Cold formable laminate films

Details Cold formable laminate films Cold formable laminate films

1999-11-24

2001-08-07

Weisberger, Richard (Department: 1771)

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

C428S035700, C428S035900, C428S036700, C428S458000, C428S474400, C206S531000, C206S532000

Reexamination Certificate

active

06270869

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to cold-formable laminate films containing a barrier layer that is impermeable to water vapour and gases and, on both sides of the barrier layer, at least one plastic layer; it also relates to the use of the laminate films.
2. Background Art
Known from EP-A 0 845 350 are cold formable laminate films e.g. for so called blister packs or push through packs. Described there are plastic laminates containing a metal foil which are deepened in such a manner that a plurality of recesses or cups results. Shoulders are formed between the individual recesses. The shoulders run completely round each recess and form a flat shoulder area. The materials prepared this way form the base part of a blister pack. The base parts may be filled with substances i.e. the contents. Known contents for blister packs are e.g. tablets, capsules, dragees etc., from the pharmaceutical field, single or if desired having more than one in each recess. After that, the base part is closed off by sealing a lidding foil such as a metal foil—usefully aluminium foil or a laminate containing e.g. a sealing layer and a metal foil—on to the shoulders of the base part by means of the sealing layer.
The described laminate films exhibit good formability. The ratio of the recesses of a blister pack diameter to depth may be selected within a wide range i.e. the walls of the recesses may exhibit a low or high degree of steepness. There is however the need to have laminate films whose formability can be improved even further. Laminate films with much improved formability are in demand e.g. in the field of medical instruments and applicators.
BROAD DESCRIPTION OF THE INVENTION
The object of the present invention is to provide a laminate film for example for a push-through or blister pack e.g. for ampoules, capsules or tablets containing active pharmaceutical ingredients or diagnostics, powder or fluid to pasty substances from the field of pharmaceutica and cosmetics or for medical instruments and applicators having a superior protective action against the uptake of moisture and gases. In the case e.g. of push-through or blister packs it should thereby be possible to keep the size of the pack small in relation to the number of recesses, for example by steep walls in the recesses or as a whole by deeper forming. It should also be possible e.g. to provide smaller shoulder areas and, at the same time still ensure secure water vapour and moisture proof sealing between the base part and the lid part.
That objective is achieved by way of the invention in that the laminate film exhibits the a layered structure of the following kind and order:
a) a plastic layer in the form of a plastic film of a polyvinylchloride, polyester, polypropylene, polyamide, cyclo-olefin copolymer, cast film of polyvinylchloride or a polypropylene
b) a metal foil and
c) an oriented polyamide film of thickness 25 to 32 &mgr;m.
The plastic films a) and c) may—independent of each other—be a monofilm or a film laminate made up of two or more layers of the same or in the case of film a) also different plastics.


REFERENCES:
patent: 5589275 (1996-12-01), Breitler et al.
patent: 0414636 (1990-08-01), None
patent: 0845350 (1998-06-01), None
patent: WO 87/95563 (1987-09-01), None

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