COMPOSITION CONTAINING A BLOCK COPOLYMER AND A METHOD OF LUBRICATING AN INTERNAL COMBUSTION ENGINE

摘要

The invention provides a lubricating composition containing an oil of lubricating viscosity and a block copolymer. The block copolymer may contain (a) a hydrophobic first block having C1_30 alkyl (meth)acrylic units, wherein at least 50 wt % of the C1 _30 alkyl (meth)acrylic units are C 12-15 alkyl (meth)acrylic units, and up to 50 wt % of the C1_30 alkyl (meth)acrylic units are C 16-20 alkyl (meth)acrylic units, with the proviso that alkyl groups of the C1 _30 alkyl (meth)acrylic units have an average total number of carbon atoms of at least 8; and (b) a second block having (meth)acrylic units further having a heteroatom-containing group providing a polar group. The invention further relates to a method of lubricating an internal combustion engine by lubricating the engine with the lubricating composition. The invention further relates to the use of the block copolymer as an emulsifier and/or pour point depressant.