and so on acrylates and methacrylates acrylic and methacrylic acid 2 polystyrylalkylmethacrylates as 2 polystyrylethylmethacrylate arco chemical co chemlink 4500 vinyl compounds such as vinyl acetate vinyl chloride vinylidene chloride vinyl fluoride styrene acrylonitrile methacrylonitrile and the like the polymeric including oligomeric compositions and the crosslinked polymeric coating sealing and encapsulating compositions of this invention can be prepared by conventional polymerization techniques in which the novel ethylenically unsaturated lactone acrylate or mixture of them is blended with one or more ethylenically unsaturated monomers polymerization catalysts and if desired chain transfer agents and polymerized by any one of a variety of polymerization techniques including bulk polymerization solution polymerization emulsion polymerization aqueous or nonaqueous dispersion polymerization and the like the polymerizations can be carried out at temperatures of from about 60 u00b0 c to about 200 u00b0 c for periods of time of from about two hours to about 10 hours or more the polymerization is preferably carried out in solution using a solvent in which the oligomeric or polymeric product is soluble solvents which can be used in the solution polymerization include for example methyl n amyl ketone methyl i butyl ketone methyl ethyl ketone butyl alcohol toluene 2 ethoxyethyl acetate butyl acetate dioxane toluene xylene isopropanol and the like as well as mixtures of such solvents suitable polymerization catalysts include for example.