摘要:
A lubricant of (a) an oil of lubricating viscosity; (b) a block copolymer of (i) a hydrophobic first block of C1-30 alkyl (meth)acrylic units having an average total number of carbon atoms of at least 8; and (ii) a second block of (meth)acrylic units, at least some units of which comprise a heteroatom imparting polar character to the block; (c) an overbased calcium detergent; (d) a phosphorus-containing anti-wear agent that does not contribute to the metal content of the lubricant; and (e) a friction modifier suitable to reduce the static coefficient of friction at a metal-composition interface, is suitable for lubricating a farm tractor.
摘要:
A lubricant of (a) an oil of lubricating viscosity; (b) a block copolymer of (i) a hydrophobic first block of C1-30 alkyl (meth)acrylic units having an average total number of carbon atoms of at least 8; and (ii) a second block of (meth)acrylic units, at least some units of which comprise a heteroatom imparting polar character to the block; (c) an overbased calcium detergent; (d) a phosphorus-containing anti-wear agent that does not contribute to the metal content of the lubricant; and (e) a friction modifier suitable to reduce the static coefficient of friction at a metal-composition interface, is suitable for lubricating a farm tractor.
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 C12-15 alkyl (meth)acrylic units, and up to 50 wt % of the C1-30 alkyl (meth)acrylic units are C16 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.
摘要:
A lubricating composition contains an oil of lubricating viscosity and 0.5 to 10 percent by weight of a poly (meth)acrylate viscosity modifier polymer comprising (i) 15 weight percent to 35 weight percent monomer units of methyl (meth) acrylate, (ii) 0 to 10 weight percent monomer units of one or more C2-C6 alkyl (meth)acrylates, (iii) 50 to 85 weight percent monomer units of one or more C8-C30 alkyl (meth)acrylates, and (iv) 0 to 10 weight percent monomer units of one or more nitrogen-containing monomers. Such a lubricating composition exhibits a high viscosity index and may impart improved fuel economy to an internal combustion engine.
摘要:
A lubricant composition suitable for lubricating an internal combustion engine comprises: (a) an oil of lubricating viscosity having a viscosity index of at least 105 and a kinematic viscosity at 100 C of less than 7 mm2s-1; (b) 0.01 to 2 weight percent of a friction modifier represented by the structure [I]; (c) 0.5 to 4 weight percent of a poly(meth)acrylate viscosity modifier polymer; (d) 0 to 500 parts per million by weight of molybdenum in the form of an oil-soluble molybdenum compound; and (e) 0 to 200 parts per million by weight of boron in the form of an oil-soluble boron compound.
摘要:
A lubricant composition suitable for lubricating an internal combustion engine comprises: (a) an oil of lubricating viscosity having a viscosity index of at least 105 and a kinematic viscosity at 100 C of less than 7 mm2s-1; (b) 0.01 to 2 weight percent of a friction modifier represented by the structure [I]; (c) 0.5 to 4 weight percent of a poly(meth)acrylate viscosity modifier polymer; (d) 0 to 500 parts per million by weight of molybdenum in the form of an oil-soluble molybdenum compound; and (e) 0 to 200 parts per million by weight of boron in the form of an oil-soluble boron compound.
摘要:
The present invention relates to a lubricating composition containing an oil of lubricating viscosity and a star polymer that has at least two inner blocks, at least one of which is in turn bonded to one or more outer blocks. The invention further relates to methods of lubricating a mechanical device with the lubricating composition.
摘要:
The present invention relates to a lubricating composition containing an oil of lubricating viscosity and a star polymer that has at least two inner blocks, at least one of which is in turn bonded to one or more outer blocks. The invention further relates to methods of lubricating a mechanical device with the lubricating composition.
摘要:
A lubricating composition contains an oil of lubricating viscosity and 0.5 to 10 percent by weight of a poly(meth)acrylate viscosity modifier polymer comprising (i) 15 weight percent to 35 weight percent monomer units of methyl(meth)acrylate, (ii) 0 to 10 weight percent monomer units of one or more C2-C6 alkyl(meth)acrylates, (iii) 50 to 85 weight percent monomer units of one or more C8-C30 alkyl(meth)acrylates, and (iv) 0 to 10 weight percent monomer units of one or more nitrogen-containing monomers. Such a lubricating composition exhibits a high viscosity index and may impart improved fuel economy to an internal combustion engine.
摘要:
Shape memory main-chain smectic-C elastomers are described. The elastomers are prepared by hydrosilylation of a reaction mixture including a liquid crystalline diene, a crosslinking agent, and a bis(silyl hydride) compound. The elastomers exhibit shape-memory properties and spontaneously reversible shape changes. They are useful for fabrication of shape memory articles including, for example, implantable medical devices, contact lenses, reversible embossing media, and Fresnel lenses.