Polyurethane composition with good adhesion to plastics

Abstract

A moisture-curing polyurethane composition including (i) at least one linear polymer P1 containing isocyanate groups and having an NCO content in range from 0.3%-3.3% by weight, obtained from reaction of at least one monomeric aromatic diisocyanate and polyether diol having an OH number in range from 5-37 mg KOH/g, (ii) at least one branched polymer P2 containing isocyanate groups and having an NCO content in range from 1%-10% by weight, obtained from reaction of at least one monomeric aromatic diisocyanate and at least one polyether triol having an average OH functionality of at least 2.2 and OH number in range from 16-380 mg KOH/g, (iii) and a content of plasticizers of not more than 15% by weight, based on overall composition, wherein polymers P1 and P2 are present in weight ratio in range from 80/20-95/5, and to the use of composition as elastic adhesive or elastic sealant or elastic coating.

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