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US4666619A Ethylene polymer useful as a lubricating oil viscosity modifier E-25 失效
用作润滑油粘度调节剂E-25的乙烯聚合物

Ethylene polymer useful as a lubricating oil viscosity modifier E-25
摘要:
An ethylene ter- or tetrapolymer useful as a viscosity modifer and a process for preparing the polymer. The polymer comprises ethylene, an alpha-olefin, a non-conjugated diene and, optionally, a cationically polymerizable monoolefin. The polymerization catalyst comprises a Ziegler catalyst in conjunction with a cationic polymerization catalyst.
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