Patent ID: 7799944

Claim:
Process for the manufacture of a (meth)acrylate di-ammonium salt of formula (I) wherein R 1 represents hydrogen or methyl, each R 2 , independently, represents a C1 to C4 alkyl, each R 3 , independently, represents an alkyl or an aralkyl and each X − , independently, represents an anion selected from the group consisting of halides and methylsulfonates, comprising (1) the reaction of the di-amino (meth)acrylate of formula (II) with at least one alkyl or aralkyl derivative of formula R 3 X in an aprotic dipolar organic solvent containing at most 5000 ppm of water and wherein the compound of formula (I) has a solubility at 25° C. of less than 1 g/100 g of solvent and wherein the solubility of the corresponding amino-(meth)acrylate ammonium salt of formula (V) has a solubility at 25° C. of at least 20 g/100 g of solvent; and (2) the separation of the compound of formula (I) from the reaction mixture without dissolving it in water, the compound of formula (I) being separated from the reaction mixture in the form of a solid product comprising, per mole of the compound of formula (I), less than 0.1 mole of the compound of formula (V).