In a method of coating a vinyl resin layer with a coating composition comprising a radiation curable acrylourethane, a photoinitiator and at least one unsaturated addition polymerizable monomer polymerizable with said acrylourethane and radiation curing the coated vinyl resin layer to form a bond, the improvement comprising including in said coating composition a monoester or diester of {HEAD ~ phosphoric acid} in {TAIL ~ an amount} sufficient to improve the strength of said bond 
In a method of coating a vinyl resin layer with a coating composition comprising a radiation curable acrylourethane , a photoinitiator and at least one unsaturated addition polymerizable monomer polymerizable with said acrylourethane and radiation curing the coated vinyl resin layer to form a bond , the improvement comprising including in said coating composition a monoester or diester of { HEAD ~ phosphoric acid } in { TAIL ~ an amount } sufficient to improve the strength of said bond
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