The invention relates to a copolymer and a substrate having a surface, at least one part of which is coated with an epilame agent comprising at least one compound in the form of a copolymer comprising V units, N units, optionally at least one M unit, and optionally at least one P unit, linked by covalent bonds by their main chains, wherein

##STR00001## wherein W, X, Y, Z are spacer arms, T is a tracer group arranged to determine the concentration of epilame agent in an epilame-coating bath, L is a halogenated, preferably fluorinated, C.sub.1-C.sub.20 carbon moiety, A is a substrate anchoring moiety, Q is H, CH.sub.3, or a hydrocarbon chain different from T.

The invention also concerns a method for coating such a substrate with epilame, said method comprising a step of checking the concentration of epilame agent in the epilame-coating bath by means of the tracer group and if necessary, a step of readjusting the concentration of epilame agent in the epilame-coating bath.

Compositions have a high content of saturated or unsaturated isoparaffinic hydrocarbons with 12-24 carbon atoms and a polyalkyl (meth)acrylate. A method prepares said compositions to promote the raise of the flash point of hydraulic fluids where a good low temperature flow is important, e.g. compressor oils, shock absorber fluids, power steering fluids, and central hydraulic fluids.

A tubular threaded joint is constituted by a pin and a box each having a contact surface comprising an unthreaded metal contact portion including a seal portion and a shoulder portion and a threaded portion. Of the contact surface of at least one of the pin and the box, the surfaces of the seal portion and the shoulder portion has a first lubricating coating in the form of a solid lubricating coating, and the surface of the threaded portion or the entire surface of the contact surface has a second lubricating coating selected from a viscous liquid lubricating coating and a solid lubricating coating. The first lubricating coating has a coefficient of friction which is higher than that of the second lubricating coating, and the second lubricating coating is positioned on top in a portion where both the first lubricating coating and the second lubricating coating are present.

A galvanized steel sheet to be subjected to complicated and difficult press forming is provided. A method for producing such a galvanized steel sheet is also provided. On a surface of a galvanized steel sheet having a metallic zinc layer with a coating weight of 5 g/m.sup.2 or more, a film is formed that contains 10 mass % or more of a polyolefin wax having a melting point of 120 C. or above and 140 C. or below and an average particle size of 3.0 m or less, and at least one organic resin selected from acrylic resins, epoxy resins, urethane resins, phenolic resins, vinyl acetate resins, and polyester resins, in such a way that the coating weight W (g/m.sup.2) of the film per side and the arithmetic average roughness Ra (m) of the surface of the metallic zinc layer satisfy a relationship of W0.12Ra.sup.2+0.1.

A steel sheet having a lubrication film that is to be subjected to complex forming in which press forming is difficult, and a method for manufacturing the steel sheet, are disclosed. The steel sheet has an organic resin coating film which has an indentation reduced Young's modulus of 20 GPa or higher and 50 GPa or lower and an indentation hardness of 0.5 GPa or higher and 1.5 GPa or lower or which has an indentation reduced Young's modulus of 10 GPa or higher and less than 20 GPa and an indentation hardness of 0.2 GPa or higher and 0.5 GPa or lower and which has a coating weight per side of 0.2 g/m.sup.2 or more and 2.0 g/m.sup.2 or less on a surface thereof.

Coatings for medical devices having selectable levels of durability and lubricity are disclosed. The coatings include polymeric material components, the characteristics and relative amounts of which can be selected to provide target levels of durability and lubricity. Methods of making the coatings for medical devices are also disclosed.

A threaded tubular component configured for drilling or working hydrocarbon wells, the tubular component including, at one of its ends, a threaded zone formed on its external or internal peripheral surface depending on whether the threaded end is male or female in type. The end portion is at least partially coated with a dry film, including a thermoplastic or thermoset matrix including microcapsules filled with compounds in liquid form.

The present invention relates to a transmission lubricant comprising at least 30% by weight of polyalkyl (meth)acrylate. The present invention further describes polyalkyl (meth)acrylates for use in lubricants and also processes for preparing them and their use. The present lubricants can be used particularly in wind turbine transmissions.

The present invention provides an acrylate-based copolymer obtained by polymerizing constituent monomers including a polymerizable monomer (a) consisting of an alkyl acrylate-based monomer represented by the following general formula (1) in an amount of from 10 mol % to 95 mol % with respect to a total number of moles of the constituent monomers, a polymerizable monomer (b) consisting of an alkylene glycol acrylate-based monomer represented by the following general formula (2) in an amount of from 5 mol % to 50 mol % with respect to the total number of moles of the constituent monomers, and at least one kind of polymerizable monomer (c) selected from the group consisting of an aromatic vinyl-based monomer (c-1) and a short-chain alkyl acrylate-based monomer (c-2) represented by the following general formula (3) in an amount of from 0 mol % to 60 mol % with respect to the total number of moles of the constituent monomers. In the formula (1), R.sup.1 represents an alkyl group having 4 to 18 carbon atoms, and A.sup.1 represents a hydrogen atom. In the formula (2), R.sup.2 represents an alkylene group having 2 to 4 carbon atoms, R.sup.3 represents a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, A.sup.2 represents a hydrogen atom, and n represents a number from 2 to 20. In the formula (3), R.sup.4 represents an alkyl group having 1 to 3 carbon atoms, and A.sup.3 represents a hydrogen atom. ##STR00001##

The present invention relates to a method for preparing a polymer composition, said method comprising the steps of: a) preparing a reaction mixture comprising as component A) an ethylenically unsaturated monomer or a mixture of ethylenically unsaturated monomers and as component B) a 1-alkene or a mixture of 1-alkenes; b) adding a Co(II) complex as a catalytic chain transfer agent to the reaction mixture; c) adding a radical initiator; and d) reacting the reaction mixture to obtain the polymer composition, wherein the total amount of the radical initiator added to the reaction mixture is at least 0.05% by weight relative to the total weight of components A) and B). The present invention also relates to the use of a Co(II) complex as catalytic chain transfer agent for the polymerization of a reaction mixture comprising an ethylenically unsaturated monomer or a mixture of ethylenically unsaturated monomers, a radical initiator, and a 1-alkene or a mixture of 1-alkenes, wherein the total amount of the radical initiator added to the reaction mixture is at least 0.05% by weight relative to the total weight of the ethylenically unsaturated monomer or mixture of ethylenically unsaturated monomers and the 1-alkene or mixture of 1-alkenes.