Patents

Cognis patents water-based radiation curable epoxy acrylate dispersions

November 10, 2011

WO2011032673
Water based radiation curable epoxy acrylate dispersions (comprises (a) an epoxy acrylate resin with two acrylate groups per molecule, and (b) a dispersant with at least one acrylate group per molecule. The dispersion is obtained by (i) reacting a compound (A) with a compound (B) optionally in the presence of a catalyst, (ii) reacting the resulting reaction mixture having compound A with a compound (C) optionally in the presence of a catalyst, (iii) reacting the resulting reaction mixture with acrylic acid and (iv) dispersing the resulting reaction mixture in water. The dispersion is obtained by initially (i) reacting at least one compound (A) comprising non-ionic compounds having a hydrophilic-lipophilic balance (HLB)-value of less than 12 and at least two oxirane groups per molecule with at least one compound (B) comprising non ionic compounds having a HLB-value of 12-20 and at least hydrogen-acid group per molecule, optionally in the presence of a catalyst, where the compounds (A) and (B) are in an equivalent ratio of 1.3:1-400:1, (ii) reacting the resulting reaction mixture having at least one non ionic compound with a HLB-value less than 12 and at least two oxirane group per molecule (compound A) with at least one compound (C) comprising non ionic compounds with a HLB-value less than 12 and at least a hydrogen-acid group per molecule, optionally in the presence of a catalyst, where the compounds (A) and (C) are in an equivalent ratio of 1.1:1-20:1, (iii) reacting the resulting reaction mixture with acrylic acid by ring opening of all epoxy groups, optionally in the presence of a catalyst and (iv) dispersing the resulting reaction mixture in water. An independent claim is also included for producing the aqueous radiation curable epoxy acrylate dispersion by the method mentioned above).