DE752382C - Process for the production of films coated with layers of self-adhesive adhesives, in particular those made of cellulose hydrate - Google Patents

Description

It is known, films made of cellulose hydrate, cellulose derivatives, gelatin or others high molecular weight / substances with adhesive layers to cover. Adhesive solutions based on rubber are used for this or polymers that give the surface of the film self-adhesive properties, d. H. whose adhesive layer only applies pressure to surfaces that cannot be smoothed) permanently feistfaafitet.

In such adhesive strips ¹ , z. B. Cellulose film strips with adhesive layer on rubber

As they have recently been used to close packs and to mend and join documents, etc., the adhesive strength of the adhesive layer does not always meet requirements ¹ , especially when moisture acts from the outside.

It has now been found that an adhesive strip with high adhesive strength of the adhesive ^{layer can be obtained in a simple manner if the 1} FoHe is applied with a polyalkyleneimine before the adhesive layer is applied

or a polyalkylenimine mixture. The preparation 'is ¹ at the same time preferably carried out with the production of the film by the polyalkyleneimine added to the solution, which is used for producing the films. The polyalkylenimine can also be added to the plasticizer bath through which the film is passed after it has been produced. In this way, there is no need for any special processing step. Experience so far has shown that polyethyleneimine is particularly useful for the purpose of the invention. Contents of ο, ι% and less are sufficient to achieve a good effect.

As already mentioned, a major advantage of the new process is that the preparation with the polyalkylenimines used according to the invention because of their Solubility in water and: water-miscible solvents in a simple manner can be carried out during the production of the foils, which makes a special one Work process is superfluous, and that

he nevertheless achieved a very significant improvement in the adhesive strength of the adhesive layer will. However, should it for any reason, e.g. B. when using already dried cellulose hydrate films, desirable be to carry out the preparation in a special operation, so it is Of course, it is also possible to use the substances according to the invention as solutions z. B. in organic solvents, such as alcohol or :. Like., dissolved on the finished film to apply, dry and then apply the actual adhesive layer.

The applicable ones according to the appointment Polyalkylenimines are easily obtained by polymerization! from the monomers Products; these are relatively lower polymers accordingly a viscosity of about 100 cps of their 20% aqueous solution.

Execution example

A cellulose hydrate sheet precipitated from a solution of cellulose in copper oxide ammonia is cleaned and washed out and finally through a plasticizer bath out of a 4% aqueous glycerol solution, which has an addition of 0.02% polyethyleneimine contains. The film is then dried and immediately afterwards on one side with a plastic that remains Covered with a permanent adhesive, which consists of 85% polyvinyl resin and 15% tricresyl phosphate consists. The web is wound up and cut into strips.

Claims (3)

PATENT CLAIMS: 1. Process for the production of layers of self-adhesive adhesives coated films, in particular those made from cellulose hydrate, characterized in that that the films are made of known self-adhesive Adhesives with a solution of polyalkyleneimine or a polyalkyleneimine mixture treated. 2. The method according to claim 1, characterized in that the polyalkyleneimine the starting solution used to manufacture the foils or cellulose hydrate foils added to the plasticizer bath with which the films are treated after their production. 3. The method according to claim 2, characterized in that the polyalkylenimine additive is measured to be 0.1% or less. © 5254 6.