| abstract |
Reactive hotmelt systems containing isocyanate groups based on hydroxypolyols with ester and / or ether groups having a hydroxyl number of 15 to 150 and an average functionality of 1.95 to 2.2 and diphenylmethane diisocyanates in a ratio of isocyanate groups in the diphenylmethane diisocyanates to hydroxyl groups in the polyols of 1 , 4: 1 to 2.5: 1, which have a content of at least 70% by weight of 2,4'-diphenylmethane diisocyanate, are distinguished by a low initial viscosity and increased temperature stability and are suitable as solid adhesives for the various fields of application. |