Polyisobutenyl Succinic Anhydride (PIBSA)

Name: Polyisobutenyl Succinic Anhydride (PIBSA)
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 28777-98-2

Polyisobutenyl succinic anhydride (PIBSA) is the key intermediate in the synthesis of PIBSI dispersants, produced by the thermal or chlorination-free ene reaction of high-reactivity polyisobutylene with maleic anhydride. It is also used directly as a corrosion inhibitor and emulsifier in metalworking fluids, fuel additives, and specialty lubricants. The anhydride functionality reacts readily with amines, alcohols, and other nucleophiles to produce customized lubricant additive molecules.

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Technical Specifications

appearance	Amber to dark amber viscous liquid
flash point (COC)	>200 °C
saponification number	80–120 mg KOH/g
PIB molecular weight (Mn)	950–2300 Da
unreacted maleic anhydride	<0.1 wt%
kinematic viscosity (100°C)	100–2000 mm²/s

Applications

Synthesis intermediate for PIBSI ashless dispersants in engine oil formulations
Corrosion inhibitor and emulsifier in water-based metalworking fluids
Fuel additive intermediate for gasoline and diesel injector cleanliness additives
Asphalt emulsifier and adhesion promoter in road construction applications
Coupling agent and compatibilizer in specialty polymer and lubricant formulations

Key Features

High-reactivity PIB (HR-PIB) based grades enable chlorine-free manufacturing of PIBSI dispersants
Reactive anhydride group allows versatile downstream chemistry to produce customized additives
Multiple molecular weight grades available (Mn 950–2300) to match dispersant application needs
Low unreacted maleic anhydride content ensures additive product quality and low corrosivity