| abstract |
The invention relates to a moisture-curing polyurethane composition, containing (i) at least one linear isocyante-group-containing polymer (P1) with an NCO content in the region of 0.3 to 3.3 wt.%, obtained from the reaction of at least one monomeric, aromatic diisocyanate and a polyether diol with an OH number in the region of 5 to 37 mg KOH/g; (ii) at least one branched isocyanate-group-containing polymer (P2) with an NCO content in the region of 1 to 10 wt.%, obtained from the reaction of at least one monomeric, aromatic diisocyante and at least one polyether triol with an average OH functionality of at least 2.2 and an OH number in the region of 16 to 380 mg KOH/g; and (iii) a content of softeners of max. 15 wt.% in relation to the total composition; characterised in that the polymer (P1) and the polymer (P2) are present in a weight ratio in the region of 80/2 to 95/5. The invention also relates to the use of the composition as an elastic adhesive or elastic sealant or elastic coating. The composition according to the invention is provided with high elongation, surprisingly high strength and surprisingly good adhesion to plastic substrates, even if the composition is formulated such that it has a very low monomeric diisocyante content and therefore an attractive EHS classification. |