OCP viscosity index improver
Time：
2025-11-08
OCP viscosity index improver
OCP stands for Olefin Copolymer, primarily an ethylene-propylene copolymer (EPM), which is currently the most widely used viscosity index improver.
OCP viscosity index improver is prepared by solution polymerization of ethylene and propylene monomers using a soluble Ziegler catalyst.
The ratio of ethylene to propylene determines the product's performance. High ethylene content increases polymer crystallinity, leading to deviations in oil solubility and a tendency to gel at low temperatures. Conversely, high propylene content reduces thickening ability and worsens thermal stability.
Commonly used ethylene-propylene molar ratios are 50:50 or 60:40.
OCP olefin copolymer viscosity index improvers exist in solid or granular rubber form and can be used after dilution with a solvent (usually base oil or mineral oil) in a certain proportion.
Olefin copolymer viscosity index improvers have good thickening ability and good shear stability, and can be used in internal combustion engine oils, especially diesel engine lubricants. However, their low-temperature performance is poor. If high-grade multi-level internal combustion engine oils are to be prepared, they need to be used in conjunction with pour point depressants.
CheMost manufactures and supplies DOCP viscosity index improver. Contact us.
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