Copolymer, lubricating oil viscosity modifier, and...

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 210/02 (2006.01) C10M 143/00 (2006.01) C10M 143/04 (2006.01)

Patent

CA 2666807

Disclosed are: a lubricating oil composition having excellent low-temperature properties; a lubricating oil viscosity modifier which is intended to be contained in the lubricating oil composition; and a specific copolymer which constitutes the lubricating oil viscosity modifier. Specifically disclosed is a copolymer which has a constituent unit derived from ethylene and a constituent unit derived from an .alpha.-olefin having 3 to 20 carbon atoms and meets the following requirements (1) to (5): (1) Tm lies within the range from -20 to 100ºC; (2) Tm and the density (D) (g/cm3) have the relationship represented by the formula (1); (3) Mw/Mn as measured by GPC lies within the range from 1.6 to 5.0; (4) the half-width value (.DELTA.Thalf) of the melting peak as measured by DSC is 90ºC or lower; and (5) .DELTA.Thalf and Tm have the relationship represented by the formula (2). Tm >= 1073 x D - 893 (1) .DELTA.Thalf <= -0.71 x Tm + 101.4 (2)

L'invention concerne : une composition d'huile lubrifiante présentant d'excellentes propriétés à basse température; un modificateur de viscosité d'huile lubrifiante, destiné à être contenu dans la composition d'huile lubrifiante; et un copolymère spécifique qui constitue le modificateur de viscosité d'huile lubrifiante. L'invention concerne spécifiquement un copolymère comportant une unité constitutive dérivée d'éthylène et une unité constitutive dérivée d'une .alpha.-oléfine ayant de 3 à 20 atomes de carbone et satisfaisant aux exigences (1) à (5) suivantes : (1) Tm est compris entre -20 et 100 ºC; (2) Tm et la densité (D) (g/cm3) ont la relation représentée par la formule (1); (3) Mw/Mn tel que mesuré par CPG est compris entre 1,6 et 5,0; (4) la valeur à la demi-largeur (.DELTA.Thalf) du pic de fusion, mesuré par DSC, est inférieure ou égale à 90 ºC; et (5) .DELTA.Thalf et Tm ont la relation représentée par la formule (2). Tm >= 1073 x D - 893 (1) .DELTA.Thalf <= -0.71 x Tm + 101.4 (2)

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