Product Details
Product Description of Polyisobutylene CAS#9003-27-4
Polyisobutylene (PIB) is a non-toxic, water-white viscous liquid, featuring excellent low-temperature flexibility owing to its low glass transition temperature. As a linear saturated polymer with a highly flexible molecular structure, it exhibits outstanding extensibility and elasticity. PIB also possesses superior chemical stability and can be customized for various applications by adjusting its molecular weight. Its viscosity ranges from 5 to 4,700 cSt at 100°C depending on molecular weight, with higher values resulting in increased tackiness.
Physical Properties:
Form: Liquid or semi-solid, depending on molecular weight
Color: Water-white to pale yellow
Odor: Slight characteristic odor or odorless
Viscosity: Dependent on molecular weight; generally 5 to 4,700 cSt at 100°C
Density: Approximately 0.92 g/mL at 25°C
Solubility: Soluble in hydrocarbons, aromatics, gasoline, cycloalkanes, mineral oil, chlorinated hydrocarbons and carbon disulfide; partially soluble in higher alcohols and esters; insoluble in water, lower alcohols (methanol, ethanol, isopropanol), ethylene glycol, ketones such as acetone, and glacial acetic acid
Polyisobutylene Chemical Properties
| Melting point | 54-56 °C |
| Boiling point | 300 °C |
| Density | 0.92 g/mL at 25 °C (lit.) |
| Tg | -61 |
| Tg | -62 |
| Tg | -64 |
| Tg | -75 |
| Refractive index | n20/D 1.51 |
| Fp | >212 |
| Fp | >482 |
| Form | slab/chunk |
| Stability | Stability Combustible. Incompatible with strong oxidizing agents. |
| InChI | InChI=1S/C4H8/c1-4(2)3/h1H2,2-3H3 |
| InChIKey | VQTUBCCKSQIDNK-UHFFFAOYSA-N |
| SMILES | C=C(C)C |
| EPA Substance Registry System | Polyisobutylene (9003-27-4) |
Applications
- Lubricants: Used in two-stroke engine oils, gear oils, greases, hydraulic fluids and metalworking fluids
- Adhesives: Applied in pressure-sensitive adhesive (PSA) and hot-melt adhesive (HMA) formulations
- Sealants: Suitable for automotive, tire and window sealants
- Stretch Film: Improves tear resistance and can be used in food-contact films
- Electrical Insulation: Provides hydrophobic, non-conductive and non-oxidizing insulation
- Cosmetics and Foods: Used in gum base grades due to its non-toxic nature
Key Advantages
- High tackiness with excellent viscosity properties
- Outstanding resistance to corrosion, oxidation, heat, chemicals and UV radiation
- Fully hydrophobic with very low electrical conductivity
- Excellent storage stability, with no risk of drying, evaporation or solidification
- Polyisobutylene is a versatile polymer widely used in various industries due to its high performance, durability and adaptability to diverse environmental conditions.
