Lubricant and functional fluid compositions exhibiting improved demulsibility

A lubricating composition comprising a mixture of

• (A) a major amount of an oil of lubricating viscosity,
• (B) from about 0.1 to about 5% by weight of at least one nitrogen- and boron-containing composition prepared by reacting
• (B-1) a boron compound selected from the group consisting of boron trioxide, boron anhydrides, boron halides, boron acids, boron amides, esters of boric acid, and mixtures thereof with
• (B-2) at least one acylated nitrogen intermediate prepared by reacting
• (B-2-a) at least one substituted succinic acylating agent with
• (B-2-b) from about one-half equivalent up to about 2 moles, per equivalent of acylating agent, of at least one polyamine compound characterized by the presence within its structure of at least one >NH group, wherein said substituted succinic acylating agent consists of substituent groups and succinic groups, and the substituent groups are derived from polyalkenes characterized as having an Mn value of from about 700 to about 5000, and
• (C) from about 0.01 to about 0.5% by weight of at least one demulsifier characterized by the formula ##STR17## wherein R is an alkyl or alkenyl group containing from about 9 to about 25 carbon atoms, and R' is hydrogen or an alkyl group containing from 1 to about 6 carbon atoms.

A lubricating composition comprising the mixture of

• (A) a major amount of an oil of lubricating viscosity,
• (B) from about 0.1 to about 5% by weight of at least one nitrogen- and boron-containing composition prepared by reacting
• (B-1) boric acid with
• (B-2) at least one acylated nitrogen intermediate prepared by the reaction of
• (B-2-a) at least one substituted succinic acylating agent with from about one-half equivalent up to about two moles per equivalent of acylating agent, of
• (B-2-b) at least one polyamine characterized by the presence within its structure of at least one >NH group, and wherein said substituted succinic acylating agent consists of substituent groups and succinic groups, the substituent groups are derived from a polyalkene having an Mn value of from about 700 to about 5000, and the amounts of (B-1) and (B-2) are sufficient to provide from about 0.1 atomic proportion of boron for each mole of said acylated nitrogen intermediate up to about 10 atomic proportions of boron for each atomic proportion of nitrogen of said acylated nitrogen intermediate, and
• (C) from about 0.02 to about 0.5% by weight of at least one demulsifier selected from 1-(2-hydroxyethyl)-2-alkenyl imidazolines wherein the alkenyl group contains from about 9 to about 25 carbon atoms.

A concentrate for formulating lubricating oil compositions comprising

• (A) from about 20 to about 90% by weight of a normally liquid, substantially inert organic diluent/solvent,
• (B) from about 0.1 to about 50% by weight of at least one nitrogen- and boron-containing composition prepared by reacting
• (B-1) a boron compound selected from the group consisting of boron trioxide, boron anhydrides, boron halides, boron acids, boron amides, esters of boric acid and mixtures thereof with
• (B-2) at least one acylated nitrogen intermediate prepared by the reaction of
• (B-2-a) at least one substituted succinic acylating agent with
• (B-2-b) at least about one-half equivalent, per equivalent of acylating agent, of an amine characterized by the presence within its structure of at least one >NH group wherein said substituted succinic acylating agent consists of substituent groups and succinic groups, and the substituent groups are derived from polyalkene characterized as having an Mn value of at least about 700, and
• (C) from about 0.01 to about 15% by weight of at least one demulsifier characterized by the formula ##STR19## wherein R is an alkyl or alkenyl group containing from about 5 to about 30 carbon atoms, and R' is hydrogen or a hydrocarbyl group containing from 1 to about 8 carbon atoms.

A thermally stable automotive or industrial gear lubricating composition comprising a mixture of

• (A) a major amount of an oil of lubricating viscosity,
• (B) a dispersant effective amount of at least one ashless dispersant,
• (C) a minor, effective amount of at least one demulsifier characterized by the formula ##STR20## wherein R is a hydrocarbyl group containing about 5 to about 30 carbon atoms and R" is H or a hydrocarbyl group containing from 1 to about 6 carbon atoms, and
• (E) an extreme pressure effective amount of at least one member selected from the group consisting of chlorinated aliphatic hydrocarbons, organic sulfides, organic polysulfides and phosphorus esters.