Adhesive tape for encapsulating an organic electronic arrangement

Patent metadata

Field	Value
Publication number	US-10011742-B2
Application number	US-201515128751-A
Country	US
Kind code	B2
Filing date	Mar 17, 2015
Priority date	Apr 11, 2014
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

Translucent multiphase adhesive comprising at least one continuous phase and dispersed domains, the at least one continuous phase having a refractive index of more than 1.45 and a permeation rate for water vapor of less than 100 g/m 2 , and the disperse domains being present in a size range of 0.1 μm to 50 μm and being included in a weight fraction of not more than 10 wt % in the adhesive, characterized in that the disperse domains are polymeric in nature and have a water vapor permeation rate of less than 100 g/m 2 d and a refractive index of less than 1.45.

First claim

The invention claimed is:

1. A translucent multiphase adhesive comprising at least one continuous phase as well as dispersely distributed domains, the at least one continuous phase comprising:
a refractive index of more than 1.45 and
a water vapor permeation rate of less than 100 g/m 2 , and the disperse domains
have an average diameter in a size range from 0.1 μm to 50 μm,
are present in a weight fraction of not more than 10 wt % in the adhesive, and
wherein the disperse domains are polymeric in nature, have a WVTR of less than 100 g/m 2 d, and have a refractive index of less than 1.45.

2. The adhesive according to claim 1 ,
further wherein,
the average diameter (d50) of the polymeric disperse domains is in a size range between 0.1 μm and 50 μm.

3. The adhesive according to claim 1 ,
further wherein,
the weight fraction of the dispersely distributed polymeric domains in the adhesive is more than 1 wt %,
more particularly between 1 and 5 wt % when the refractive index of the domains is below 1.40, and more particularly between 5 and 10 wt % when the refractive index of the domains is 1.45.

4. The adhesive according to claim 1 ,
further wherein,
the polymeric disperse domains have a refractive index of less than 1.41, preferably of less than 1.37.

5. The adhesive according to claim 1 ,
further wherein,
the continuous phase in the visible light of the spectrum (wavelength range from 400 nm to 800 nm) exhibits a transmittance of more than 70% and/or a haze of less than 5.0%, preferably less than 2.5%.

6. The adhesive according to claim 1 ,
further wherein,
the adhesive at a layer thickness of 50 μm has a water vapor permeation rate of less than 50 g/(m 2 ·d) and/or an oxygen transmission rate of less than 5000 g/(m 2 ·d·bar).

7. The adhesive according to claim 1 ,
further wherein,
the adhesive in a layer 50 μm thick is a light-scattering adhesive having a light transmittance of more than 70% and a haze of more than 10%.

8. The adhesive according to claim 1 ,
further wherein,
the adhesive has only one continuous phase and only one disperse phase.

9. The adhesive according to claim 1 ,
further wherein,
the polymer of the disperse polymeric domains comprises fluorine, preferably in that the polymeric domains are present in the form of fluorine-containing microcrystalline waxes.

10. The adhesive according to claim 1 ,
further wherein,
the adhesive consists of a continuous phase containing an adhesive, and a dispersed phase containing a distributed particulate filler.

11. The adhesive according to claim 10 ,
wherein,
the filler is present in the form of particles in a particle size distribution wherein not more than 1 vol % of the filler exceeds the average layer thickness of the layer of adhesive.

12. The adhesive according to claim 10 ,
wherein,
the continuous phase of adhesive is a pressure-sensitive adhesive or is an activatable adhesive, more particularly a pressure-sensitive adhesive.

13. The adhesive according to claim 1 ,
wherein,
the adhesive is a pressure-sensitive adhesive or is an activatable adhesive, more particularly a pressure-sensitive adhesive.

14. The adhesive according to claim 1 ,
further wherein,
the adhesive comprises at least one getter material which is adapted to sorb at least one permeable substance.

15. The adhesive according to claim 14 ,
further wherein,
the amount of getter material in the adhesive is not more than 10 wt %, preferably not more than 5 wt %, and at the same time is at least 0.01 wt %, preferably at least 0.05 wt %.

16. The adhesive according to claim 14 ,
further wherein, the getter material is in nanoscale form, more particularly such that the extent in at least one dimension is not more than 500 nm, preferably not more than 200 nm, very preferably not more than 100 nm.

17. The adhesive according to claim 1 ,
further wherein, the refractive indices of the continuous phase and of the disperse domains differ by more than 0.8, preferably more than 0.12, and very preferably more than 0.16.

18. An adhesive tape comprising a layer of an adhesive according to claim 1 .

19. The adhesive tape according to claim 17 ,
wherein
the adhesive tape comprises a layer of the adhesive and additionally comprises at least one further layer selected from: an adhesive, a carrier material and a liner.

20. The adhesive tape according to claim 18 ,
wherein,
the carrier material is a polymeric carrier material.

21. The adhesive tape according to claim 19 ,
wherein,
the carrier material comprises at least one in organic barrier layer.

22. A method for protecting an organic electrical arrangement disposed on a substrate, in which a cover is applied to the electronic arrangement in such a way that the electronic arrangement is at least partly covered by the cover,
and the cover is adhesively bonded at least over part of the area to the substrate and/or to the electronic arrangement,
where the adhesive bond includes at least one layer of an adhesive according to claim 1 .

23. The method according to claim 21 ,
further wherein
the layer of adhesive is a layer of an adhesive tape.

24. The method according to claim 21 ,
further wherein,
the cover is adhesively bonded by first applying a layer of the adhesive, optionally as part of a double-sided adhesive tape comprising further layers, and,
thereafter, applying a liner to the substrate and/or the electronic arrangement.

25. The method according to claim 24 ,
further wherein
the layer of adhesive and the liner are applied jointly to the substrate and/or the electronic arrangement.

26. The method according to claim 21 ,
further wherein,
the liner completely covers the electronic arrangement.

27. The method according to claim 21 ,
further wherein,
in addition to the electronic arrangement, a region of the substrate near the electronic arrangement is also at least partly covered by the liner.

28. The method according to claim 21 ,
further wherein,
the layer of adhesive completely covers the electronic arrangement.

29. A translucent multiphase adhesive comprising at least one continuous phase as well as dispersely distributed domains, the at least one continuous phase comprising:
a refractive index of more than 1.45 and
a water vapor permeation rate of less than 100 g/m 2 , and the disperse domains
have an average diameter in a size range from 0.1 μm to 50 μm, and also
are present in a weight fraction of not more than 10 wt % in the adhesive, wherein, the disperse domains are selected from the group consisting of:
poly(hexafluoropropylene oxide);
poly(tetrafluoroethylene-co-hexafluoropropylene);
fluorinated ethylene propylene;
poly(pentadecafluorooctyl acrylate);
poly(tetrafluoro-3-(heptafluoropropoxy)propyl acrylate);
poly(tetrafluoro-3-(pentafluoroethoxy)propyl acrylate);
poly(tetrafluoroethylene);
tetrafluoroethylene hexafluoropropylene vinylidene fluoride;
poly(undecafluorohexyl acrylate);
perfluoroalkoxy;
ethylene tetrafluoroethylene;
poly(nonafluoropentyl acrylate);
poly(tetrafluoro-3-(trifluoromethoxy)propyl acrylate);
poly(pentafluorovinyl propionate);
poly(heptafluorobutyl acrylate);
poly(trifluorovinyl acetate);
poly(octafluoropentyl acrylate;)
poly(methyl 3,3,3-trifluoropropyl siloxane);
poly(pentafluoropropyl acryl

Assignees

• Tesa Se

Inventors

• KEITE-TELGENBüSCHER KLAUS
• Rompf Julia
• Stolze Janika

Classifications

• H10W74/111

  the semiconductor body being completely enclosed · CPC title

• H10W74/01

  Manufacture or treatment · CPC title

• H10W74/47

  comprising organic materials, e.g. plastics or resins · CPC title

• C09J2203/318

  for the production of liquid crystal displays · CPC title

• C09J2400/22

  Presence of unspecified polymer · CPC title