Multifunctional acrylic oligomers of branched structure, by polyaddition between multifunctional amines and acrylates

Abstract

An acrylated oligomer, having a number-average acrylate functionality f>2, of branched structure results from the polyaddition reaction of at least one amine A) having a functionality fof N—H groups of at least 2, to at least one multifunctional acrylate B) having a functionality fof acrylate groups of at least 2, with an average functionality per mole of all of the components A)+B) of greater than 2 and with the oligomer comprising in its repeating unit structure at least one —OC—CH—CH—N═ aminoacrylate group resulting from the polyaddition and with a content of nitrogen resulting from the amine A) of greater than or equal to 0.35 mEq/g and an initial ratio r=acrylate/N—H of between rand 1.1 rwith r=0.90*(f−1)*(f−1) and r=2*f+2*f−6 and the average number nof repeating units per oligomer n=1/[(r*f/f)+1−f].