automotive lubricating oil based formulation, method for increasing the viscosity index of a hydrocarbon based oil and method for lubricating an automotive mechanical device

摘要

an automotive lubricating oil based formulation contains a base oil, preferably hydrocarbon, with a kinematic viscosity of 100 centistokes or less at 40 degrees celsius and an alkyl-coated oil-soluble polymer in which the alkyl-coated oil-soluble polymer has the structure of formula 0): r1 is an alkyl of one to thirty carbons, r2 and r3 are independently selected from the three- or four-carbon alkyl groups and may be in block or randomly combined form, r4 is one to one alkyl 18 carbon atoms, nor are independent numbers ranging from zero to 20, as long as n + m is greater than zero and p is a number within a range of one to three and a kinematic viscosity of 100 centistokes or less at 40 degrees celsius. It is useful in a lubricant for mechanical devices.