A lubricant composition of (a) an oil of lubricating viscosity; (b) a dispersant comprising the condensation product of a carboxylic functionalized polymer with an aromatic amine having at least 3 aromatic rings and at least one primary or secondary amino group; and (c) an overbased metal detergent comprising an oil-soluble neutral metal salt component and a metal carbonate component, provides good seal and corrosion performance. Desirably, the total amount of neutral metal salt component in the lubricant composition is at least about 0.75 percent by weight and the sulfated ash level of the lubricant composition is less than about 1.1 percent.

A sliding member includes a substrate, a first coating film layer which is provided on the substrate, and a second coating film layer which is provided on the first coating film layer. The first coating film layer including a coating film including a composition for a sliding member. The composition for a sliding member contains a binder resin, a solid lubricant, and at least one type of resin beads selected from the group consisting of amino resin beads and urethane resin beads. The second coating film layer includes the binder resin and the solid lubricant.

This invention provides a threaded connection for pipes or tubes having excellent misalignment resistance and high torque on shoulder resistance, and also having excellent corrosion resistance properties, as well as a method for producing the threaded connection for pipes or tubes. The threaded connection for pipes or tubes includes a pin and a box. The pin and the box include contact surfaces having threaded portions and unthreaded metal contact portions. The threaded connection for pipes or tubes includes, on at least one of the contact surfaces of the pin and the box, surface roughness, a Zn—Ni alloy plating layer, a Cu—Sn—Zn alloy plating layer and a solid lubricant coating layer. These are deposited from the contact surface side in the order of: surface roughness, the Zn—Ni alloy plating layer, the Cu—Sn—Zn alloy plating layer and the solid lubricant coating layer.

This invention provides a threaded connection for pipes or tubes having excellent misalignment resistance and high torque on shoulder resistance, and also having excellent corrosion resistance properties, as well as a method for producing the threaded connection for pipes or tubes. The threaded connection for pipes or tubes includes a pin and a box. The pin and the box include contact surfaces having threaded portions and unthreaded metal contact portions. The threaded connection for pipes or tubes includes, on at least one of the contact surfaces of the pin and the box, surface roughness, a Zn—Ni alloy plating layer, a Cu—Sn—Zn alloy plating layer and a solid lubricant coating layer. These are deposited from the contact surface side in the order of: surface roughness, the Zn—Ni alloy plating layer, the Cu—Sn—Zn alloy plating layer and the solid lubricant coating layer.

This invention encompasses lubricating oil compositions comprising a base oil, a biodiesel fuel and a Mannich condensation product. A method for inhibiting viscosity increase in a diesel engine fueled at least in part with a biodiesel fuel is also described.

Provided are a non-sulfonated melamine resin viscosity reducer for a drilling fluid and a preparation method thereof. The non-sulfonated melamine resin viscosity reducer for the drilling fluid includes the following raw materials in parts by mass: 100 parts to 150 parts of water, 80 parts to 100 parts of melamine, 20 parts to 30 parts of formaldehyde, 50 parts to 80 parts of a tannin extract, 40 parts to 60 parts of lignin, 20 parts to 40 parts of maleic anhydride, 0.1 parts to 0.3 parts of a catalyst, 1 part to 3 parts of triethanolamine (TEA), and 10 parts to 20 parts of alcoholamine; wherein the alcoholamine is one or more selected from the group consisting of monoethanolamine (MEA), diethanolamine (DEA), diglycolamine (DGA), isopropanolamine (IPA), and diisopropanolamine (DIPA).

Provided are a non-sulfonated melamine resin viscosity reducer for a drilling fluid and a preparation method thereof. The non-sulfonated melamine resin viscosity reducer for the drilling fluid includes the following raw materials in parts by mass: 100 parts to 150 parts of water, 80 parts to 100 parts of melamine, 20 parts to 30 parts of formaldehyde, 50 parts to 80 parts of a tannin extract, 40 parts to 60 parts of lignin, 20 parts to 40 parts of maleic anhydride, 0.1 parts to 0.3 parts of a catalyst, 1 part to 3 parts of triethanolamine (TEA), and 10 parts to 20 parts of alcoholamine; wherein the alcoholamine is one or more selected from the group consisting of monoethanolamine (MEA), diethanolamine (DEA), diglycolamine (DGA), isopropanolamine (IPA), and diisopropanolamine (DIPA).