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dsm patents Dielectric,



Published March 19, 2007
Patent No. U.S. 7,109,253 B1
DSM N.V. has been awarded a patent for a radiation curable composition comprised of an acrylate functional urethane oligomer having a hydrocarbon backbone; five to 50% weight, relative to the total weight of the composition, of one or more polyfunctional diluents selected from the group consisting of polyacrylated alkyl monomers, bisphenol A diacrylate, and ethoxylated bisphenol A diacrylate; a (meth)acrylate ester of phosphoric acid; 1.0 to 10% weight, relative to the total weight of the composition, of a photoinitiator; and five to 50% weight, relative to the total weight of the composition, of one or more monofunctional diluents selected from the group consisting of alkyl (meth)acrylate monomers, N-vinyl functional diluents, and vinyl ether functional diluents; wherein the composition, after cure, has a dielectric dissipation factor at 60 Hz and 150° C of lower than about 0.2; and at least one Tg of below 20° C.


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