What is polyisobutene (PIB)?

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. Polyisobutylene is produced by catalytic polymerization of a hydrocarbon C4 stream from petrochemical origin, very pure and with a high content of isobutylene and some isoprene. The formula for PIB is: (-CH2-C(CH3)2-)n. A well-controlled process is of great importance to secure a narrow molecular weight distribution. PIB’s are classified by their Molecular Weight (g/mol). Polyisobutene (PIB) is used in, lubricants (two stroke oil & greases), adhesives and sealants, LDPE wrapping films, corrosion protection, cosmetics, rubber, asphalt applications, plastic compounds, electrical insulation in wires & cables and food additives (gum base).

Conventional PIB Grades

Conventional low molecular weights polyisobutene’s (PIB) are liquid polymers, water white, with a wide range of viscosities: chemically stable and resistant to oxidation by light and fluctuating temperatures.

Reactivity grades

Conventional polyisobutene (C-PIB), high reactive polyisobutene (HR-PIB) and enhanced polyisobutene (E-PIB) are used as fuel and oil additives.

PIB in fuel and oil as additive

In lube oil, conventional polyisobutene (C-PIB) and high reactive polyisobutene (HR-PIB) are used as a dispersant in the form of polyisobutenyl succinate and polyisobutenyl succinamide. With the use of detergents, dispersants help minimize smoke or total engine deposits.

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