CPC B32B 15/095 (2013.01) [B32B 15/18 (2013.01); B32B 15/20 (2013.01); B32B 27/40 (2013.01); C08G 18/4808 (2013.01); C08G 18/7671 (2013.01); B32B 2250/03 (2013.01); B32B 2250/40 (2013.01); B32B 2307/536 (2013.01); B32B 2307/54 (2013.01); B32B 2375/00 (2013.01); B32B 2605/12 (2013.01); B32B 2605/18 (2013.01)] | 19 Claims |
1. A composite element having the following layer structure:
(i) 2 mm to 20 mm of metal,
(ii) 10 mm to 100 mm of compact polyurethane formulation, said polyurethane formulation being obtainable by reacting
(a) a compound having at least two isocyanate groups with
(b) polyether polyol, optionally in the presence of
(c) catalyst and/or
(d) auxiliaries and/or additives,
(e) chain extenders
(iii) 2 mm to 20 mm of metal,
wherein the compound (a) having at least two isocyanate groups has an NCO content of 20% to 50% and the polyether polyol (b) is a mixture comprising polyether polyol (b1) and polyether polyol (b2),
wherein the polyether polyol (b1) has a number-average molecular weight between 3.0×103 g/mol and 7.0×103 g/mol and an average functionality of 2.2 to 2.7, the polyether polyol (b2) has a number-average molecular weight between 0.15×103 g/mol and 2.0×103 g/mol and an average functionality of 2.5 to 3.5, and wherein the polyether polyol (b1) is present in the mixture at 50% by weight to 95% by weight and the polyether polyol (b2) is present in the mixture at 5% by weight to 50% by weight.
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