Abstract: A method of essentially completely polymerizing ultraviolet-curable vinyl compositions containing monofunctional acrylate diluents, the method comprising:(a) admixing with the composition at least about 1 weight percent, based upon the weight of the composition, of a polyester additive having a molecular weight not in excess of about 1,000, and(b) exposing the admixture of (a) to a sufficient amount of radiant energy to essentially completely polymerize the vinyl components of the composition.For example, a composition consisting of the diacrylate of a bisphenol A and epichlorohydrin condensation adduct in a dicyclopentadiene acrylate diluent is vinyl polymerized in the presence of ethylene diacetate with electromagnetic radiation such that less than 2 percent unreacted dicyclopentadiene acrylate monomer is present in the resulting cured composition.

Abstract: Cyclopropylcyanide is prepared by an improved process comprising reacting by contacting a .gamma.-halo-butyronitrile or mixture thereof, with an alkali metal hydroxide in the presence of a catalytic amount of an onium salt. For example, the reaction of 4-chlorobutyronitrile with sodium hydroxide in the presence of benzyltriethylammonium chloride produces cyclopropylcyanide in high yield.