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COC-Based Blister Film Solution for Tooth-Whitening Sponge Package

Fri, 07/07/2006 - 7:33am

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When Remedent Inc. packaged the peroxide-laden foam strips that form the basis of its tooth whitening products, it used a blister film from Tekni-Plex based on Topas COC (cyclic olefin copolymer). Polypropylene layers in the film provided needed inertness to peroxide, while the COC core layer provided additional chemical resistance, high moisture barrier for an extended shelf life, and inherent stiffness that gives the blisters a solid, luxurious feel.

Tekni-Plex developed the entire package (tray and lid) in a fast-track project in order to meet Remedent's market launch date. "We used Tekniflex COC P15P, a coextruded blister film having a Topas COC core layer and polypropylene outer surfaces because past experience with it showed it to have the needed inertness and barrier properties," says Michiel van den Berg, director of global pharmaceutical packaging development at Tekni-Plex.

"One of the outer layers is a white polyethylene laminate, which gives the package a clean look and protects the sponge from light. We also used our Teknilid WPSPPE peelable lidding foil containing a peroxide-resistant adhesive to seal the blister."The COC-based film resists prolonged exposure to the water-based, teeth-whitening gel, which has a peroxide concentration as high as 10%. The COC moisture-barrier layer ensures an 18-month shelf life for iWhite and a 14-month shelf life for Metatray. The Tekniflex COC P15P (PP.COC.PP / LDPE) film also forms well on standard thermoforming lines and has a broad thermal processing range for both forming and sealing.

"Tekni-Plex came through with an excellent package in record time," says Pol Lombaert, Remedent's production and R&D manager for chemistry. "We chose a 450 µ COC-layer film, which is thicker than we would normally need for a package of this type. The stiffness of the COC and the added thickness give the blisters an upscale feel. This also keeps users from pushing the sponge through the blister. In addition, the film has good gloss after forming, so its look is congruent with its feel."Information: www.tekni-films.com.

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