MOISTURE-CURING COMPOSITION WITH GOOD ADHESIVE PROPERTIES

摘要

The present invention relates to a moisture-curing composition that is liquid at ambient temperature and optionally highly viscous, containing: - at least one polyether urethane polymer (P1) containing isocyanate groups and having a content of at least 80 % by wt. 1,2-propyleneoxy units in the polyether segment, and - at least one hydrophobic polymer (P2) containing isocyanate groups and being liquid at ambient temperature, obtained by reacting at least one monomeric diisocyanate and a hydrophobic diol having an OH-number ranging between 28 and 120 mg KOH/g, the polymers P1 and P2 being produced separately and said polymers P1 and P2 having a weight ratio ranging between 70/30 and 98/2. Thanks to the presence of the hydrophobic polymer (P2), the composition according to the invention exhibits improved properties in terms of open time, adhesion, application and weather resistance, with unchanged good properties of storage stability, curing rate, strength, ductility, elasticity and hazardous material classification. Compositions of this type are particularly suitable for use as elastic adhesives in replacement glass for vehicles.