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Silicone-Adhesive Interactions In Release Liner Applications

SpecialChem / Aug 4, 2004

Release liners based on silicone (PDMS) chemistry are used extensively in the tape market. Liners serve several useful functions: they are used as a carrier sheet onto which the adhesive is cast; they protect the adhesive during storage and transit; they provide a functional support during die-cutting and printing; they carry useful product instructions; and they ultimately release from the adhesive leaving it undamaged. Most importantly, the release material must not compromise the subsequent performance properties of the tape. Several technical parameters must be met in order to achieve these uses. A basic requirement for silicone-coated release liners is that the release liner surface must be coated uniformly with a continuous layer of silicone and that the silicone layer is well cured. This avoids any interaction that may occur between unreacted silicone species and the adhesive, and it minimizes the possibility of transfer of silicone to the adhesive surface. The level of release also must be adjusted properly, as defined by the customer's end-use requirements, to give consistent release values over time.

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