Gear oil additive composition and gear oil containing the same

A gear oil composition comprising a major amount of a gear oil base stock containing a sulfur additive complement, a phosphorus additive complement, and a nitrogen additive complement, in proportions such that the composition possesses a weight ratio of sulfur to phosphorus in the range of about 5:1 to about 40:1 and a weight ratio of nitrogen to phosphorus in the range of about 0.05:1 to about 2:1, said base oil additionally containing:

• (i) from about 0.01 to about 5% by weight of at least one oil-soluble succinimide of the formula ##STR17## wherein R.sub.1 is an alkyl or alkenyl group having an average of 8 to 50 carbon atoms, and each of R.sub.2, R.sub.3 and R.sub.4 is, independently, a hydrogen atom or an alkyl or alkenyl group having an average of up to about 4 carbon atoms;
• and
• (ii) from about 0.01 to about 5% by weight of at least one boronated carboxylic derivative composition produced from at least one substituted succinic acylating agent and a reactant selected from the group consisting of (a) amine having at least one primary or secondary amino group in the molecule, (b) at least one alcohol, and (c) a combination of (a) and (b), the components of (c) being reacted with such substituted succinic acylating agent(s) simultaneously or sequentially in any order, wherein such substituted succinic acylating agent(s) has/have a substituent group derived from polyalkene having a number average molecular weight of about 500 to about 100,000;
• said gear oil composition being devoid of any metal-containing additive component.

A gear oil additive composition comprising:

• (i) at least one oil-soluble succinimide of the formula ##STR18## wherein R.sub.1 is an alkyl or alkenyl group having an average of 8 to 50 carbon atoms, and each of R.sub.2, R.sub.3 and R.sub.4 is, independently, a hydrogen atom or an alkyl or alkenyl group having an average of up to about 4 carbon atoms;
• (ii) at least one boronated carboxylic derivative composition produced by reacting at least one substituted succinic acylating agent with a reactant selected from the group consisting of (a) amine having at least one primary or secondary amino group in the molecule, (b) at least one alcohol, and (c) a combination of (a) and (b), the components of (c) being reacted with such substituted succinic acylating agent(s) simultaneously or sequentially in any order, wherein such substituted succinic acylating agent(s) has/have a substituent group derived from polyalkene having a number average molecular weight of about 700 to about 5,000;
• and
• (iii) diluent oil;
• said gear oil additive composition containing on a weight basis from 10 to 80% of component (i), from 10 to 80% of component (ii), and from 10 to 80% of component (iii), the total of (i) and (ii) being in the range of 20 to 90%;
• said gear oil additive composition being devoid of any metal-containing additive component.

A gear oil composition comprising a major amount of a gear oil base stock containing a sulfur additive complement, a phosphorus additive complement, and a nitrogen additive complement, in proportions such that the composition possesses a weight ratio of sulfur to phosphorus in the range of about 5:1 to about 40:1 and a weight ratio of nitrogen to phosphorus in the range of about 0.05:1 to about 2:1, said base oil additionally containing:

• (i) from about 0.01 to about 5% by weight of at least one oil-soluble succinimide of the formula ##STR19## wherein R.sub.1 is an alkyl or alkenyl group having an average of 8 to 50 carbon atoms, and each of R.sub.2, R.sub.3 and R.sub.4 is, independently, a hydrogen atom or an alkyl or alkenyl group having an average of up to about 4 carbon atoms;
• and
• (ii) from about 0.01 to about 5% by weight of at least one boronated carboxylic derivative composition produced by reacting at least one substituted succinic acylating agent with a reactant selected from the group consisting of (a) amine having at least one primary or secondary amino group in the molecule, (b) at least one alcohol, and (c) a combination of (a) and (b), the components of (c) being reacted with such substituted succinic acylating agent(s) simultaneously or sequentially in any order, and reacting the resultant product with a boron compound to form said boronated carboxylic derivative composition, such substituted succinic acylating agent(s) having a substituent group derived from polyalkene having a number average molecular weight of about 700 to about 5,000;
• said gear oil composition being devoid of any metal-containing additive component.

A gear oil composition comprising a base oil having a viscosity in the range of SAE 50 to SAE 250 containing

• (i) from about 0.01 to about 5% by weight of at least one oil-soluble succinimide of the formula ##STR20## wherein R.sub.1 is an alkyl or alkenyl group having an average of 8 to 50 carbon atoms, and each of R.sub.2, R.sub.3 and R.sub.4 is, independently, a hydrogen atom or an alkyl or alkenyl group having an average of up to about 4 carbon atoms;
• and
• (ii) from about 0.01 to about 5% by weight of at least one boronated carboxylic derivative composition produced by reacting at least one substituted succinic acylating agent with a reactant selected from the group consisting of (a) amine having at least one primary or secondary amino group in the molecule, (b) at least one alcohol, and (c) a combination of (a) and (b), the components of (c) being reacted with such substituted succinic acylating agent(s) simultaneously or sequentially in any order, and reacting the resultant product with a boron compound to form said boronated carboxylic derivative composition, such substituted succinic acylating agent(s) having a substituent group derived from polyalkene having a number average molecular weight of about 700 to about 5,000;
• said gear oil composition being devoid of any metal-containing additive component.