| 摘要 |
The invention relates to a method for treating mineral surfaces, said method comprising the following steps, a) the mineral surfaces are treated in order to remove impurities and b) the surface is coated with a plastic material. Said method is characterised in that a transparent, compact hydrophobic polyurethane, which can be produced by reacting i) polyisocyanates with ii) compounds comprising at least two hydrogen atoms for reacting with isocyanate groups, is used as the plastic material in step b).
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