| 主权项 |
1. A polyurethane composition consisting of a first and a second component;
wherein the first component comprises
at least one alkoxylated aromatic diol A1 with an average molar mass in the range of 300 to 1000 g/mol,at least one aliphatic or cycloaliphatic diol A2 with a molar mass in the range of 90 to 200 g/mol, which is not a linear alkylene dial with two primary OH groups,at least one polybutadiene polyol A3 with an average OH functionality in the range of 2.1 to 2.9, especially 2.3 to 2.7, and with an average molar mass in the range of 2000 to 4000 g/mol, especially 2500 to 3000 g/mol, and the second component comprises
at least one polyisocyanate; wherein the diol A1, the diol A2 and the polybutadiene polyol A3 are present in a quantity such that
the weight ratio A1/A2 falls in the range of 0.1 to 1, preferably 0.2 to 0.7, especially 0.3 to 0.7,the weight ratio A3/(A1+A2) falls in the range of 3 to 9, preferably 4 to 8, especially 5 to 8, andthe fraction of polybutadiene polyol A3, based on all polyols present in the first component, falls in the range of 50 to 90 wt.-%, preferably 65 to 90 wt.-%, especially 75 to 90 wt.-%. |
