Lubricant
AssigneeEthyl Corporation
InventorsRonald L. Shubkin, Ellis B. Rifkin, Martin E. Gluckstein
Life of this patent
Estimating the term…
Abstract
A process for making a low viscosity, low volatility .alpha.-olefin oligomer suitable for use as a functional fluid or lubricating oil comprising dimerizing a C.sub.6-12 .alpha.-olefin, reacting the resultant dimer with a C.sub.6-18 .alpha.-olefin in the presence of a Friedel-Crafts catalyst, distilling out volatile components and hydrogenating the residual product.
Claims26
A process for making an .alpha.-olefin oligomer in a two-stage reaction, said process comprising contacting a first .alpha.-olefin containing about 6-12 carbon atoms or mixture thereof with an alkyl aluminum olefin dimerization catalyst to obtain an initial product consisting mainly of dimers of said first .alpha.-olefin, and then reacting said initial product with a second .alpha.-olefin containing about 6-18 carbon atoms or mixture thereof in the presence of a Friedel-Crafts catalyst to form an oligomer consisting mainly of a graft of said second .alpha.-olefin to said dimers, said first and said second .alpha.-olefins being selected such that two times the average carbon number of said first .alpha.-olefin or mixture thereof plus the average carbon number of said second .alpha.-olefin or mixture thereof is about 26-36, removing said Friedel-Crafts catalyst, distilling out oligomer containing less than about 26 carbon atoms and hydrogenating the remaining oligomer to obtain a hydrogenated olefin oligomer.
An .alpha.-olefin oligomer having a low viscosity and low volatility made by the process comprising contacting a first .alpha.-olefin containing about 6-12 carbon atoms or mixture thereof with an olefin dimerization catalyst to obtain an initial product consisting mainly of dimers of said first .alpha.-olefin, removing any remaining first .alpha.-olefin from said initial product and then reacting said initial product with a second .alpha.-olefin containing about 6-18 carbon atoms or mixture thereof in the presence of a Friedel-Crafts catalyst to form an oligomer consisting mainly of a graft of said second .alpha.-olefin to said dimers, said first and said second .alpha.-olefins being selected such that twice the average carbon number of said first .alpha.-olefin or mixture thereof plus the average carbon number of said second .alpha.-olefin or mixture thereof is about 26-36, removing said Friedel-Crafts catalyst, distilling out oligomer containing less than about 26 carbon atoms and hydrogenating the remaining oligomer to obtain a hydrogenated olefin oligomer.
Dependencies are inferred from the claim text.