tin dilaurate a film drying time fdt of 43 minutes was obtained an nco prepolymer with an nco content of 16 10 and a viscosity of 3100 mpa s at 23 u00b0 c was obtained from 371 g of pol vii 15 g of trimethylol propane and 614 g of iso i and 170 g of iso ii the film drying time fdt after addition of 0 015 dbtl was 42 minutes the adhesives were given to the institut f u00fcr fenstertechnik e v institute for window technology in rosenheim to test according to din en 204 loading group d4 and watt 91 in each case 20 standard compliant test pieces were produced and tested the following results were obtained 0069 storage 1 7 days at standard reference atmosphere 20 u00b0 c and 65 relative humidity rh storage 3 7 days at standard reference atmosphere 4 days in cold water 20 u00b0 c storage 5 7 days at standard reference atmosphere 6 hours in boiling water 2 hours in cold water storage 6 7 days at standard reference atmosphere 6 hours in boiling water 2 hours in cold water 7 days at standard reference atmosphere watt 91 1 hour stored at 80 u00b0 c and hot splitting n mm 2 adhesive strength in the shear tension test at a feed rate of 50 mm min af adherent failure as of bonded surface the table shows that although din en 204 loading d4 was fulfilled by all of the prepolymers only the nco prepolymer according to the invention retained considerable adherent failure during lengthy storage in water storage 3 the prepolymer according to the invention also performed very well in the heat.