Phosphate Esters: New Coating Materials for a Sustainable Release Paper.

Paper manufacturers have long used silicone as the coating agent for release liners. However, silicone-based release paper is very difficult to recycle due to covalent bonds between silicone and fibers. The most suitable solution to overcome this problem is to use alternative coating materials with adequate release properties, provided that they can be easily repulped in typical paper recycling facilities. We proposed a coating agent composed of phosphate esters and dimethylacetamide in order to manufacture a recyclable and efficient release paper. Analyses carried out on coated sheets showed that phosphate esters allowed the formation of a surface with adequate release properties (low peeling force and surface free energy). In addition, the residual adhesion values obtained with phosphate esters confirmed that they are well anchored on the backing paper surface, thus limiting the mass transfer to the adhesive tape. Silicone-based release paper is very difficult to recycle due to covalent bonds between silicone and fibers. The most suitable solution to overcome this problem is to use alternative recyclable and efficient coating materials. Sheets coated with phosphate esters provide a surface with low peeling forces, and residual adhesion values confirming the successful anchoring of phosphate ester on the backing paper. image