PU composition of two components with delayed crosslinking

Polyurethane composition two crosslinking components composed of - a component A containing polyols, additives, - a component B containing 100 to 65% by weight of aromatic polyisocyanates, 0 to 35% by weight of aliphatic polyisocyanates and 0, 1 to 3.0% by weight of retardant and optionally additives case, wherein the mixed viscosity (EN ISO 2555) of 100 mPas 3000 mPas at 25 ° C composition, determining the viscosity immediately after mixing and having the crosslinked composition one glass transition temperature (Tg) above 50 ° C (measured by DSC, DIN 11357) and a period over 60 min application time having to understand application period after which the viscosity of a mixture at 25 ° C amounted to more than 50,000 mPas.