Viscosity modifier for lubricating oils, additive composition for lubricating oils, and lubricating oil composition
US10077412B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 27, 2015 |
| Grant date | Sep 18, 2018 |
| Priority date | — |
| Expiry date | Mar 27, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/25
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Provided are a viscosity modifier for lubricating oils for obtaining an additive composition for lubricating oils having excellent fluidity in a wide temperature range from low temperature to high temperature; and said additive composition for lubricating oils. Further provided are a viscosity modifier for lubricating oils for obtaining a lubricating oil composition capable of reducing viscosity in good balance in a wide temperature range from low temperature to high temperature; and said lubricating oil composition. The viscosity modifier for lubricating oils includes an ethylene α-olefin copolymer (A) which includes 30 to 50 mole % of structural units derived from at least one α-olefin selected from α-olefins having 4 and 5 carbon atoms and 50 to 70 mole % of structural units derived from ethylene (with the proviso that the total of all structural units of said copolymer is 100 mole %) and which satisfies specific requirements (a), (b), and (c).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.