Abstract: The present invention provides an imide composition obtainable by a process which comprises the steps of: (a) reacting a dianhydride with a diamine in the presence of a solvent at a temperature in the range of from 20-80° C., wherein the molar ratio of the dianhydride (A) to the diamine (B) is in the range of from 0.25-4 (A/B), thereby forming an imide precursor; and (b) subjecting at least part of the imide precursor as formed in step (a) in the presence of a solvent to a heat treatment which is carried out at a temperature in the range of from 80-150° C. to convert at least part of the imide precursor into an imide, thereby forming the imide composition.

Abstract: The present invention provides a preservative composition to prevent and/or reduce corrosion on a metal surface comprising an anhydride-derived amide and an oil and/or a solvent, wherein the anhydride-derived amide is present in an amount in the range of from 0.01-50 wt %, based on the total weight of the preservative composition. The invention also provides a preservative composition comprising in addition a sulfonate composition; a metal article having a coating thereon which coating comprises the present preservative composition; and the use of the present preservative composition to prevent and/or reduce corrosion on a metal surface.

Abstract: The present invention provides a preservative composition to prevent and/or reduce corrosion on a metal surface comprising an anhydride-derived amide and an oil and/or a solvent, wherein the anhydride-derived amide is present in an amount in the range of from 0.01-50 wt %, based on the total weight of the preservative composition. The invention also provides a preservative composition comprising in addition a sulfonate composition; a metal article having a coating thereon which coating comprises the present preservative composition; and the use of the present preservative composition to prevent and/or reduce corrosion on a metal surface.

Abstract: A bearing component of a rolling element bearing, such as a rolling element, a bearing ring, and/or a cage for retaining rolling elements of a rolling element bearing, has an outer surface with a plating layer providing at least 97 wt. % tin. The tin of the plating layer provides alpha and beta phases of tin in an alpha/beta phase ratio of less than 10%.

Abstract: An imide composition obtainable by providing (a) reacting a dianhydride with a diamine in the presence of a solvent at a temperature in the range of from 20-80° C. The molar ratio of the dianhydride to the diamine is from 0.25-4, forming an imide precursor; and (b) subjecting the imide precursor as formed in step (a) in the presence of a solvent to a heat treatment carried out at a temperature from 80-150° C. to convert the imide precursor into an imide, thereby forming the imide composition. Also, a preservative composition including the present imide composition; a metal article having a coating that provides the present preservative composition; a process for preparing the imide composition; the use of the present imide composition to prevent and/or reduce false brinelling in a roll bearing system; and the use of the present preservative composition to prevent and/or reduce false brinelling in a roll bearing system.

Abstract: A sulfonate composition obtainable by a process in which a naphthalene ring-containing sulfonic acid is reacted with an amine in the presence of a base oil at a temperature in the range of from 20-80° C. The molar ratio of the sulfonic acid to the amide is in the range of from 0.2-3 (S/A). The invention also provides a preservative composition comprising the present sulfonate composition; a metal article having a coating thereon which coating comprises the present preservative composition; a process for preparing the sulfonate composition; the use of the present sulfonate composition to prevent and/or reduce corrosion in a roll bearing system; and the use of the present preservative composition to prevent and/or reduce corrosion in a roll bearing system.

Abstract: A bearing component of a rolling element bearing, such as a rolling element, a bearing ring, and/or a cage for retaining rolling elements of a rolling element bearing. An outer surface of the bearing component is provided with a plating layer providing at least 97 wt. % tin. According to the invention, tin of the plating layer provides alpha and beta phases of tin in an alpha/beta phase ratio of less than 10%.