Patent ID: 8435931
Filing Date: 2013-05-07
Classification: B82Y,C10M,C10N

Abstract:
1. A method for reducing the friction of a lubricating oil comprising a base stock or base oil by dissolving in the base stock or base oil from 10 ppm to 10 wt % of a functionalized carbon nanostructure material which functionalized carbon nanostructure material is made by a process comprising: (1) suspending a carbon nanostructure material in a chlorinated benzene solvent; and (2) adding to the suspension of (1), in at least 2 additions over a reaction time ranging from 2 days to 4 days between each addition, materials of the formula: wherein R 1 and R 2 are the same or different hydrogen or C 1 to C 18 alkyl groups provided at least one of R 1 and R 2 is not hydrogen, y is 0 to 10, Z is 0 or 1, n and m are integers ranging from 0 to 2 provided n+m is at least 1, R 3 is a C 1 to C 15 alkyl or C 6 to C 10 aryl group, R 4 is a C 2 to C 14 alkyl group, C 6 to C 10 aryl, C 1 to C 10 alkylaryl or C 1 to C 10 arylalkyl group, and x is an integer ranging from 0 to up to the replaceable valence of the R 3 group, and 1,8-diazabicyclo[5.4.0]undecene (DBU), wherein the resulting functionalized carbon nanostructure material has at least twice the level of functionalization as compared to functionalized carbon nanostructure material made using the same carbon nanostructure material and material of formula I or II and DBU when the materials of formula I or II and DBU are added to the carbon nanostructure material all at once in a single addition.