as in example i part a no 1 using 30 g na 2 so 4 in the slurry of starch 100 g and a solution of 3 4 g naoh and 5 g na 2 so 4 in 70 g water to adjust the ph the reagent amounts starch base and nitrogen content are shown below ______________________________________ cationic n acetal nstarch base in base acetal reagent in cationic acetal______________________________________waxy corn 0 270 15 d 0 240waxy corn 0 270 12 e 0 360waxy corn 0 270 12 f none corn none 15 g 0 380______________________________________ no nitrogen in acetal reagent this example describes the preparation of cellulose acetals they were prepared using the general procedure of u s pat no 4 129 722 cited previously a total of 20 g span 80 a surfactant available from hercules was dissolved in 200 g isopar e petroleum solvent composed mostly of c 8 isoparaffin b p of 116 u00b0 142 u00b0 c in a 500 ml flask equipped with a thermometer mechanical agitator condenser and suitable size dropping funnels cationic hydroxyethylcellulose 50 g grafted with dimethyldiallylammonium chloride dmdaac was added to the solvent surfactant blend the 15 g of reagent a of example i was dissolved in 10 ml water and added to the reaction mixture over a 30 min period this was followed by addition of 8 ml of 10 n naoh the temperature was raised to 50 u00b0 c and held 3 hrs followed by cooling to room temperature and neutralization.