Olefin Copolymer (OCP) Viscosity Index Improver
Olefin copolymer (OCP) VI improvers, based on ethylene-propylene copolymers, are the most widely used viscosity modifiers in engine oils and gear oils due to their excellent shear stability and cost-effectiveness. They improve the viscosity-temperature relationship to enable multi-grade formulations and demonstrate outstanding mechanical shear stability in service, making them ideal for heavy-duty diesel engine oils that must retain their viscosity grade through long drain intervals.
Technical Specifications
| appearance | Amber viscous liquid or solid pellets |
| ethylene content | 40–60 mol% |
| flash point (COC) | >200 °C |
| molecular weight (Mw) | 100,000–250,000 Da |
| active content in diluent | 8–12 wt% (solution grade) |
| shear stability index (SSI) | 15–45 |
Applications
- Heavy-duty diesel engine oils (15W-40, 10W-40, 10W-30) requiring shear-stable VI improvement
- Passenger car engine oils (5W-30, 5W-40, 10W-40) as cost-effective viscosity modifier
- Gear oils and axle lubricants (75W-90, 80W-90, 80W-140)
- Industrial transmission oils and multi-purpose tractor fluids (UTTO)
- Construction and off-highway equipment engine oils
Key Features
- Cost-effective high-molecular-weight VI improvement enables economical multi-grade formulations
- Excellent inherent shear stability for sustained viscosity-grade retention over engine life
- Available in solid pellet or oil-dissolved forms to suit different blending operations
- No pour point depressant capability, but readily combined with PMA PPD for full multi-grade performance
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