer blends where flexibility and cohesive performance are important.

Key Features & Benefits

• Low molecular weight PIB: provides tack, flexibility, and viscosity modification
• Excellent hydrophobicity: helps improve moisture and water resistance
• Chemically inert polymer: resistant to oxidation and many reactive environments
• Useful in adhesive systems: supports tack, cohesion, and flexibility in formulated products
• Compatible with industrial formulations: used in coatings, lubricants, sealants, and polymer blends

Product Details

• Product name: Polyisobutylene [MW 1,350]
• Polymer type: Hydrocarbon polymer
• Molecular weight: Approximately 1,350
• Physical form: Viscous polymer
• Applications: Adhesives, sealants, lubricants, coatings, and polymer modification

Typical Applications

Adhesives & tackifiers
Polyisobutylene is widely used in pressure-sensitive adhesives and tackifier systems where flexibility, tack, and cohesive strength are required.

Sealants & caulks
Used as a rheology modifier and flexible binder component in industrial sealants and moisture-resistant formulations.

Lubricants & viscosity modifiers
Low molecular weight PIB can function as a viscosity modifier and additive component in lubricant and oil-based formulations.

Protective coatings
Incorporated into specialty coatings and films to improve moisture resistance, flexibility, and barrier performance.

Functional Properties

Polyisobutylene is valued for its combination of hydrophobicity, flexibility, tackiness, and chemical stability. Its saturated hydrocarbon structure contributes to resistance against oxidation and environmental degradation while maintaining soft, pliable performance.

Lower molecular weight PIB grades such as MW ~1,350 are commonly selected when formulators need improved flow characteristics, tack, and easier blending into coatings, adhesive systems, or polymer matrices.

Why Use Low Molecular Weight Polyisobutylene?

Low molecular weight polyisobutylene grades are frequently used when formulators require a balance of viscosity control, adhesion performance, and hydrophobic barrier properties. Compared with higher molecular weight PIB materials, this grade offers easier processing and improved flow behavior in many industrial systems.

Because of its flexibility and inert character, polyisobutylene is commonly used in formulations exposed to moisture, environmental stress, or chemical contact where long-term stability is important.

Handling & Storage

• Store in a cool, dry area away from excessive heat.
• Keep containers tightly sealed when not in use.
• Avoid contamination during formulation and handling.
• Use appropriate personal protective equipment.
• Consult the SDS for detailed handling and safety information.

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