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US 2026/0307875 A1Published application
Multi-layer, coextruded polyester film with reduced puncture resistance, for use as blister cover film
AssigneeMitsubishi Polyester Film GmbH
InventorsHolger KLIESCH, Stephan AUDÖRSCH, Bodo KUHMANN, Matthias KONRAD, Christine SCHMIEDESKAMP
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Abstract
The present invention relates to a multi-layer, coextruded polyester film with reduced puncture resistance, the use of the film as a cover film for blister packs, in particular pharmaceutical blisters (drug blisters) and the resulting closed blisters. The invention likewise relates to a process for producing the polyester film according to the invention.
Claims30
A multilayer, coextruded polyester foil comprising an outer layer (A) and a base layer (B), wherein
- (I) the outer layer (A) consists to an extent of at least 70% by weight of a polymer fraction which consists to an extent of at least 70% by weight of a copolyester which consists to an extent of 50 mol % of a dicarboxylic acid component and to an extent of 50 mol % of a diol component,
- wherein the copolyester derives from polyethylene terephthalate which consists to an extent of 50 mol % of ethylene glycol as diol component and to an extent of 50 mol % of terephthalic acid as dicarboxylic acid component,
- in which in total 15 to 50 mol % of the ethylene glycol and/or of the terephthalic acid is replaced by dicarboxylic acid components and/or diol components other than ethylene glycol and/or terephthalic acid;
- (II) the base layer (B)
- (a) consists to an extent of at least 78% by weight of a polymer fraction which
- (i) consists to an extent of at least 70% by weight of a copolyester which consists to an extent of 50 mol % of a dicarboxylic acid component and to an extent of 50 mol % of a diol component,
- wherein the copolyester derives from polyethylene terephthalate which consists to an extent of 50 mol % of ethylene glycol as diol component and to an extent of 50 mol % of terephthalic acid as dicarboxylic acid component,
- in which in total 2 to 35 mol % of the ethylene glycol and/or of the terephthalic acid is replaced by dicarboxylic acid components and/or diol components other than ethylene glycol and/or terephthalic acid,
- (ii) consists to an extent of 0% to 30% by weight of a polymer incompatible with polyethylene terephthalate,
- (b) the base layer (B) contains 0% to 7% by weight of a particle having a mean particle diameter of d50≥1 μm, based on the total weight of the base layer (B),
- wherein the base layer (B) contains the incompatible polymer as per (ii) and/or the particles as per (b).
8 more elements
Dependencies are inferred from the claim text.