| abstract |
The present invention deals with new polyester mixtures which are suitable as hot melt adhesives. The new mixtures contain, as solid polyester fractions, those with a glass transition temperature above 10 ° C. and a hydroxyl number between 20 and 60 and liquid polyesters with a glass transition temperature below −10 ° C. and a hydroxyl number between 10 and 80. This polyester mixture is modified according to the invention by urethanesilylurea groups. This modified polyester blend has softening points of at least 50 ° C. It hardens throughn n n Humidity. When cured, it can be heated to temperatures above 200 ° C without decomposition. A further modification with high molecular weight polyesters with glass transition temperatures below 0 ° C, which may also be functionalized with urethanesilylurea groups, is also possible. |