High heat, sound damping metal-polymer laminate

Claim 1

A metal-polymer-metal structural laminate having an unexpected property balance of high stiffness, improved sound damping, good adhesion between polymer and metal, and automotive paint bake oven stability, said laminate comprising a core of polymeric resinous material having tightly adhered to each side thereof a metal skin layer wherein: (a) said metal skin layer is about 5 to about 40 mils thick; (b) said laminate has a ratio of core thickness to skin thickness of between about 1:3 and about 20:1; (c) said laminate total thickness is between about 15 mils and about 300 mils; (d) said polymeric resinous material comprises the admixture obtained by intimately mixing a block copolymer, a butene-1 polymer and an engineering thermoplastic resin so as to form at least partial continuous interlocking networks wherein (i) said block copolymer comprises at least two monoalkenyl arene polymer end blocks A and at least one substantially completely hydrogenated conjugated diene mid block B, said block copolymer having an 8 to 55 percent by weight monoalkenyl arene polymer block content, each polymer block A having an average molecular weight of between about 5,000 and about 125,000, and each polymer block B having an average molecular weight of between about 10,000 and about 300,000; (ii) said engineering thermoplastic resin has a generally crystalline structure and a melting point over about 120° C.; and (iii) said butene-1 polymer is selected from the group consisting of butene-1 homopolymers, butene-1-alphamonoolefin copolymers, functionalized butene-1 homopolymers, functionalized butene-1-alphamonoolefin copolymers and mixtures thereof where said alphamonoolefin is selected from ethylene, propylene and C 5 to C 10 alphamonoolefins and the alphamonoolefin content of said copolymers is between about 0.1 and about 30.0 mole percent; and (d) wherein said polymeric resinous material comprises 60 to 20 weight percent engineering thermoplastic, 15 to 40 weight percent butene-1 polymer and 25 to 40 weight percent block copolymer.