The invention pertains to certain (per)fluoropolyether triazine derivatives comprising at least one triazine group and at least one fluoropolyoxyalkene chain (chain R.sub.f) comprising a fluorocarbon segment having ether linkages in main chain, said chain R.sub.f comprising at least one hydroxyl group, to a method for their manufacture and to their use in lubrication, in particular for lubricating sliding or moving parts of magnetic recording media.

There is provided an ultraviolet curable resin composition for a self-lubricating liner. The composition includes a first (meth)acrylate compound having an isocyanuric acid ring represented by the following formula (1); a second (meth)acrylate compound different from the first (meth)acrylate compound; a first polytetrafluoroethylene resin with an average particle size in the range of 75 m to 180 m; and a second polytetrafluoroethylene resin with an average particle size in the range of 1 m to 15 m, wherein the total amount of the first polytetrafluoroethylene resin and the second polytetrafluoroethylene resin is in the range of 30% by weight to 50% by weight with respect to the entire amount of the ultraviolet curable resin composition; and the second polytetrafluoroethylene resin is contained in an amount of 20% by weight to 75% by weight with respect to the total amount of the first and second polytetrafluoroethylene resins. ##STR00001##

A bearing element may include an overlay layer which forms a bearing surface against a steel journal or the like. The overlay layer may be formed from a bearing material comprising a polymer matrix of polyamide-imide polymer material, melamine cyanurate particulate, and metal oxide particulate. A method of forming the bearing element comprising the bearing material are also provided.

A bearing element may include an overlay layer which forms a bearing surface against a steel journal or the like. The overlay layer may be formed from a bearing material comprising a polymer matrix of polyamide-imide polymer material, melamine cyanurate particulate, and metal oxide particulate. A method of forming the bearing element comprising the bearing material are also provided.

A grease composition includes a base oil, a thickener, and an additive. The base oil is at least one selected from the group consisting of polyoxyalkylene, ether derivatives of polyoxyalkylene, and mixtures thereof. The additive includes polytetrafluoroethylene as a first solid lubricant and at least one selected from the group consisting of melamine cyanurate, tricalcium phosphate, and sodium sebacate as a second solid lubricant. The content of the second solid lubricant is 0.5% by mass or more based on the total mass of the composition.

A grease composition includes a base oil, a thickener, and an additive. The base oil is at least one selected from the group consisting of polyoxyalkylene, ether derivatives of polyoxyalkylene, and mixtures thereof. The additive includes polytetrafluoroethylene as a first solid lubricant and at least one selected from the group consisting of melamine cyanurate, tricalcium phosphate, and sodium sebacate as a second solid lubricant. The content of the second solid lubricant is 0.5% by mass or more based on the total mass of the composition.

A water-soluble lubricant including a cyclic compound (A) having a ring structure (a) including at least one substructure represented by the following formula (i) or (ii):

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in the above formula, * represents a binding site. The water-soluble lubricant is used in an aqueous metalworking fluid and in a method of metalworking.

A water-soluble lubricant including a cyclic compound (A) having a ring structure (a) including at least one substructure represented by the following formula (i) or (ii):

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in the above formula, * represents a binding site. The water-soluble lubricant is used in an aqueous metalworking fluid and in a method of metalworking.

An agent for forming a solid lubricating coating film on a tightening surface of a thread portion, in which a solid lubricant is dispersed in a binder resin as a matrix component, a main component of the solid lubricant is melamine cyanurate, and an average particle diameter of the melamine cyanurate is 0.1 m or more and 10.0 m or less, the binder resin contains an alkyd resin and nitrocellulose, and the alkyd resin and nitrocellulose are contained in an amount of 85 wt % or more of the total binder resin component weight, and a total weight of the solid lubricant is 10 parts by weight or more and 100 parts by weight or less based on 100 parts by weight of a total weight of the binder resin.

An agent for forming a solid lubricating coating film on a tightening surface of a thread portion, in which a solid lubricant is dispersed in a binder resin as a matrix component, a main component of the solid lubricant is melamine cyanurate, and an average particle diameter of the melamine cyanurate is 0.1 m or more and 10.0 m or less, the binder resin contains an alkyd resin and nitrocellulose, and the alkyd resin and nitrocellulose are contained in an amount of 85 wt % or more of the total binder resin component weight, and a total weight of the solid lubricant is 10 parts by weight or more and 100 parts by weight or less based on 100 parts by weight of a total weight of the binder resin.