. . . . "A process in accordance with claim 1 wherein R1 alkyl contains from about 4 to about 60 carbon atoms, R1 aryl contains from about 6 to about 60 carbon atoms; R2 alkyl contains from about 1 to about 60 carbon atoms, R2 aryl contains from about 6 to about 60 carbon atoms; R3 alkyl contains from 1 to about 6 carbon atoms; and m is a number of from about 2 to about 500." .