Polyurethane adhesive compositions containing oxyacid of phosphorus and silane coupling agent
AssigneeTakeda Chemical Industries, Ltd.
InventorsKyuya Yamazaki, Sachio Igarashi
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Abstract
A polyurethane adhesive composition, which comprises an organic polyisocyanate, a polyol, an oxyacid of phosphorus or a derivative thereof, an epoxy resinand a silane coupling agent. The polyurethane adhesive composition, when used as an adhesive for packaging materials for food, provides the bond showing outstandingly excellent adhesion strength, heat resistance and hot-water resistance between metal foil such as aluminum foil and films of plastics such as polyethylene, polypropylene, nylon and polyethylene terephthalate etc.
Claims9
A polyurethane adhesive composition, which comprises an organic polyisocyanate, a polyol, about 0.01 to 10 weight percent based on the total adhesive composition of an oxyacid of phosphorus or a derivative thereof, about 1 to 50 weight percent based on the total adhesive composition of an epoxy resin and about 0.05 to 20 weight percent based on the total adhesive composition of a silane coupling agent and wherein the ratio of the number of the NCO groups of the organic polyisocyanate to the number of active hydrogen groups of the polyol, the oxyacid of phosphorus or the derivative thereof and the epoxy resin is in the range of about 0.4 to 20.
Dependencies are inferred from the claim text.