. "In order to neutralize these monomers, preference is given to using alkali metal or alkaline earth metal bases, ammonia or amines, e.g. sodium hydroxide solution, potassium hydroxide solution, sodium carbonate, potassium carbonate, sodium hydrogencarbonate, magnesium oxide, calcium hydroxide, calcium oxide, gaseous or aqueous ammonia, triethylamine, ethanolamine, diethanolamine, triethanolamine, m" . . . . . . . .