Patent ID: 7329468

Claim:
In a multi-layer composite of two or more polymeric layers at least one of which is formed from a thermosetting composition, said composite comprising at least a first polymeric layer formed on a substrate and a second polymeric layer over at least a portion of said first polymeric layer, wherein in the absence of a boron-containing compound, said first polymeric layer and said second polymeric layer have poor interlayer adhesion, the improvement comprising the inclusion of at least one boron-containing compound selected from boric acid, boric acid equivalents, and mixtures thereof in one or both of said first and second polymeric layers in an amount sufficient to improve the interlayer adhesion of said first polymeric layer and said second polymeric layer, wherein the concentration of the boron-containing compound at a surface region of a polymeric layer containing the boron-containing compound is greater than the concentration of the boron-containing compound in the bulk region of the polymeric layer.