Synthetic lubricant base stocks by co-reaction of vinylcyclohexene and long-chain olefins

Abstract

Synthetic lubricant base stocks having improved properties are disclosed. The base stocks may be obtained by a two-step process, comprising the steps of (1) co-reacting vinylcyclohexene and long-chain linear olefin with a free-radical initiator; and (2) further reacting the mixture resulting from step (1) in the presence of an acidic montmorillonite clay.

We claim: 
     
       1. A synthetic lubricant base stock, comprising a mixture of (1) oligomers prepared from linear olefins having from 10 to 24 carbon atoms; and (2) a compound selected from the group consisting of compounds having the following formulas: ##STR11## where R is an alkyl or alkenyl group having at least 10 carbon atoms and R 1  is an alkyl group having at least 10 carbon atoms, wherein said mixture is a liquid at room temperature. 
     
     
       2. The synthetic lubricant base stock of claim 1, wherein the oligomers are prepared from linear olefins having from 14 to 18 carbon atoms, R is an alkyl or alkenyl group having at least 14 carbon atoms, and R 1  is an alkyl group having at least 14 carbon atoms. 
     
     
       3. The synthetic lubricant base stock of claim 1, wherein the mixture comprises co-reaction products of linear olefins having from 10 to 24 carbon atoms and vinylcyclohexene. 
     
     
       4. The synthetic lubricant base stock of claim 1, wherein the double bonds of the oligomers have been reduced by catalytic hydrogenation and R is an alkyl group having at least 10 carbon atoms. 
     
     
       5. The synthetic lubricant base stock of claim 1, wherein the mixture comprises co-reaction products of linear olefins having from 14 to 18 carbon atoms and vinylcyclohexene, and wherein the double bonds of the oligomers have been reduced by catalytic hydrogenation and R is an alkyl group having at least 14 carbon atoms. 
     
     
       6. A synthetic lubricant base stock, comprising a mixture of (1) reduced oligomers prepared from linear olefins having from 10 to 24 carbon atoms; and (2) a compound selected from the group consisting of compounds having the following formulas: ##STR12## where R is an alkyl group having at least 10 carbon atoms and R 1  is an alkyl group having at least 10 carbon atoms, wherein said mixture is a liquid at room temperature. 
     
     
       7. The synthetic lubricant base stock of claim 6, wherein the reduced oligomers and catalytically hydrogenated oligomers prepared from linear olefins having from 14 to 18 carbon atoms, R is an alkyl group having at least 14 carbon atoms, and R 1  is an alkyl group having at least 14 carbon atoms. 
     
     
       8. The synthetic lubricant base stock of claim 6, wherein the mixture comprises hydrogenated co-reaction products of linear olefins having from 10 to 24 carbon atoms and vinylcyclohexene. 
     
     
       9. The synthetic lubricant base stock of claim 6, wherein the mixture comprises hydrogenated co-reaction products of linear olefins having from 14 to 18 carbon atoms and vinylcyclohexene; R is an alkyl group having at least 14 carbon atoms; and R 1  is an alkyl group having at least 14 carbon atoms.