An aspect of the present invention provides a refrigerating machine oil containing a mixed base oil of a first hydrocarbon base oil having a kinematic viscosity at 40? C. of less than 6 mm.sup.2/s and a second hydrocarbon base oil having a kinematic viscosity at 40? C. of 6 mm.sup.2/s or more, wherein a (A)/(B) ratio is more than 1 and 1.5 or less, wherein (A) is a kinematic viscosity at 40? C. of the mixed base oil, and (B) is the kinematic viscosity at 40? C. of the first hydrocarbon base oil.

Novel uses of copolymers for removing and/or reducing the level of deposits in the fuel system and/or injection system of direct injection diesel and/or gasoline engines are provided. What is provided is the use of particular copolymers as fuel additive or lubricant additive; to processes for preparation of such additives, and fuels and lubricants added therewith, such as, more particularly, as a detergent additive; to use of these copolymers for reducing the level of or preventing deposits in the fuel systems and especially the injection systems of direct injection diesel engines, especially in common rail injection systems, for reducing the fuel consumption of direct injection diesel engines, especially of diesel engines with common rail injection systems, and for minimizing power loss in direct injection diesel engines, especially in diesel engines with common rail injection systems; and as an additive for gasoline fuels, especially for operation of DISI engines.

Novel uses of copolymers for removing and/or reducing the level of deposits in the fuel system and/or injection system of direct injection diesel and/or gasoline engines are provided. What is provided is the use of particular copolymers as fuel additive or lubricant additive; to processes for preparation of such additives, and fuels and lubricants added therewith, such as, more particularly, as a detergent additive; to use of these copolymers for reducing the level of or preventing deposits in the fuel systems and especially the injection systems of direct injection diesel engines, especially in common rail injection systems, for reducing the fuel consumption of direct injection diesel engines, especially of diesel engines with common rail injection systems, and for minimizing power loss in direct injection diesel engines, especially in diesel engines with common rail injection systems; and as an additive for gasoline fuels, especially for operation of DISI engines.

The present invention relates to novel uses of corrosion inhibitors in fuels and lubricants.

The present invention relates to novel uses of corrosion inhibitors in fuels and lubricants.

An aspect of the present invention provides a refrigerating machine oil containing: a lubricating base oil; a phosphorus-containing additive; and a polymer comprising an unsaturated carboxylic acid ester as a monomer unit.

An aspect of the present invention provides a refrigerating machine oil containing: a lubricating base oil; a phosphorus-containing additive; and a polymer comprising an unsaturated carboxylic acid ester as a monomer unit.

An aqueous solution is provided that includes an alkylated amine having an amine group and present from 6 to 40 total weight percent. A polyacid having carboxylic groups of a C.sub.5-C.sub.14 dicarboxylic acid, a polymeric acid having a plurality of acid groups, or a combination thereof is also present in the solution so as to result in a ratio of acid groups to amine group equivalents of at least 1.8:1. An aqueous solution is also provided in which the alkylated amine is 3-amino-4-octanol. The solutions provided have extended operating lifetimes relative to microbial growth, reduce staining of contacting metal substrates, or both. Some alkylated amines are soluble beyond aqueous solubility limits through the inclusion of the polyacids. A method of metalworking includes exposing a metal substrate to the aqueous solution. Followed by removing or displacing a portion of the metal substrate.

An aqueous solution is provided that includes an alkylated amine having an amine group and present from 6 to 40 total weight percent. A polyacid having carboxylic groups of a C.sub.5-C.sub.14 dicarboxylic acid, a polymeric acid having a plurality of acid groups, or a combination thereof is also present in the solution so as to result in a ratio of acid groups to amine group equivalents of at least 1.8:1. An aqueous solution is also provided in which the alkylated amine is 3-amino-4-octanol. The solutions provided have extended operating lifetimes relative to microbial growth, reduce staining of contacting metal substrates, or both. Some alkylated amines are soluble beyond aqueous solubility limits through the inclusion of the polyacids. A method of metalworking includes exposing a metal substrate to the aqueous solution. Followed by removing or displacing a portion of the metal substrate.

The invention provides lubricating composition comprising: (1) a reaction product selected from the group consisting of: (a) a polyalkanoic or polyalkenoic acid derived from hydroxyfatty acids and a block copolymer selected from the group consisting of polyoxyethylene-polyoxypropylene and a reverse block copolymer of polyoxypropylene-polyoxyethylene-polyoxypropylene; (b) the reaction product of (a) with a maleic acid or anhydride; and (c) the reaction product of (a) with maleated soybean oil; and (2) at least one base oil selected from the group consisting of alkyl benzene, normal paraffin, isoparaffin, mineral oil and -olefin.