The invention concerns a threaded portion of a tubular element for a threaded tubular connection having an axis of revolution, the portion comprising a threading extending over its outer or inner peripheral surface, and a first sealing surface on the peripheral surface, the first sealing surface being capable of producing metal-metal interference with a corresponding second sealing surface belonging to a complementary threaded portion. The threading and the first sealing surface are coated with a metallic anti-galling layer wherein zinc (Zn) is the major element by weight, the metallic anti-galling layer being at least partially coated with a lubricant layer comprising a resin and a dry solid lubricant powder dispersed in the resin.

Provided is a refrigerating machine oil composition for a refrigerant consisting of difluoromethane, the composition comprising a polymer (A) below and an ester (B) of polyhydric alcohol(s) with aliphatic monocarboxylic acid(s).

The polymer (A): a polymer which is obtained by polymerizing monomer(s) consisting of at least one monomer of monosubstituted ethylenes and disubstituted ethylenes, and in which a ratio of a monomer represented by the following general formula (I):

##STR00001##

wherein R.sup.1 represents an alkyl group having 1 to 5 carbon atoms, R.sup.2 represents hydrogen or an alkyl group having 1 to 4 carbon atoms, and the sum of carbon numbers in R.sup.1 and R.sup.2 is 2 to 5, is 75 to 100% by mass based on a total mass of monomers constituting the polymer.

Provided is a refrigerating machine oil composition for a refrigerant consisting of difluoromethane, the composition comprising a polymer (A) below and an ester (B) of polyhydric alcohol(s) with aliphatic monocarboxylic acid(s).

The polymer (A): a polymer which is obtained by polymerizing monomer(s) consisting of at least one monomer of monosubstituted ethylenes and disubstituted ethylenes, and in which a ratio of a monomer represented by the following general formula (I):

##STR00001##

wherein R.sup.1 represents an alkyl group having 1 to 5 carbon atoms, R.sup.2 represents hydrogen or an alkyl group having 1 to 4 carbon atoms, and the sum of carbon numbers in R.sup.1 and R.sup.2 is 2 to 5, is 75 to 100% by mass based on a total mass of monomers constituting the polymer.

Provided is a refrigerating machine oil composition for a mixed refrigerant comprising difluoromethane, the composition comprising a polymer (A) below and an ester (B) of polyhydric alcohol(s) with aliphatic monocarboxylic acid(s).

The polymer (A): a polymer which is obtained by polymerizing monomer(s) consisting of at least one monomer of monosubstituted ethylenes and disubstituted ethylenes, and in which a ratio of a monomer represented by the following general formula (I):

##STR00001##

wherein R.sup.1 represents an alkyl group having 1 to 14 carbon atoms, R.sup.2 represents hydrogen or an alkyl group having 1 to 4 carbon atoms, and the sum of carbon numbers in R.sup.1 and R.sup.2 is 2 to 14, is 75 to 100% by mass based on a total mass of monomers constituting the polymer.

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 surface protection composition contains (a) a phosphorus compound represented by formula (1), ##STR00001## wherein R.sup.1 represents a hydrogen atom, R.sup.2 represents a hydrocarbon group having 4 to 30 carbon atoms, and R.sup.3 represents a hydrogen atom or a hydrocarbon group having 4 to 30 carbon atoms, (b-1) a metal-containing compound or (b-2) an amine compound, (c) a (meth)acrylate having a hydrocarbon chain having 4 or more carbon atoms, (d-1) an acylphosphine oxide photopolymerization initiator and (d-2) an ?-aminoacetophenone photopolymerization initiator, wherein the composition has the compound (d-1) in an amount of 0.1 to 3.0 mass % with respect to the total amount of the composition, compound (d-2) in an amount of 0.1 to 3.0 mass % with respect to the total amount of the composition and a total amount of the compound (d-I) and (d-2) is less than 5.0 mass % with respect to the total amount of the composition.

A liquid crystalline resin composition including a liquid crystalline resin, an olefin-based copolymer, a micro filler having an average particle diameter (D50) of 3 ?m or less, and a carbon-based filler, wherein a content of the micro filler is 6 to 20 wt % based on a total weight of the liquid crystalline resin composition, and an aspect ratio of the micro filler is 6 or less, and wherein a content of the olefin-based copolymer is 3 to 10 wt % based on the total weight of the liquid crystalline resin composition.

A method of making a coating solution includes the steps of polymerising an initial monomer feed comprising an N-vinyl pyrrolidone and an acrylate, preferably methacrylate, salt in water to synthesise a copolymer thereof, acidifying the resulting copolymer-water mixture to give free carboxylic acid groups along the copolymer backbone, diluting the aqueous solution down with alcohol, and adding a cross-linking agent which is capable of reacting with the carboxylic acid groups and curing the copolymer at a later stage after the coating solution has been applied to a substrate and the copolymer coated thereon. Also disclosed are a coating solution in storage, a method of coating a substrate which is on, or is part of, a medical device or other article, a substrate, article or medical device having a coating so applied, and a coated medical device packaged in a hydration solution. The aqueous-alcoholic coating solution may be stored for an extended period, suitably for at least one month and desirably for substantially longer, without deteriorating.

A method of making a coating solution includes the steps of polymerising an initial monomer feed comprising an N-vinyl pyrrolidone and an acrylate, preferably methacrylate, salt in water to synthesise a copolymer thereof, acidifying the resulting copolymer-water mixture to give free carboxylic acid groups along the copolymer backbone, diluting the aqueous solution down with alcohol, and adding a cross-linking agent which is capable of reacting with the carboxylic acid groups and curing the copolymer at a later stage after the coating solution has been applied to a substrate and the copolymer coated thereon. Also disclosed are a coating solution in storage, a method of coating a substrate which is on, or is part of, a medical device or other article, a substrate, article or medical device having a coating so applied, and a coated medical device packaged in a hydration solution. The aqueous-alcoholic coating solution may be stored for an extended period, suitably for at least one month and desirably for substantially longer, without deteriorating.

An entry sheet for drilling comprising: a metallic foil; and a layer of a resin composition on at least one surface of the metallic foil, the resin composition comprising a polyolefin resin (A) and a water-soluble resin (B), wherein a content of the polyolefin resin (A) is 25 parts by mass or more and 50 parts by mass or less based on 100 parts by mass of the total of the polyolefin resin (A) and the water-soluble resin (B), a content of the water-soluble resin (B) is 50 parts by mass or more and 75 parts by mass or less based on 100 parts by mass of the total of the polyolefin resin (A) and the water-soluble resin (B), and the water-soluble resin (B) comprises a high-molecular-weight water-soluble resin (B-1) having a weight average molecular weight of 210.sup.5 or higher and 1.510.sup.6 or lower.