| abstract |
Disclosed is a method for producing a radiation-curable polyurethane (meth) acrylate having a solid content of 100% by weight and a particularly low viscosity as an undiluted system and capable of being diluted with water over a wide range. SOLUTION: (a) Organic polyisocyanate containing NCO functional group, (b) Polyester based on starter molecule having OH functional group and partially esterified with (meth) acrylic acid so that OH functional group remains. A water-dilutable low-viscosity polyurethane comprising reacting an oxyalkylene polyol, (d) an NCO-reactive group and an ionic or latent ionic functional group-containing compound to form a water-dilutable low-viscosity polyurethane (meth) acrylate ( A method for producing a (meth) acrylate, wherein the reaction products of (a), (b), (d) have an NCO content of less than 0.5% by weight, and the polyurethane (meth) acrylate contains (i) an NCO functional group A process which is not produced from a component selected from organic polyisocyanates, (ii) polyoxyalkylene polyols containing OH functional groups and not containing other actinically crosslinkable groups. [Selection figure] None |