Copolymer, lubricating oil viscosity modifier, and lubricating oil composition
US7776805B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 2007 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Oct 19, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2030/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A copolymer containing a constituent unit derived from ethylene and a constituent unit derived from an α-olefin having 3 to 20 carbon atoms and satisfying the following requirements (1) to (5): (1) the copolymer has a melting point (Tm) of −20° C. to 100° C.; (2) the melting point (Tm) and the density D (g/cm3) satisfy the following expression Tm≧1073×D−893 (1); (3) the copolymer has a molecular weight distribution (Mw/Mn) measured by GPC of 1.6 to 5.0; (4) the copolymer has a half-width (ΔThalf) of a melting peak measured by DSC of 90° C. or less; and (5) the half-width (ΔThalf) and the melting point (Tm) satisfy the relationship shown by the following expressionΔThalf≦−0.71×Tm+101.4 (2).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.