Patent ID: 6025410
Filing Date: 2000-02-15
Classification: C07C,C08F,C08G

Abstract:
A method of making a liquid oligomeric composition, stable for more than one month, having residual pendant unsaturated acrylate groups, useful as a coating when further polymerized in the absence of added photoinitiator, comprising the step of reacting an acetoacetate donor having two, four, six, or eight reactive equivalent functional groups per molecule provided by acetoacetate groups and an excess of acrylate acceptor selected from the group of diacrylate, triacrylate, and tetra-acrylate in the presence of a strong base wherein the reactive equivalent functionality ratios are:a) diacrylate:acetoacetate of.gtoreq.1:1 where acetoacetate functionality=2.gtoreq.4.5:1 where acetoacetate functionality=4.gtoreq.4.5:1 where acetoacetate functionality=6,.gtoreq.3.5:1 where acetoacetate functionality=8,b) triacrylate:acetoacetate of.gtoreq.2.25 where acetoacetate functionality=2.gtoreq.6.4:1 where acetoacetate functionality=4,.gtoreq.7.8:1 where acetoacetate functionality=6,.gtoreq.7.4:1 where acetoacetate functionality=8c) tetraacrylate:acetoacetate of.gtoreq.6. 6 where acetoacetate functionality=2.gtoreq.12.3 :1 where acetoacetate functionality=4.gtoreq.13.2.1 where acetoacetate functionality=6.gtoreq.12.7:1 where acetoacetate functionality=8,wherein said diacrylate is selected from the group ofdiethylene glycol diacrylate,ethoxylated bisphenol A diacrylate,1.6-hexanediol diacrylate,neopentyl glycol diacrylate,polyethylene glycol (Mn200) diacrylate,polyethylene glycol (Mn400) diacrylate,propoxylated neopentyl glycol diacrylate,tetraethylene glycol diacrylate,triethylene glycol diacrylate,tripropylene glycol diacrylate, andwherein said triacrylate is selected from the group oftrimethylolpropane triacrylate,ethoxylated trimethylolpropane triacrylate,tris (2-hydroxyethyl) isocyanurate triacrylate,propoxylated glycerol triacrylate, andpentaerythritol triacrylate, andwherein said tetraacrylate is pentaerythritol tetraacrylate.