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 phosphoric acid in an amount sufficient to improve {HEAD ~ the strength} of {TAIL ~ said bond} 
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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 phosphoric acid in an amount sufficient to improve { HEAD ~ the strength } of { TAIL ~ said bond }
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