Low adhesion paper coatings are produced in industrial scale and they are mainly composed of silicone. These coated papers are used as "release liner" for adhesive tapes. The silicone layer of the "release liner" protects the adhesive against dirt and enables an easy and undamaged release of the adhesive tape without loss of adhesion. The substrate, used for siliconization, should have a non-porous surface in order to avoid penetration of the silicone into the substrate. Hence, most papers are coated with clay (aluminosilicates) to close the porous paper surface. The highly viscous silicone is coated onto the paper surface and thermally cured by hydrosilylation reaction. An expensive platinum catalyst is necessary for this crosslinking reaction. Furthermore, it is difficult to recycle the siliconized papers which is another drawback. In this project, we develop a silicone-free release coating based on modified cellulose. This bio-based coating is applied to the paper surface by roller or blade coater and it is thermally dried. By the addition of a thermal crosslinking agent to the modified cellulose, layer stability is increased and the anchorage to the paper surface is improved. This coating represents a new bio-based alternative to the common used silicone coatings for low adhesion without using an expensive catalyst.

Development and investigation of a cellulose-based low adhesion coating for adhesive tapes

253rd National Meeting (2017)

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