Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Patent
1998-07-27
2000-02-15
Hampton-Hightower, P.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
4284735, 528170, 528310, 528322, C09J 702, B32B 712, B32B 2700
Patent
active
060250704
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an adhesive film which comprises at least:
These films may further contain a front layer applied onto the barrier layer.
Adhesive films are generally used as pressure sensitive films to apply markings like decals, labels etc. on different kinds of substrates. Examples of these substrates are metals, glass, plastics, etc. A special type of the latter is vinyl coated canvas for trucks.
These adhesive films should meet a lot of requirements. In the case of soft polyvinyl chloride substrates for instance, which contain a lot of plasticizer, the film should have certain properties to prevent problems caused by the migration of plasticizer from the substrate into the film. If plasticizer from the substrate enters the film it may cause wrinkling and blistering of the film. Further the surface may become tacky and some edge-lifting may occur. The adhesive may also lose its adhesive power.
Irrespective of the kind of substrate used, problems may arise when components of ink layers migrate to the adhesive layer and substrate. Many of the adhesive films are in fact printed with inks dissolved in organic solvents. The solvents and other components may migrate through the upper layer(s) of the adhesive film to the adhesive layer, so that the adhesive properties undergo a temporary or permanent change.
The migration of components from the adhesive layer to the upper layer(s), such as low molecular substances like plasticizers, oils or tackifiers, can also give problems. Such low molecular substances are mainly present in adhesives which are applied by means of a hot-melt technique (that is application from the melt onto a release layer). Up to now the latter could not be used in combination with plastic films.
In the prior art these problems have been solved by using films which consist of a plurality of layers, in which one layer has been incorporated which forms a barrier to the migration of certain components.
Thus European patent application 103407 describes an adhesive film suitable for adhesion to a polyvinyl substrate containing a large amount of plasticizer. This film comprises a first layer of polyvinyl chloride, a second layer of a plasticizer resistant pressure-sensitive adhesive and a third layer between the first and second layer which acts as a barrier for plasticizer from the substrate.
The third layer inhibits the migration of plasticizer from the substrate and has a good flexibility, good adhesion and a good resistance to chemical cleaning agents. The third layer preferably comprises an aliphatic polyurethane resin. Other materials which could be used for this layer are not mentioned.
International patent application WO 92/22619 describes an adhesive flexible film, comprising
As suitable materials for the polymer film elastomers and especially an elastomeric urethane are mentioned. The polymer film preferably has plasticizer migration inhibiting properties. Between the various layers (other) barrier layers may be present, the composition of which is not further indicated.
This does not provide a satisfactory solution for the afore mentioned problems, which occur as a result of migration of plasticizer and like components.
In the prior art other materials for use as barrier layers are known, such as polyethylene, polypropylene, polyethylene terephthalate, etc. However, adhesion of these materials to an upper layer is often a problem. in some cases it is already impossible to obtain proper adhesion between the upper layer and the barrier layer during manufacture. In other cases problems may only appear during use, in the form of delamination of the upper layer and the polymeric barrier layer.
It has now been found that all above mentioned problems may be solved by using a barrier layer comprising a (co)polyamide.
The present invention has the advantage that the (co)polyamide has excellent barrier properties so that the above mentioned problems no longer occur. Moreover the (co)polyamide according to the invention has the advantage that the (co)polyamide layer itself can be used as
REFERENCES:
patent: 3993815 (1976-11-01), Douek et al.
patent: 5415903 (1995-05-01), Hoffman et al.
patent: 5506310 (1996-04-01), Vasselin et al.
patent: 5680653 (1997-10-01), Mathis et al.
patent: 5905099 (1999-05-01), Everaerts et al.
De Grunt Frederick Everardus
De Man Aren Joost
Heederik Peter Johannes
Avery Dennison Corporation
Hampton-Hightower P.
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