The purpose of the present invention is to provide a lubricating oil composition capable of achieving good wear resistance and good scoring resistance of a bearing in addition to further fuel saving while maintaining durability and seizure resistance that can be used as a gear oil for a high-output, high-speed gear mechanism. A lubricating oil composition containing a combination of Fischer-Tropsch derived base oil having a low kinematic viscosity at high temperature, polyalphaolefin having a high kinematic viscosity at high temperature, and ester compound of a trivalent or higher polyol having a low kinematic viscosity at high temperature, and further contains a partial ester compound of an unsaturated fatty acid and a polyol, including a monoester compound of the unsaturated fatty acid and the polyol.

A lubricant oil composition for automotive gears includes a lubricant base oil including a mineral oil having a kinematic viscosity at 100 C. of 2.0 to 6.5 mm.sup.2/s, a viscosity index of not less than 105 and a pour point of not more than 10 C., and/or a synthetic oil having a kinematic viscosity at 100 C. of 1.0 to 6.5 mm.sup.2/s, a viscosity index of not less than 120 and a pour point of not more than 30 C.; and an ethylene/-olefin copolymer having an ethylene content of 55 to 85 mol %, a kinematic viscosity at 100 C. of 10 to 200 mm.sup.2/s, a molecular weight distribution of not more than 2.2, and a melting point in the range of 30 C. to 60 C. The lubricant oil composition for automotive gears has a kinematic viscosity at 100 C. of 4.0 to 9.0 mm.sup.2/s.

Disclosed herein is a method of pretreatment of a metallic substrate for a subsequent metal cold forming process. The method includes at least steps (1) and (2), namely providing at least one substrate having at least one surface at least partially made of at least one metal (step (1)), contacting the at least one surface of the substrate provided in step (1) with an aqueous lubricant composition (B) (step (2)), where the aqueous lubricant composition (B) includes besides water at least constituents (b1) to (b4) and optionally (b5).

Further disclosed herein are a pretreated metallic substrate obtained by the method, a method of cold forming of a metallic substrate, and an aqueous lubricant composition (B).

Disclosed herein is a method of pretreatment of a metallic substrate for a subsequent metal cold forming process. The method includes at least steps (1) and (2), namely providing at least one substrate having at least one surface at least partially made of at least one metal (step (1)), contacting the at least one surface of the substrate provided in step (1) with an aqueous lubricant composition (B) (step (2)), where the aqueous lubricant composition (B) includes besides water at least constituents (b1) to (b4) and optionally (b5).

Further disclosed herein are a pretreated metallic substrate obtained by the method, a method of cold forming of a metallic substrate, and an aqueous lubricant composition (B).

The invention has an object of providing ethylene/-olefin copolymers having high randomness and a small number of double bonds in the copolymers. The ethylene/-olefin copolymers of the invention are obtained by copolymerizing ethylene and an -olefin having 3 to 20 carbon atoms in the presence of an olefin polymerization catalyst which includes a bridged metallocene compound (A) represented by the formula [I], and at least one compound (B) selected from organometallic compounds (B-1), organoaluminum oxy compounds (B-2) and compounds (B-3) capable of reacting with the bridged metallocene compound (A) to form an ion pair, and have a specific weight average molecular weight, a specific molecular weight distribution, a specific glass transition point and a specific value B. ##STR00001##

The invention has an object of providing ethylene/-olefin copolymers having high randomness and a small number of double bonds in the copolymers. The ethylene/-olefin copolymers of the invention are obtained by copolymerizing ethylene and an -olefin having 3 to 20 carbon atoms in the presence of an olefin polymerization catalyst which includes a bridged metallocene compound (A) represented by the formula [I], and at least one compound (B) selected from organometallic compounds (B-1), organoaluminum oxy compounds (B-2) and compounds (B-3) capable of reacting with the bridged metallocene compound (A) to form an ion pair, and have a specific weight average molecular weight, a specific molecular weight distribution, a specific glass transition point and a specific value B. ##STR00001##

A lubricant composition includes a lubricant base oil (A) having a kinematic viscosity at 100 C. of 1 to 10 mm.sup.2/s, and an ethylene/-olefin copolymer (B) in which (B1) the peak top molecular weight is 3,000 to 10,000, (B2) the copolymer shows no melting peak, (B3) the value B is not less than 1.1 and (B4) the kinematic viscosity at 100 C. is 140 to 500 mm.sup.2/s. The lubricant composition has a kinematic viscosity at 100 C. of not more than 20 mm.sup.2/s, a peak top of molecular weight in the range of 3,000 to 10,000, and a weight fraction of components having a molecular weight not less than 20,000 of 1 to 10% relative to all components having a molecular weight not less than the molecular weight that gives the peak top.

A lubricant composition includes a lubricant base oil (A) having a kinematic viscosity at 100 C. of 1 to 10 mm.sup.2/s, and an ethylene/-olefin copolymer (B) in which (B1) the peak top molecular weight is 3,000 to 10,000, (B2) the copolymer shows no melting peak, (B3) the value B is not less than 1.1 and (B4) the kinematic viscosity at 100 C. is 140 to 500 mm.sup.2/s. The lubricant composition has a kinematic viscosity at 100 C. of not more than 20 mm.sup.2/s, a peak top of molecular weight in the range of 3,000 to 10,000, and a weight fraction of components having a molecular weight not less than 20,000 of 1 to 10% relative to all components having a molecular weight not less than the molecular weight that gives the peak top.

A lubricant composition comprising one or several poly-alpha olefin homopolymer(s), a suspension of particles having a size between 0.5 m and 25 m and an additive, and uses thereof in the glass industry, such as in the production of hollow glasses for the packaging of products to be applied on mammals.

A lubricant composition comprising one or several poly-alpha olefin homopolymer(s), a suspension of particles having a size between 0.5 m and 25 m and an additive, and uses thereof in the glass industry, such as in the production of hollow glasses for the packaging of products to be applied on mammals.