Biobased Alkali Soluble Resins promoting supramolecular interactions in sustainable waterborne Pressure-Sensitive Adhesives: High performance and removability

Social environmental demands are increasingly promoting the development of low carbon footprint adhesive materials capable of providing excellent properties and ensuring clean removability. Herein, high performance and easy removable waterborne pressure-sensitive adhesives with biobased contents up to 71% stabilized with novel biobased alkali soluble resins (ASRs) have been successfully developed. 2-octyl acrylate (2OA), isobornyl methacrylate (IBOMA) and isosorbide (di)methacrylate (ISOMAraw) are the main biobased monomers used to synthesize the ASR and waterborne polymer dispersions. Pendant double bonds coming from isosorbide dimethacrylate promoted the grafting of the ASR resin, whereas hydrogen-bonding interactions provided by free OH groups create supramolecular interactions improving the viscoelastic character of the polymer network enhancing both the elasticity and energy dissipation of the pressure- sensitive adhesives along a greater range of frequencies (from 10(-1) to 10(3) Hz). Furthermore, the presence of carboxylic groups in the pressure-sensitive adhesive compositions lead to a clean and fast removability of the adhesive tape from the glass substrate in basic media in 20 min. These novel biobased waterborne PSA compositions are ideal candidates for high performance applications where an easy and sustainable detachment after their use are required.

Automated summary

Novel high performance and easy removable waterborne pressure-sensitive adhesives with biobased contents have been developed, using new biobased alkali soluble resins and interactions such as hydrogen bonding and pendant double bonds to enhance both performance and clean removability.