Patent ID: 6231659
Filing Date: 2001-05-15
Classification: C07C,D21H

Abstract:
A mixture of alkenyl succinic anhydrides in which the alkenyl groups have in the range of about 6 to about 40 carbon atoms, and in which at least 97 wt % of the alkenyl groups are bifurcated on the alpha carbon atom into two branches neither of which has less than two carbon atoms, said mixture being further characterized in that:A) from about 20 to about 50% of the alkenyl succinic anhydrides that are bifurcated on the alpha carbon atom, have only one methyl or methylene group thereon, and the remainder of the alkenyl succinic anhydrides that are bifurcated on the alpha carbon atom have two straight chain branches emanating from the alpha carbon atom;B) the alkenyl succinic anhydrides present in said mixture are composed of at least 3 alkenyl succinic anhydrides that differ from each other in the number of carbon atoms in the respective alkenyl groups, each of said at least 3 alkenyl succinic anhydrides being present in said mixture in an amount of at least 5 wt % based on the total weight of said mixture of alkenyl succinic anhydrides;C) the alkenyl succinic anhydrides present in said mixture contain no more than about 50 wt % based on the total weight of said alkenyl succinic anhydrides, of any specific alkenyl succinic anhydride;D) the alkenyl succinic anhydrides present in said mixture contain no more than about 50 wt % based on the total weight of said alkenyl succinic anhydrides, of any two or more alkenyl succinic anhydride isomers having the same number of carbon atoms in their alkenyl groups;E) the alkenyl succinic anhydrides present in said mixture are proportioned such that the average number of carbon atoms in the alkenyl groups thereof is in the range of about 16 to about 22 carbon atoms per molecule; andF) said mixture of alkenyl succinic anhydrides has a viscosity at 25.degree. C. in the range of about 80 to about 220 centistokes.