Composite article and method of forming the same

A method of forming a composite article, said method comprising:

• casting a first layer comprising a polymer resulting from the reaction of at least one ethylenically unsaturated monomer;
• curing the first layer to a desired amount of cure;
• casting a second layer different than the first layer and comprising a polyurethane resulting from the reaction of a isocyanate-reactive resin and a polyisocyanate in contact with the first layer when the first layer has achieved the desired amount of cure;
• dispersing an adhesion promoter throughout one of the first and the second layers prior to casting, the adhesion promoter comprising a first reactive end group selected from the group of ethylenically unsaturated monomers, ethylenically unsaturated acrylate monomers, ethylenically unsaturated methacrylate monomers, and combinations thereof and a second reactive end that is reactive with isocyanate;
• and
• reacting the adhesion promoter into the first and second layers through differentially reactive groups such that the adhesion promoter is compatible with the first and second layers to improve adhesion therebetween.

A method of forming a composite article, said method comprising:

• reacting at least one ethylenically unsaturated monomer to form a first layer;
• curing the first layer to a desired amount of cure;
• reacting an isocyanate-reactive resin and a polyisocyanate in contact with the first layer when the first layer has achieved the desired amount of cure to form a second layer different than the first layer;
• and
• homogenously dispersing an adhesion promoter comprising a first reactive end group selected from the group of ethylenically unsaturated monomers, ethylenically unsaturated acrylate monomers, ethylenically unsaturated methacrylate monomers, and combinations thereof and a second reactive end group that is reactive with isocyanate throughout one of the first and the second layers prior to reacting such that the first and second layers are adhered through differentially reactive groups.