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Polyisobutylene succinimide (PIBSI) manufacturer - supplier from china
Pibsi dispersant
Description：
Polyisobutylene succinimide (PIBSI) manufacturer supplier, chemost provides premium ashless dispersants with customizable TBN and nitrogen content for engine oils. Request TDS/MSDS/COA.
Category：
Ashless Dispersants
Product Details
Quick Specs
| Appearance | Brown red viscous liquid |
| TBN | 21.5 mgKOH/g (customizable 15–50) |
| Nitrogen Content | 1.20% (customizable 1.0–5.0%) |
| Molecular Weight (Mn) | 1000–2300, grade-dependent |
| Density at 20°C | 930 kg/m³ |
| Flash Point (PMCC) | ≥205 °C |
| Packaging | 170 kg steel drum / 900 kg IBC tote |
| MOQ | 1 drum (sample) / 1 IBC (bulk) |
| Lead Time | 7–15 days after order confirmation |
What is Polyisobutylene Succinimide?
Polyisobutylene succinimide (PIBSI) is an ashless dispersant. It is one of the five additive types every engine oil formulator works with — alongside detergents, anti-wear additives, antioxidants, and VIIs.
Its job: keep sludge, soot, varnish, and carbon deposits from settling on engine surfaces by holding them suspended in the oil.
How it does this comes down to the molecule's shape. A long polyisobutylene tail dissolves in the base oil. A polar succinimide head grabs onto soot particles, oxidation acids, and resin precursors. Once attached, the dispersant acts as a steric barrier — particles coated with PIBSI can't clump together, so they stay suspended and get drained out at the next oil change. Without working dispersancy, soot particles chain up, viscosity climbs, and the engine grinds itself apart. This is exactly what happens in extended-drain HDEO when the dispersant package exhausts.
Unlike detergents, PIBSI has no metal in it. Burn it and nothing stays behind. That matters because modern engines run DPFs, GPFs, and three-way catalysts — hardware that fouls on sulfated ash. Our process also avoids chlorine. The thermal ene route (HR-PIB + maleic anhydride, >200°C, no catalyst) leaves zero residual organic chlorides in the product.
Polyisobutylene Succinimide Structure
A PIBSI molecule has three parts: a hydrocarbon tail (the polyisobutylene chain), a polar head (the succinimide/amine group), and a connecting bridge (the succinic anhydride link). Tail dissolves in oil. Head grabs contaminants. Bridge holds them together.
The PIB chain runs Mn 500–3000, with 1000–2000 being the workable range for engine oil dispersants. The branching is what keeps things soluble at low temperatures — straight chains would gel. On the other end, the succinimide group supplies basicity and the affinity to latch onto acidic oxidation products, soot, and whatever else the combustion process throws into the crankcase.
Molecular weight distribution matters more than people think. The polydispersity index of commercial PIB — typically 2–3 — means a spread of chain sizes in every batch. Chains too short make dispersants that crash out of solution. Chains too long (Mn 25,000+, as in dispersant viscosity modifiers) sacrifice dispersancy for thickening power. The sweet spot for PIBSI has been settled for decades: Mn 1000–2000, PDI 2–3.
Technical Specifications
| Property | Unit | Typical Value | Test Method |
|---|---|---|---|
| Appearance | — | Brown red viscous liquid | Visual |
| Density at 20°C | kg/m³ | 930 | ASTM D4052 |
| Viscosity at 100°C | mm²/s | 365.5 | ASTM D445 |
| Flash Point (PMCC) | °C | ≥205 | ASTM D93 |
| Total Base Number | mgKOH/g | 21.5 | ASTM D2896 |
| Nitrogen Content | % | 1.20 | ASTM D5762 |
| Water Content | % | ≤0.1 | ASTM D6304 |
| Chlorine Content | ppm | None detected | — |
* All values listed are typical data. Contact our engineering team for batch-specific COA.
Types of Polyisobutylene Succinimide
CheMost manufactures five PIBSI grades covering engine oils, driveline fluids, and fuel applications. Pick based on TBN target, molecular weight, and whether you want boron's anti-wear bonus.
| Grade | Type | TBN | N (%) | MW (Mn) | Boron | Best For |
|---|---|---|---|---|---|---|
| T1351 | Mono-succinimide | 40–50 | 2.0–2.5 | ~1000 | — | PCMO |
| T1428 | Bis-succinimide | 15–25 | 1.0–1.3 | ~1000 | — | PCMO, HDEO |
| T1428B | Boronated bis | 15–25 | 1.0–1.3 | ~1000 | 0.3–0.5% | PCMO, HDEO + AW/AO |
| T1620 | HMW bis | 15–25 | 1.0–1.2 | ~2300 | — | Extended HDEO, marine |
| T1620B | Boronated HMW bis | 15–25 | 1.0–1.2 | ~2300 | 0.3–0.5% | Premium extended drain |
How to choose:
- Need high TBN dispersancy in a compact dose? → T1351 mono-succinimide
- Need balanced dispersancy plus anti-wear from one additive? → T1428B or T1620B (boronated)
- Formulating extended-drain HDEO or marine cylinder oil? → T1620 or T1620B (high MW)
- Formulating driveline fluids (ATF, gear oils, axle lubricants)? → T1428B (boronated, standard MW) or T1620B (boronated, high MW for severe shear)
Can't find the grade you need? We adjust TBN, nitrogen, and molecular weight on request. Contact our formulation support team →
PIBSI Dispersant Features
Chlorine-Free Process
PIBSA intermediate made via thermal ene reaction at >200°C. No chlorine catalyst used, no organic chlorides left behind. The alternative Diels-Alder route runs chlorine gas through the reactor — we don't.
Holds Dispersancy Past 200°C
Ring-zone temperatures kill weak dispersants fast. PIBSI maintains soot and sludge suspension at these temperatures, which is why HMW grades work in extended-drain HDEO where oil temps sit above 200°C for hours.
Leaves No Ash
Zero metal content. Compatible with DPF, GPF, and TWC after-treatment. If your formulation is up against sulfated ash limits, PIBSI doesn't add to the problem.
Works in Crankcase, Driveline, and Fuel
Same chemistry, three product lines. As a crankcase dispersant it handles engine soot. In ATF and gear oils it controls clutch-plate varnish. In fuel, the lower-MW grades keep injectors clean.
TBN and Nitrogen Built to Your Spec
We control the PIBSA:polyamine ratio during amination. Want 1.0% nitrogen? 5.0%? A TBN of 15 or 50? Tell us the target. Polyamine choice (DETA, TETA, TEPA, or custom blends) is part of the equation.
Pumpable at Cold-Cranking Temperatures
The branched PIB backbone keeps the dispersant in solution when the oil is cold. Less low-temperature viscosity contribution means easier cranking and faster oil pressure on startup.
Polyisobutylene Succinimide Synthesis
PIBSI is produced via a two-stage thermal process at our Jinzhou facility.
Stage 1 — PIBSA Formation (Thermal Ene Reaction)
High-reactive polyisobutylene (HR-PIB, Mn 1000–2300, vinylidene content ≥70%) reacts with maleic anhydride at >200°C. The ene reaction produces polyisobutylene succinic anhydride (PIBSA) without chlorine. This is the quality-defining step — vinylidene content of the PIB feedstock directly controls the succinimide yield. Low vinylidene PIB leaves unreacted hydrocarbon that dilutes dispersancy.
Stage 2 — Amination
PIBSA is reacted with polyalkylene polyamines (typically diethylenetriamine, triethylenetetramine, or tetraethylenepentamine) at 130–200°C with continuous water removal. The PIBSA:polyamine molar ratio determines whether the product is primarily mono-succinimide, bis-succinimide, or a mixture. Higher ratios favor bis structures with more bridging between PIBSA units — producing higher molecular weight and different dispersancy characteristics.
Post-Treatment (Boronated Grades Only)
For T154B and T161B, the dispersant is post-treated with boric acid, which reacts with residual amine groups to introduce boron content (0.3–0.5%). This adds antioxidant and anti-wear functionality without compromising dispersancy.
The final product undergoes vacuum stripping to remove free amines and low-molecular-weight species that would otherwise attack fluoroelastomer seals. Filtration ensures a clear, sediment-free liquid.
Applications of Polyisobutylene Succinimide
Passenger Car Motor Oils (PCMO)
The primary dispersant in modern PCMO, typically at 3–6 wt%. It handles low-temperature sludge — the milky "mayonnaise" that forms during stop-and-go driving when combustion water never fully evaporates. In API SP and ILSAC GF-6 formulations, PIBSI works with detergents and ZDDP to hit Sequence VH sludge and varnish limits.
Heavy-Duty Diesel Engine Oils (HDEO)
Soot is the problem in HDEO. PIBSI prevents soot particles from chaining together, which is what causes viscosity climb and abrasive wear. Mack T-8 and T-11 soot-handling results live and die by dispersant quality. Treat rates run 4–7 wt%. For drain intervals past 50,000 km, HMW grades (T161, T161B) are the standard choice.
Driveline Fluids
ATF and gear oils use PIBSI to control sludge and varnish on clutch plates, valve bodies, and oil screens. Boronated grades (T154B) supply the extra anti-wear protection modern ATF specs demand. Treat rate: 1–3 wt%.
Marine Cylinder Oils
Slow-speed marine engines burning HFO (0.5–3.5% sulfur) produce asphaltenic combustion products that few dispersants can handle. HMW PIBSI (T161) keeps these high-MW contaminants suspended between cylinder oil injections. Used at 3–5 wt% alongside high-TBN detergents — typically 70–100 BN calcium sulfonates.
Fuel Additives
Lower-MW PIBSI grades act as detergents in gasoline and diesel fuel packages, keeping injectors and intake valves clean. Polyether-modified variants exist for this application.
PIBSI Driveline Dispersants
PIBSI driveline dispersants are formulated for transmissions, gear sets, and axle lubricants. The operating conditions are different from crankcase applications — higher shear, sustained high temperatures, and tighter clearance between moving parts. The dispersant has to suspend sludge, varnish, and carbon without shearing down under mechanical stress.
Automatic Transmission Fluids (ATF)
Boronated PIBSI (T154B) at 1–3 wt% gives the right balance of dispersancy and anti-wear. The boron pays for itself by reducing the ZDDP load, freeing up phosphorus headroom in the formulation.
Gear Oils & Axle Lubricants
Hypoid gears generate shear rates that tear apart standard-MW dispersant molecules over time. HMW grades (T161, T161B, Mn ~2300) hold up longer. Bis-type structures are preferred over mono here — better thermal stability under extreme-pressure conditions.
CheMost supplies PIBSI driveline dispersants with customizable TBN (15–50 mgKOH/g) and nitrogen (1.0–5.0%). Contact our engineering team for grade recommendations →
Compatibility & Blending
PIBSI is miscible with standard lubricant base oils and compatible with the full additive toolbox:
Detergents
Works with calcium sulfonates, magnesium sulfonates, and calcium phenates. The pair is synergistic — dispersant suspends the junk, detergent neutralizes the acids that create more of it.
ZDDP
No antagonism at standard treat rates (PIBSI 3–6%, ZDDP 0.7–1.2%). Above a 6:1 dispersant-to-ZDDP ratio, some surface competition can show up. Test your formulation if you're running that lean on ZDDP.
Antioxidants
Compatible with hindered phenols, alkylated diphenylamines, and sulfurized olefins. Boronated PIBSI grades chip in extra AO activity.
Base Oils
Readily soluble in API Group I, II, III mineral oils, PAO, and esters. Pre-dilute if you are blending into high-viscosity base oils at low temperatures.
Synonyms & CAS Number
| Common Name | Polyisobutylene succinimide (PIBSI) |
| CAS Number | 84605-20-9 / 68439-80-5 / 72269-41-1 |
| HS Code | 3811.2100.00 |
| Synonyms | PIBSI dispersant, alkenyl succinimide, polyisobutenyl succinimide, ashless dispersant, succinimide dispersant |
| REACH Status | Available on request |
Documentation
| Document | Description | Download |
|---|---|---|
| Technical Data Sheet (TDS) | Complete physical and chemical specifications for PIBSI standard grade | Download PDF |
| Material Safety Data Sheet (MSDS) | Safety, handling, storage, and regulatory classification information | Download PDF |
| Certificate of Analysis (COA) | Batch-specific quality test results — issued per production lot | Request via Email |
Need TDS for a specific grade (T151, T154, T154B, T161, T161B)? Mention the grade when you contact us — we'll send the correct document within 6 hours.
Frequently Asked Questions
Ready to Evaluate PIBSI for Your Formulation?
We ship free 1 kg samples with full TDS and MSDS within 3 working days. Tell us your target application and performance requirements — our engineering team will recommend the right grade and treat rate.
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We believe that as long as we provide high-quality services to our customers, CheMost Additives CO., LTD's products will always gain the trust and support of our customers and have a stable market.
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CheMost Additives CO.,LTD
ADDRESS: CheMost Additives CO.,LTD, Jinzhou city, Liaoning provice, China
