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Polymer-Grade Isobutylene: A Critical Monomer for High-Value Fine Chemicals
Isobutylene (2-Methylpropene, CAS: 115-11-7; UN 1055; Hazard Class 2.1 Flammable Gas) is a valuable olefin monomer from the C4 hydrocarbon chain. Two mainstream grades are widely available: 99.5% industrial grade and 99.9% polymer grade. Both can be supplied in 118L LPG-style cylinders with 50kg filling. However, they differ greatly in impurity control, reaction stability, and end-use suitability. Many buyers treat them as identical material, which may lead to polymerization failure, color deviation, and inconsistent product performance.
Isobutylene (2-Methylpropene, CAS: 115-11-7; UN 1055; Hazard Class 2.1 Flammable Gas) is a valuable olefin monomer from the C4 hydrocarbon chain. Two mainstream grades are widely available: 99.5% industrial grade and 99.9% polymer grade. Both can be supplied in 118L LPG-style cylinders with 50kg filling. However, they differ greatly in impurity control, reaction stability, and end-use suitability. Many buyers treat them as identical material, which may lead to polymerization failure, color deviation, and inconsistent product performance.
The 99.5% industrial grade is designed for bulk chemical production. Specifications for butene isomers, moisture, and heavy C4 fractions are relatively loose. It is cost-effective for MTBE, conventional tert-butyl chemicals, general alkylation, and non-polymer-grade rubber chemicals, ideal for processes that tolerate minor by-products.
The 99.9% polymer-grade Isobutylene is engineered for high-end manufacturing. It features tight control over C4 isomers, alkyne, sulfur, water, and methanol traces. Cationic polymerization of isobutylene is highly sensitive to impurities. Even a small amount of isomer impurities can reduce reactivity and broaden molecular weight distribution. Consistent monomer purity is the foundation of premium finished materials.
📊 Grade Comparison
| Item | 99.5% Industrial Grade Isobutylene | 99.9% Polymer Grade Isobutylene |
|---|---|---|
| Purity | ≥99.5% | ≥99.9% |
| Impurity Control | Loose control on butene isomers, moisture & heavy C4 | Strict control on C4 isomers, alkyne, sulfur, water and methanol |
| Key Feature | Cost-effective, tolerant to minor impurities | Low impurity interference, stable cationic polymerization, narrow molecular weight distribution |
| Typical Applications | MTBE, conventional tert-butyl products, general alkylation | HRPIB, pharmaceutical halobutyl rubber, aerospace seals, pharma intermediates, optical MMA, photoresist precursors |
| Target Buyers | Bulk chemical manufacturers | Fine chemical, pharma, new energy & advanced material producers |
| Package | 118L / 50kg cylinder | 118L / 50kg cylinder |
Key high-end applications of 99.9% polymer-grade Isobutylene
✅ High-reactivity polyisobutylene (HRPIB): EV lubricant modifiers, fuel detergents, sealants, hot melt adhesives, and cable insulation. High purity supports narrow molecular weight distribution and high reactivity.
✅ Pharmaceutical & aerospace halobutyl rubber: vaccine stoppers, medical seals, energy storage, and aerospace airtight components, where stable vulcanization and gas tightness are critical.
✅ Pharma intermediates, vitamin & fragrance synthesis: tert-butyl protecting groups, ibuprofen, cephalosporin side chains, vitamin A, linalool, and citronellal.
✅ High-end hindered phenol antioxidants (BHT): for food-contact plastics and lithium battery materials, avoiding discoloration and unwanted by-products.
✅ High-purity MMA for optical PMMA; TBMA and related photoresist precursors: optical light guides, lenses, coating curing agents, and agrochemical intermediates.
Packaging & supply
Chengdu Xenon Tritium Technology offers Isobutylene in 118L LPG-style cylinders, 50kg filling. Valve options: QF-2 / CGA510. Full export documentation is available (MSDS, COA, and DG declaration).
Note: Isobutylene is a low-pressure liquefied flammable gas, heavier than air. Fire and static protection must be guaranteed during storage, handling, and shipment.
Grade selection should be based on your process, not only price. For polymerization, pharma materials, aerospace seals, and HRPIB production, 99.9% polymer grade is recommended. For MTBE and simple alkylation, 99.5% industrial grade brings better economy.
Contact us for grade consultation, sample support, and compliance documents.
Supplier: Chengdu Xenon Tritium Technology Co., Ltd.
