Patent GB-952151-A (GB)
Title: Lubricating oil compositions
IPC: C08F8/32
Filed: 1962-08-15
Abstract: Compounds of the formula: <FORM:0952151/C2/1> where each R is a C20-500 polyalkenyl radical, each R1 is a C1-8 alkylene radical, x and y are zero or integers, and z is an integer, are prepared by reacting a C20-500 polyolefin with maleic anhydride to form a mono(polyalkenyl) succinic anhydride, and subsequently reacting this product in a mole ratio of from 2:1 to 4:1 with an amine having the formula: H2N-[(R1)x-NH]y-(R1)z-NH2 where R1, x, y and z are as defined above.  If the mono(polyalkenyl) succinic anhydride is reacted in a mole ratio of from 1:10 to 2:1 with the above amine, or with such an amine in which one of the terminal amino groups is substituted by one or two C1-5 alkyl radicals, a product may be obtained which is an amino-amide, full or partial amide, or amine salt of a mono(polyalkenyl) succinic acid.  The type of product obtained depends on the reactants and reaction conditions.ALSO:Compounds of the formula: <FORM:0952151/C3/1> where each R is a C20- 500 polyalkenyl radical, each R1 is a C1- 8 alkylene radical, x and y are zero or integers, and z is an integer, are prepared by reacting a C20- 500 polyolefin with maleic anhydride to form a mono(polyalkenyl) succinic anhydride, and subsequently reacting this product in a mole ratio of from 2:1 to 4:1 with an amine having the formula: <FORM:0952151/C3/2> where R1, x, y and z are as defined above. The polyolefine may be polyethylene, polypropylene, polybutylene polyisobutylene, or a copolymer of ethylene with propylene, isobutylene or a -methylstyrene. If the mono(polyalkenyl) succinic anhydride is reacted in a mole ratio of from 1:10 to 2:1 with the above amine, or with such an amine in which one of the terminal amino groups is substituted by one or two C1- 5 alkyl radicals, a product may be obtained which is an aminoamide, full or partial amide, or amine salt of a mono(polyalkenyl) succinic acid.  The type of product obtained depends on the reactants and reaction conditions.ALSO:A lubricating oil composition comprises a major proportion of a lubricating oil and minor proportions of (a) an oil-soluble di-imide of a mono(polyhydrocarbon) succinic acid or anhydride and (b) an oil-soluble bisphenol.  Additive (a) preferably is of the formula <FORM:0952151/C3/1) where each R is a C20-500 polycycloalkyl, poly-alkyl or polyalkenyl radical, each R1 is a C1-8 alkylene radical, x and y are zero or integers and z is an integer. Additive (b) preferably is of the formula <FORM:0952151/C3/2> where R1 is a hydrocarbon radical, preferably alkyl, m is an integer from 1 to 4, X represents -S-, -S-S-, -Se-, -S-CH2-, -CH2-S-CH2-, -CH2-O-CH2-, -CHR-, -CR2-, -(CH2)n-, NH or -O-, R being methyl or ethyl and n being 1, 2 or 3.  Optionally there may be present minor proportions of (c) an oil-soluble amino-imide, or full or partial amide, or amine salt of a mono-(polyhydrocarbon succinic acid or anhydride, and/or (d) metal-free organic phosphorus compounds, e.g. phosphites, phosphonates (which may contain chlorine), phosphates, the corresponding thio-derivatives, and P2S5-terpene reaction products.  Additives (a) to (d) are extensively exemplified.  Further optional additives mentioned include silicone polymers, polymeric acrylic esters, dibenzyl sulphide, the condensation products of maleic anhydride and long-chain olefins, acidless tallow, and peroxidized aromatic extracts. Lubricating oils which may be used are various mineral oils, hydrocarbon lubricants derived from coal products, alkylene polymers, alkylene oxide-type polymers, dicarboxylic acid esters, liquid esters of phosphoric acids, alkyl benzenes, polyphenyls, alkyl biphenyl ethers, silicic acid esters, and polysiloxanes, examples of such oils being given.