Disclosed herein is a sliding member for an internal-combustion engine of an automobile or the like. The sliding member has excellent sliding properties due to high oleophilicity of its sliding surface achieved by adjusting the surface texture of a resin layer forming the sliding surface, which makes it possible to effectively prevent wear or seizure of the sliding member and a counterpart sliding member thereof. The sliding member includes a resin layer provided on a surface of a base material, in which the resin layer has a surface roughness of 1.05 or more, preferably 1.07 or more. The mean spacing (s) between local peaks of the resin layer may be in the range of 2 m or more but 12 m or less, but may be preferably in the range of 2 m or more but 10 m or less. Further, the mean height (Rc) of the resin layer may be in the range of 0.5 m or more but 5.0 m or less, but may be preferably in the range of 0.5 m or more but 3.0 m or less.

The invention relates to an imide polymer-based solid film lubricant, a method for producing same, a sliding element comprising same and the use thereof. According to the method, difunctional or cyclized difunctional compounds and optionally functional fillers are added to a non-imidized or partly imidized polyamide acid prepolymer or an imidized short-chain blocked prepolymer in a solvent or solvent mixture and then, depending on the prepolymer, a polymerization reaction or an imidization reaction and in both cases a crosslinking reaction is carried out. The solid film lubricant comprises an imide polymer as the resin matrix and optionally functional fillers, the molecules of the imide polymer comprising groups (R.sub.1) of the difunctional compounds that additionally contribute to the crosslinking.

The object of the present invention is to provide a foreign substance removing lubricant composition having high foreign substance removing effects and being capable of improving the lubricating properties as compared to conventional lubricant compositions, a foreign substance removing lubricant composition applied member, and a method for using the foreign substance removing lubricant composition. The foreign substance removing lubricant composition of the present invention comprises a perfluoroalkyl group containing compound (S) having a perfluoroalkyl group or a fluoropolyether containing compound. As a result, foreign substance removing effects can be enhanced, and the lubricating properties can be improved as compared to the conventional lubricant compositions.

A lubricating grease composition containing a base oil having a kinematic viscosity of 10 mm.sup.2/s or more and 60 mm.sup.2/s or less at 40 C.; a thickener containing at least one soap selected from a metal soap and a metal complex soap; and a solid lubricant containing porous polyamide particles. An amount of the porous polyamide particles blended is 1% by mass or more and 20% by mass or less based on a total mass of the lubricating grease composition.

A sliding member of the present embodiment includes a bearing alloy layer and a coating layer provided on a sliding surface side thereof. The coating layer has a resin binder with sulfide particles dispersed therein. A covering portion is provided over specific particles and is made of metal oxide comprising the same metal element as a metal element constituting the sulfide particles. When measured by an X-ray photoelectron spectroscopy and an X-ray diffraction method, a ratio of a peak height of the metal oxide to a peak height of metal sulfide by the X-ray photoelectron spectroscopy is from 0.10 to 0.50, and a ratio of the peak height of the metal oxide to the peak height of the metal sulfide by the X-ray diffraction method is 0.10 or less.

A sulfur- and phosphorus-free extreme pressure lubricant and a preparation method thereof is disclosed. The lubricant is prepared by using Turkey red oil, a cyclic anhydride compound, triethanolamine, nano polytetrafluoroethylene powder, an alcohol compound, and water as raw materials. The lubricant does not contain hazardous substances such as sulfur and phosphorus. This reduces the harm to the environment, equipment, and human body, and conforms to the development trend of modern industrial production. Moreover, the lubricant has excellent extreme pressure performance, and can effectively reduce the downhole friction and torque, thereby meeting the construction requirements of extended reach wells and horizontal wells.

An air bag coated with a cured organopolysiloxane composition, characterized in that the air bag is top coated with an antifriction coating comprising at least one solid lubricant dispersed in an organic polymer binder.

A polyamide resin molded body is formed by a resin composition having a (B) fluorine series resin within a range from 1 to 15 parts by mass with respect to 100 parts by mass of a (A) polyamide resin. In the resin composition, the number average particle diameter of the fluorine series resin dispersed in the polyamide resin is 0.8 m or less. The resin composition includes particles of the (B) fluorine series resin having particle diameters of 0.8 m or greater. The percentage of particles having particle diameters of 0.8 m or greater which are secondary particles while maintaining the form of primary particles is 60% or greater, and/or the degree of crystallinity of the dispersed (B) fluorine series resin is 42 J/g or greater.

A polyamide resin molded body is formed by a resin composition having a (B) fluorine series resin within a range from 1 to 15 parts by mass with respect to 100 parts by mass of a (A) polyamide resin. In the resin composition, the number average particle diameter of the fluorine series resin dispersed in the polyamide resin is 0.8 m or less. The resin composition includes particles of the (B) fluorine series resin having particle diameters of 0.8 m or greater. The percentage of particles having particle diameters of 0.8 m or greater which are secondary particles while maintaining the form of primary particles is 60% or greater, and/or the degree of crystallinity of the dispersed (B) fluorine series resin is 42 J/g or greater.

A resin composition for use in a sliding member, which has higher seizing resistance while maintaining abrasion resistance. The sliding resin composition includes: a resin binder; a solid lubricant; and a protecting and reinforcing agent that is harder and brittler than the resin binder. As the protecting and reinforcing agent, aggregates of particles harder than the resin binder are used. The amount of the protecting and reinforcing agent contained is 1 vol. % or more but 20 vol. % or less of the entire sliding resin composition. The particles harder than the resin binder have an average particle diameter of 10 nm or more but 100 nm or less that is smaller than that of the solid lubricant.