Lubricant compositions

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C - Chemistry, Metallurgy

10

M

253/100, 253/104

C10M 135/18 (2006.01) C10M 133/00 (2006.01) C10M 133/52 (2006.01) C10M 141/10 (2006.01) C10M 163/00 (2006.01)

Patent

CA 2035068

Gear oil additive concentrates and lubricant compositions containing a combination of additives which minimize noise and vibration that occasionally develop in limited slip axles. The additive combinations include (i) an oil-soluble succinimide of the formula (see formula I) wherein R1 is alkyl or alkenyl having 8 to 50 carbon atoms, and R2, R3 and R4 are hydrogen atoms or alkyl or alkenyl groups having up to about 4 carbon atoms; and (ii) a boronated or non-boronated carboxylic derivative composition produced by reacting a substituted succinic acylating agent with (a) amine having at least one primary or secondary amino group in the molecule, or (b) at least one alcohol, or (c) a combination of (a) and (b). The substituent of the succinic acylating agent is derived from polyalkene having a number average molecular weight of 500 to 100,000. The additive concentrates and lubricant compositions are devoid of any metal-containing component.

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