The present invention provides switchable adhesives comprising a mixture, inproportions by weight, of 20% to98% of an adhesive, 2% to 80% of curable molecules and 0.05% to 10% ofphotoinitiator. Preferably, the adhesive and curablemolecules are mutually soluble when dry, or the curable molecules and adhesivemay be uniformly dispersed in each other. Preferablythe amount of adhesive in the mixture is in the range 40% to 98% by weight,more preferably 60% to 95% by weight, evenmore preferably 70% to 85% by weight. Preferably the proportion of curablemolecules in the mixture ranges from 2% to 60% byweight, more preferably 5% to 40% by weight, even more preferably 15% to 30%by weight. Preferably, the photoinitiator ispresent in the mixture in the proportions 0.5% to 5% by weight, morepreferably 1% to 3% by weight. Such switchable adhesivesare useful in medical dressings and other removable sheet products, and may besimply prepared by stirring the adhesive, the curablemolecules and the photoinitiator together at room temperature.
