ratio with an aminoalcohol resulting in formation of hydroxyalkylamide functions thus a mixture of about 117 5 grams 0 289 mole of ester functions based on elemental analysis of the styrene n butyl methacrylate about 41 0 grams 0 350 mole of 6 aminohexanol and about 39 3 grams 0 350 mole of 1 4 diazabicyclo 2 2 2 octane was stirred under dry nitrogen at about 180 u00b0 c oil bath temperature 205 u00b0 c using an ambient air cooled condenser to allow escape of the n butanol produced the polymer was aminolyzed to the extent of about 25 mole percent the polymer was purified by dissolving in tetrahydrofuran and then 10 hcl was added the liquid phase was decanted from the gummy polymer this procedure was repeated twice followed by a fourth and fifth wash using 5 methanolic hcl the polymer was taken up in tetrahydrofuran and precipitated by dropwise addition with rapid stirring to 10 hcl after homogenization in a blender and filtration the process was repeated the polymer in tetrahydrofuran solution was then precipitated in like manner from deionized water and this process repeated after a final precipitation from methanol the polymer was dried in vacuo generally the polymer sample was dissolved in about five times its weight of tetrahydrofuran volumes of the precipitating solutions were 6 10 times those of the polymertetrahydrofuran solution films were cast from solutions onto aluminum plates and thoroughly dried the cascade triboelectric charging properties obtained using these films when using 250 micron nickel beads as carrier are given in table i to a stirred solution of about 10 0 grams of the hydroxy polymer of example i in about 30 ml of dry pyridine was added a solution of about 5 0 grams of substituted benzoyl chloride in dry.