used in place of the mixture of monomers of example 7 the product is a tan syrup which dissolves readily in water the polymer product of example 13 is diluted to 0 1 solids with water and is added with gentle stirring to aliquots of laboratory stock aqueous suspensions as follows in each instance the solution is added in amount sufficient to provide 50 parts of the polymer per million parts by weight of the suspension to be clarified in each instance rapid and substantially complete flocculation occurs with development of a clear phase after settling the following illustrates the preparation of a vinyl quaternary ammonium compound by transetherification of a lower alkoxy alkyl acrylamide with a non volatile hydroxyalkyl trialkyl ammonium salt a mixture of 70 g of 2 hydroxyethyl trimethyl ammonium chloride choline chloride and 85 g of n isobutoxymethyl acrylamide is acidified with 1 5 ml of hydrochloric acid and 0 1 g of potassium iodide is added as polymerization inhibitor the resulting solution is heated to 75 u00b0 c under vacuum 16 mm and the distillate is collected in a dry ice acetone trap a small amount of air being bled in from time to time to stabilize the distillation and to assist removal of the isobutyl alcohol formed after 5 minutes of heating the vacuum is increased to 3 mm and the temperature raised to 80 u00b0.