公开(公告)号：US10077412B2

公开(公告)日：2018-09-18

申请号：US15127698

申请日：2015-03-27

申请人： MITSUI CHEMICALS, INC. ,  THE LUBRIZOL CORPORATION

发明人： Atsushi Yamamoto ,  Terufumi Suzuki ,  Kenta Ide ,  Chor Huang

IPC分类号： C10M157/00 ,  C10M143/06 ,  C10M145/14

CPC分类号： C10M143/06 ,  C08F210/16 ,  C10M143/08 ,  C10M145/14 ,  C10M2203/1025 ,  C10M2205/022 ,  C10M2205/026 ,  C10M2205/0285 ,  C10M2207/026 ,  C10M2209/084 ,  C10M2215/064 ,  C10M2223/045 ,  C10N2210/01 ,  C10N2210/02 ,  C10N2220/021 ,  C10N2220/022 ,  C10N2220/032 ,  C10N2230/02 ,  C10N2230/54 ,  C10N2230/68 ,  C10N2240/10 ,  C08F210/08 ,  C08F2500/03 ,  C08F2500/17 ,  C08F2500/08 ,  C08F210/06 ,  C10M2205/028

摘要： 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).