The used OH:NCO ration are 1:1,1:1.6, and 1:2
Chain extension and crosslinking steps are not performed.
Hello dear you can try to modify the composition and reduce the Tg of the polyurethane.
As you are not using chain extender so, to improve adhesion you can substitute a little part of your polyol with some tri functional hydroxyl compound like glycerine or TMP. I think it will work.
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