Functionalized olefin copolymers with monoamine terminated polyether and lubricating oil compositions
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United States of America Patent
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Nov 8, 2016
Grant Date -
Feb 25, 2016
app pub date -
Nov 3, 2015
filing date -
Dec 29, 2011
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Abstract
A reaction product, useful as a viscosity index improver in a lubricating oil, reacting: a) an oil soluble ethylene-alpha olefin copolymer comprising from 10 to less than 80 weight % ethylene and greater than 20 up to 90 weight % of at least one C3 to C28 alpha olefin, having a number average molecular weight from 5,000 to 120,000 and grafted with 0.5 to 5 weight % of an ethylenically unsaturated acylating agent, with b) a hydrocarbyl substituted poly(oxyalkylene) monoamine of the formula: R1—(O—CHR2—CHR3)x-A wherein: R1 is a hydrocarbyl group having from 1 to 35 carbon atoms; R2 and R3 are each independently hydrogen, methyl, or ethyl and each R2 and R3 are independently selected in each —O—CHR2—CHR3— unit; A is amino, —CH2amino or N-alkyl amino having 1 to 10 carbon atoms; and x is an integer from 2 to 45.
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