What is the common name for polyisobutylene? (CAS 9003-27-4)
Common name(s): Isobutene homopolymer. Polyisobutene.
Polyisobutylene, also known as "PIB" or polyisobutene, (C4H8)n, is the homopolymer of isobutylene, or 2-methyl-1-propene, on which butyl rubber is based.
What is polyisobutylene used for?
Polyisobutylene (PIB) finds extensive applications across various industrial and everyday sectors due to its outstanding chemical stability and viscoelastic properties. Specific application areas include:
Lubricant Additives
In the lubricant additives sector, polyisobutylene (CAS 9003-27-4) is commonly used as a thickener to enhance lubricity, control deposits, reduce smoke emissions, and thereby improve anti-wear protection.
It demonstrates exceptional performance in gear oils, two-stroke engine oils, metalworking fluids, and grease formulations, particularly excelling in viscosity regulation and promoting clean combustion.
High-activity PIB plays a critical role in producing polyisobutylene succinimide (PIBSI), an ashless dispersant.
Adhesives and Sealants
Applications in adhesives and sealants account for approximately 13% to 15% of total polyisobutylene (CAS 9003-27-4) consumption. This material is particularly suited for humid environments and conditions requiring water insolubility.
Low-molecular-weight PIB is commonly used as a tackifier or plasticizer, while medium-to-high molecular weight products are employed to regulate material elasticity, elongation, cohesion, and gas barrier properties. PIB-based sealants are renowned for their excellent aging resistance and enduring tack.
Packaging Materials
In packaging applications, PIB serves as an adhesive enhancer for stretch films and adhesive masterbatches, imparting unique viscoelastic properties that deliver robust protective performance.
Polyisobutylene PIB offers excellent peel strength and lap joint integrity, making it indispensable in packaging materials.
Cosmetics and Personal Care Products
Polyisobutylene PIB is highly favored in cosmetics and personal care products. For instance, in lipstick manufacturing, PIB effectively promotes uniform pigment dispersion. In cream-based products, it delivers an exceptional application experience, combining moisturizing, nourishing, and refreshing properties. Its safe, non-irritating characteristics make it suitable for various cosmetics and personal care products that come into direct contact with the skin.