Patent ID: 6852424

Claim:
A composite structure, comprising (a) a first polymer structure and (b) a second polymer structure, the first polymer structure being adhered to the second polymer structure by (c) an adhesive interface between the first polymer structure and the second polymer structure wherein interfacial adhesion is provided by a semicrystalline random copolymer in the first polymer structure, the second polymer structure, or in a third adhesive structure, the semicrystalline random copolymer comprising 70-88 mole % propylene units and alpha olefin units having 2 or from 4 to 10 carbon atoms, the semicrystalline random copolymer having a heat of fusion of from 2 to 90 J/g and a crystallinity of from 2% to 65% of the crystallinity of isotatic polypropylene.