Abstract A lubricating oil composition having good shear stability is obtained by blending together a mineral lubricating oil and a viscosity index improving amount of a polymer of a normal alpha olefin having from four to 16 carbon atoms per molecule. The polymer is obtained by polymerizing the alpha olefin or alpha olefin mixture in the liquid phase in the presence of aluminum chloride and a nonpolymerizing hydrocarbon diluent at a temperature between about -40* and +70* F. for a time sufficient to produce a polymer having a viscosity of about 40 to about 3000 centistokes at 210* F. The alpha olefin is introduced into the polymerization system at a rate of about 0.6 to about 60 moles of olefin per mole of aluminum chloride per hour. The addition of the olefin is continued until 2 to 200 moles of olefin per mole of aluminum chloride has been added.
The lubricating composition of claim 1 wherein said minor amount is about 2 to about 30 percent by volume of the composition.
Claim 2
Dependent Claim
16 words
The lubricating composition of claim 1 wherein said olefin utilized in obtaining said polymer is hexene-1.
Claim 3
Dependent Claim
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The lubricating composition of claim 1 wherein said olefin utilized in obtaining said polymer is octene-1.
Claim 4
Dependent Claim
16 words
The lubricating composition of claim 1 wherein said olefin utilized in obtaining said polymer is decene-1.
Claim 5
Dependent Claim
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The lubricating composition of claim 1 wherein said olefin utilized in obtaining said polymer is dodecene-1.
Claim 6
Dependent Claim
16 words
The lubricating composition of claim 1 wherein said olefin utilized in obtaining said polymer is tetradecene-1.
Claim 7
Dependent Claim
16 words
The lubricating composition of claim 1 wherein said olefin utilized in obtaining said polymer is hexadecene-1.
Claim 8
Dependent Claim
33 words
The lubricating composition of claim 1 wherein said olefin utilized in obtaining said polymer is an alpha olefin mixture where the average carbon number of said mixture is about four to about 16.
Claim 9
Dependent Claim
134 words
A lubricating composition comprising a major amount of mineral lubricating oil and a minor amount, sufficient to improve the viscosity index of said oil, of a polymer of decene-1, said polymer being obtained by the process which comprises polymerizing said decene-1 in the liquid phase in the presence of aluminum chloride and butane as a diluent, said decene-1 being introduced into the aluminum chloride-butane reaction mass at a rate of about 2 to about 12 moles of decene-1 per mole of aluminum chloride per hour and in an amount of about 10 to about 100 moles of decene-1 per mole of aluminum chloride, at a temperature of about 25* to about 35* F. for a time sufficient to produce a polymer having a viscosity of about 40 to about 3,000 centistokes at 210* F.