1-octene/1-decene copolymer and lubricating-oil composition containing same

Abstract

Provided are an α-olefin copolymer useful as a high-viscosity lubricant oil excellent in viscosity characteristics, low-temperature characteristics and oxidation stability, and a lubricant oil containing the copolymer. The α-olefin copolymer is a 1-octene/1-decene copolymer produced by the use of a doubly bridged metallocene catalyst.

1 . A copolymer, comprising:
 a 1-octene unit, and   a 1-decene unit,   wherein the copolymer is produced in the presence of a doubly bridged metallocene catalyst.   
     
     
         2 . The copolymer according to  claim 1 , wherein a proportion of molecules which comprise a 2,1-insertion terminal is 30 mol % or greater. 
     
     
         3 . The copolymer according to  claim 1 , wherein a molar ratio of the 1-octene unit to the 1-decene unit is from 20/80 to 85/15. 
     
     
         4 . The copolymer according to  claim 1 , wherein the copolymer has:
 a mesotriad fraction (mm), as measured through  13 C-NMR, of from 25 to 50 mol %, and   a dynamic viscosity at 100° C. of from 30 to 1000 mm 2 /s.   
     
     
         5 . The copolymer according to  claim 1 , wherein the copolymer has a number-average molecular weight Mn, as measured through GPC, of from 1500 to 15000. 
     
     
         6 . The copolymer according to  claim 1 , wherein the copolymer has a weight-average molecular weight Mw of from 2100 to 30000. 
     
     
         7 . The copolymer according to  claim 1 , wherein the copolymer has a molecular weight distribution Mw/Mn of 3.0 or smaller. 
     
     
         8 . The copolymer according to  claim 1 , wherein a double bond amount after hydrogenation relative to a total monomer units, as measured through  1 H-NMR, is 0.3 mol % or smaller. 
     
     
         9 . A lubricant oil composition, comprising at least one of the copolymer according to  claim 1  and a hydrogenated 1-octene/1-decene copolymer prepared through hydrogenation of the copolymer. 
     
     
         10 . The copolymer according to  claim 2 , wherein a molar ratio of the 1-octene unit to the 1-decene unit is from 20/80 to 85/15. 
     
     
         11 . The copolymer according to  claim 2 , wherein the copolymer has:
 a mesotriad fraction (mm), as measured through  13 C-NMR, of from 25 to 50 mol %, and   a dynamic viscosity at 100° C. of from 30 to 1000 mm 2 /s.   
     
     
         12 . The copolymer according to  claim 3 , wherein the copolymer has:
 a mesotriad fraction (mm), as measured through  13 C-NMR, of from 25 to 50 mol %, and   a dynamic viscosity at 100° C. of from 30 to 1000 mm 2 /s.   
     
     
         13 . The copolymer according to  claim 2 , wherein the copolymer has a number-average molecular weight Mn, as measured through GPC, of from 1500 to 15000. 
     
     
         14 . The copolymer according to  claim 3 , wherein the copolymer has a number-average molecular weight Mn, as measured through GPC, of from 1500 to 15000. 
     
     
         15 . The copolymer according to  claim 4 , wherein the copolymer has a number-average molecular weight Mn, as measured through GPC, of from 1500 to 15000. 
     
     
         16 . The copolymer according to  claim 2 , wherein the copolymer has a weight-average molecular weight Mw of from 2100 to 30000. 
     
     
         17 . The copolymer according to  claim 3 , wherein the copolymer has a weight-average molecular weight Mw of from 2100 to 30000. 
     
     
         18 . The copolymer according to  claim 4 , wherein the copolymer has a weight-average molecular weight Mw of from 2100 to 30000. 
     
     
         19 . The copolymer according to  claim 5 , wherein the copolymer has a weight-average molecular weight Mw of from 2100 to 30000. 
     
     
         20 . The copolymer according to  claim 2 , wherein a double bond amount after hydrogenation relative to a total monomer units, as measured through  1 H-NMR, is 0.3 mol % or smaller.