665.    DAVEY, W.  Synthetic Lubricants.  Sci. Lubrication, vol. 2, No. 6, 1950, pp. 10-13; Fuel Abs., vol. 8, No. 6, 1950, abs. 4595.

      Polymers of high viscosity index may be prepared by polymerizing C₂H₄, C₃H₆, and C₄H₈ or olefins having more than 8 C atoms in the chain.  One process involves cracking a straight-chain wax for a short time at high temperatures and polymerizing the resultant high proportion of olefins.  The product is largely a steam-cylinder oil.  Moderately viscous oils can also be produced by polymerizing olefins from the 150°-200° Fischer-Tropsch fraction from water gas.  A German process uses the chlorination of a Fischer-Tropsch middle oil to give a 20-25% Cl content and reaction of this product with about half its weight of naphthalene in the presence of naphtha and an AlCl₃ catalyst.  The product yields spindle and turbine oils and a residue of cylinder stock.  CO and H₂ may be added to olefins to give aldehydes, which can be reduced to alcohols and oxidized to acids.  The esters obtained by combining the long-chain alcohols and acids have high viscosity index and low pour point.

     DAVIDSOHN, A.  See abs. 666.