Bonding together metal-polyurethane-metal sandwich elements, for use e.g. in ships or buildings, involves fixing together elements with projecting metal edges and reacting isocyanate with polyol in the space formed

摘要

Metal-polyurethane-metal composite elements are bonded with one another by forming elements in which the outer metal layers extend at least 7.5 cm beyond the polyurethane, fixing the elements together and then bonding them by reacting isocyanates with NCO-reactive compounds in the space between. Bonding composite elements with a layer structure comprising (i) 2-20 mm metal, (ii) 10-300 mm polyisocyanate-polyaddition product obtained by reacting (a) isocyanates with (b) NCO-reactive compounds and (iii) 2-20 mm metal, in which layers (i) and (iii) extend beyond layer (ii) by a distance (x) of at least 7.5 cm, and the two elements are fixed together and then bonded by reacting (a) with (b) in the space between (i) and (iii). Independent claims are also included for composite elements obtained by this method and for hips or buildings containing such elements.