Oil-soluble nitrogen containing sulfonated polymers useful as oil additives

A process for improving the viscosity and dispersant properties of a lubricating oil composition which comprises adding a V.I. improver - dispersant oil soluble ionic polymer, having a number average molecular weight in the range of about 5000 to 1,000,000 to said lubricating oil composition at a concentration level of about 0.01 to about 10 weight percent, based on the weight of the total composition, said ionic polymer being formed by sulfonating a C.sub.2 to C.sub.50 aliphatic olefin polymer with a non-chlorine-containing sulfonating agent to a level of about 1 to 60 milliequivalents of SO.sub.3 H groups per 100 grams of sulfonated polymer, and reacting with a neutralizing agent selected from the group consisting of ammonia, ammonium salts and amine.

A process for preparing a V.I. improving - dispersant oil soluble ionic sulfonated polymer useful for a lubricating or fuel oil additive which comprises dissolving an aliphatic C.sub.2 to C.sub.50 olefin polymer having a number average molecular weight in the range of about 5,000 to 1,000,000 in a mineral lubricating oil as solvent to form an oil solution, sulfonating said polymer with a non-chlorine-containing sulfonating agent in said oil solution to introduce sulfonic acid groups, and then neutralizing said sulfonated polymer in said oil solution with a neutralizing agent selected from the group consisting of ammonia, ammonium salts and amines to form said oil additive.

An additive concentrate comprising diluent oil, in the range of about 5 to 45 wt. % of a hydrocarbon soluble V.I. improving - dispersant ionic polymer having a number average molecular weight in the range of 5000 to 1,000,000 formed by sulfonating an aliphatic C.sub.2 to C.sub.50 olefin polymer with a non-chlorine-containing sulfonating agent to a level of about 1 to 60 milliequivalents of SO.sub.3 H groups per 100 grams of sulfonated polymer, said sulfonated polymer being neutralized at least partly with a neutralizng agent selected from the group consisting of ammonia, ammonium salts, and amine;

• and a solubilizing aid for said sulfonated polymer selected from the group consisting of lubricating oil ashless dispersants and oil soluble alkyl hydroxy aromatic sulfides lubricating oil antioxidants.

A crankcase motor oil composition comprising a major amount of mineral lubricating oil, an antioxidant, a zinc dihydrocarbonyl dithiophosphate anti-wear additive, an alkaline earth metal overbased alkylaryl sulfonate, a pour point depressant, and an ashless dispersant, containing as a V.I.-dispersant, an oil soluble V.I. improving-dispersant ionic polymer having a number average molecular weight in the range of about 20,000 to 200,000 formed by sulfonating an aliphatic C.sub.2 to C.sub.50 olefin polymer with a non-chlorine-containing sulfonating agent, said sulfonated polymer having about 1 to 60 milliequivalents of SO.sub.3 H per 100 grams of sulfonated polymer, and then neutralizing at least partly with a neutralizing agent selected from the group consisting of ammonia, ammonium salts and amines.

Oil soluble ionic polymer useful as a V.I. improving-dispersant additive for lubricating oil having a number average molecular weight in the range of about 5,000 to 1,000,000 formed by sulfonating an aliphatic C.sub.2 to C.sub.50 olefin polymer with a non-chlorine-containing sulfonating agent, said sulfonated polymer having about 1 to 60 milliequivalents of SO.sub.3 H groups per 100 grams of sulfonated polymer, and being at least partly neutralized with a neutralizing agent selected from the group consisting of polyamines of 2 to 12 nitrogen atoms and 2 to 60 carbon atoms and hydroxy amines of 1 to 6 hydroxy groups.