Adhesive compounds containing getter materials that can be activated

Abstract

An adhesive comprising a getter material and optionally a solvent comprising a catalyst activatable by means of an external stimulus for the reaction of the getter material with a permeate can tolerate brief contact with permeates such as moisture in particular before user application, without any significant impairment of getter capacity.

Description

[0001]This is a 371 of PCT / EP2015 / 073898 filed 15 Oct. 2015, which claims foreign priority benefit under 35 U.S.C. 119 of German Patent Application 10 2014 222 036.6 filed Oct. 29, 2014, the entire contents of which are incorporated herein by reference.[0002]The present invention relates to an adhesive comprising a getter material and optionally a solvent, to an adhesive tape comprising this adhesive, to the use of such an adhesive and such an adhesive tape, and to a method for applying the adhesive or the adhesive tape. The invention further relates to an adhesive tape comprising this adhesive and to the use of such an adhesive.BACKGROUND OF THE INVENTION[0003]Such adhesives are common knowledge. The getter material present in the adhesive is capable of scavenging substances capable of permeation, for example water, oxygen, low molecular weight hydrocarbons or volatile organic compounds, which penetrate into the adhesive. Adhesives of this kind serve, for example, to encapsulate ar...

AI Technical Summary

Benefits of technology

The inventive adhesive has a low amount of catalyst, preferably less than 5% by weight, which can be activated by external factors like UV radiation, temperature change, or visible light. It has an adhesive base composed of at least one elastomer and at least one tackifying resin, which can be further combined with a getter material, a solvent, and additional components like a reactive resin. The adhesive is a pressure-sensitive adhesive and can be easily applied to the desired site. It is of particular advantage when used with at least one reactive resin that has a curable group that can undergo reaction to achieve its full bonding action.

Problems solved by technology

A technical challenge for the achievement of adequate lifetime and functioning of (opto)electronic arrangements in the field of inorganic and / or organic (opto)electronics, but very particularly in the field of organic (opto)electronics, is considered to be protection of the components present therein from permeates.

A multitude of (opto)electronic arrangements in the field of inorganic and / or organic (opto)electronics, very particularly in the case of use of organic raw materials, are sensitive both to water vapour and to oxygen, the penetration of water or water vapour being classified as a major problem for many arrangements.

During the lifetime of the electronic arrangement, therefore, protection by encapsulation is required, since the performance otherwise declines over the period of use.

However, highly crystalline materials are generally less transparent, and greater crosslinking leads to lower flexibility.

A low solubility term S alone is usually insufficient to achieve good barrier properties.

If this filler, however, is stored as usual under ambient conditions, it absorbs water even from the environment and is no longer able to function as a getter material to an industrially utilizable degree.

Difficulties in the case of such adhesives or tapes made from such adhesives are storage and transport before the ultimate use.

This is very disadvantageous specifically for applications in electronics, since the adhesive tapes are usually die-cut to size at external converters and hence have contact with moisture.

Apart from the reduction in the getter function, i.e. apart from the ability to act as getters—and in this case to absorb water, it is thus no longer possible to make any clear statement as to the getter capacity, i.e. as to the ability to absorb water, that the adhesive or the adhesive tape still has after application.

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