公开(公告)号：EP4023737A1

公开(公告)日：2022-07-06

申请号：EP20857950.8

申请日：2020-08-26

申请人： Mitsui Chemicals, Inc.

发明人： HAYAKAWA Akio ,  YAMAMOTO Shuhei ,  UDAGAWA Akihiro ,  YAMASHITA Masahiro ,  SAITO Yusuke

IPC分类号： C10N20/02 ,  C10N30/02 ,  C10N40/25 ,  C10M101/02 ,  C10M105/02 ,  C10M107/02 ,  C10M143/08

摘要： The present invention aims to provide a lubricating oil composition having a higher viscosity index (lower temperature dependence of viscosity) and excellent in low-temperature viscosity characteristics. The present invention relates to a lubricating oil composition including a resin (A) and a base oil (B), wherein the resin (A) satisfies the following requirements (A-1) to (A-3), the base oil (B) satisfies the following requirement (B-1), and a content ratio between the resin (A) and the base oil (B) is such that the resin (A) is in a range of 0.01 to 50 parts by mass per 100 parts by mass in total of the resin (A) and the base oil (B). (A-1) the resin (A) is a polymer including a constituent unit derived from 4-methyl-1-pentene in a range of 60 to 99 mol% and a constituent unit derived from an α-olefin having 2 to 20 carbon atoms (excluding 4-methyl-1-pentene) in a range of 1 to 40 mol% (provided that 4-methyl-1-pentene and the α-olefin is 100 mol% in total); (A-2) intrinsic viscosity [η] measured in decalin at 135°C is in a range of 0.01 to 5.0 dl/g; (A-3) a melting point (Tm) is in a range of 110 to 150°C as determined by differential scanning calorimetry (DSC); and (B-1) kinematic viscosity at 100°C is in a range of 1 to 50 mm 2 /s.