Dupont Canada Inc.

Trevor C Arthurs

John R Boocock

Peter Y Kelly

Wayne F Bryce

An adhesive composition formed by admixing under melt conditions (a) 50-95% by weight of a moisture cross-linkable silane-grafted polyolefin having a melt viscosity of less than 100,000 cps, and (b) 5-50% by weight of a polyolefin grafted with at least one ethylenically-unsaturated carboxylic acid or anhydride, and derivatives thereof. The grafted polyolefin has a melt viscosity of less than 100,000 cps, and contains a catalyst for moisture cross-linking of the silane-grafted polyolefin of (a). The adhesive may be used to bond a variety of substrates.

Cross-linkable adhesive polymers

An adhesive composition formed by admixing under melt conditions (a) 50-95% by weight of a moisture cross-linkable silane-grafted polyolefin having a melt viscosity of less than 100 000 cps, and (b) 5-50% by weight of a polyolefin grafted with at least one ethylenically-unsaturated carboxylic acid or anhydride, and derivatives thereof. The grafted polyolefin has a melt viscosity of less than 100 000 cps, and contains a catalyst for moisture cross-linking of the silane-grafted polyolefin of (a). The adhesive may be used to bond a variety of substrates.

A structure is disclosed comprising a layer of polyurethane foam bonded to at least one layer of another material, especially a layer of fibreglass matte, a layer of cellulosic material e.g. cardboard, and/or a layer of polyurethane foam. The layers are bonded together with an adhesive of polyethylene or polypropylene that has been grafted with an ethylenically unsaturated dicarboxylic acid or anhydride thereof, the adhesive containing at least 0.03% by weight of said acid or anhydride. The structure exhibits a temperature for heat-fail resistance in shear of at least 90.degree. C. In embodiments, the polyurethane foam is a rigid polyurethane foam, and the polyethylene and polypropylene have been grafted with fumaric acid, maleic acid or maleic anhydride. As an example, the structure is comprised of a layer of fibreglass matte, at least one layer of polyurethane foam and a layer of fibreglass matte, the layers being bonded together with the adhesive. The structure may be used as so-called headliners in automobiles.

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Kingston, Canada

Trevor C Arthurs