Adhesive tape for encapsulating an organic electronic arrangement

• US 10,011,742 B2
• Filed: 03/17/2015
• Issued: 07/03/2018
• Est. Priority Date: 04/11/2014
• Status: Active Grant

• Current Assignee: Tesa SE (maxingvest GmbH & Co. KGaA)
• Original Assignee: Tesa SE (maxingvest GmbH & Co. KGaA)
• Inventors: Keite-Telgenbuscher, Klaus, Rompf, Julia, Stolze, Janika
• Primary Examiner(s): Sullivan, Caleen
• Application Number:
  US15/128,751
• Publication Number:
  US 20170101556A1
• Time in Patent Office: 1,204 Days
• Field of Search: 438 99
• CPC Class Codes: C08K 7/00 Use of ingredients characterised by shape
• CPC Class Codes: C08L 53/00 Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 63/00 Compositions of epoxy resins; Compositions of derivatives of epoxy resins
• CPC Class Codes: C09J 11/08 Macromolecular additives
• CPC Class Codes: C09J 153/00 Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
• CPC Class Codes: C09J 2203/318 for the production of liquid crystal displays
• CPC Class Codes: C09J 2203/326 for bonding electronic components such as wafers, chips or semiconductors
• CPC Class Codes: C09J 2301/122 the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
• CPC Class Codes: C09J 2301/302 the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
• CPC Class Codes: C09J 2301/312 parameters being the characterizing feature
• CPC Class Codes: C09J 2301/408 additives as essential feature of the adhesive layer
• CPC Class Codes: C09J 2400/22 Presence of unspecified polymer
• CPC Class Codes: C09J 2423/00 Presence of polyolefin
• CPC Class Codes: C09J 2427/00 Presence of halogenated polymer
• CPC Class Codes: C09J 2453/00 Presence of block copolymer
• CPC Class Codes: C09J 2467/006 in the substrate
• CPC Class Codes: C09J 7/22 Plastics; Metallised plastics
• CPC Class Codes: C09J 7/255 Polyesters
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: H01L 21/56 Encapsulations, e.g. encapsulation layers, coatings
• CPC Class Codes: H01L 23/293 : Organic, e.g. plastic
• CPC Class Codes: H01L 23/3107 : the device being completely enclosed
• CPC Class Codes: H01L 2924/00 : Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 : Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H10K 30/88 : Passivation; Containers; Encapsulations
• CPC Class Codes: H10K 50/844 : Encapsulations
• CPC Class Codes: H10K 85/141 : comprising aliphatic or olefinic chains, e.g. poly N-vinylcarbazol, PVC or PTFE
• CPC Class Codes: H10K 85/151 : Copolymers
• CPC Class Codes: Y02E 10/549 : Organic PV cells

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/m², 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/m²d and a refractive index of less than 1.45.

Claims

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/m², and the disperse domains

have an average diameter in a size range from 0.1 μ

m to 50 μ

m,

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/m²d, 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 μ

m and 50 μ

m.

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 μ

m has a water vapor permeation rate of less than 50 g/(m²·

d) and/or an oxygen transmission rate of less than 5000 g/(m²·

d·

bar).

7. The adhesive according to claim 1,

further wherein,

the adhesive in a layer 50 μ

m 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/m², and the disperse domains

have an average diameter in a size range from 0.1 μ

m to 50 μ

m, 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 acrylate);

poly(2-heptafluorobutoxy)ethyl acrylate);

poly(chlorotrifluoroethylene);

poly(2,2,3,4,4-hexafluorobutyl acrylate);

poly(trifluoroethyl acrylate);

poly(2-(1,1,2,2-tetrafluoroethoxy)ethyl acrylate);

poly(trifluoroisopropyl methacrylate);

poly(2,2,2-trifluoro-1-methylethyl methacrylate);

poly(2-trifluoroethoxyethyl acrylate);

poly(vinylidene fluoride);

ethylene chlorotrifluoroethylene;

poly(trifluoroethyl methacrylate); and

,

poly(isobutyl methacrylate).

30. 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/m²,

and the disperse domains

have an average diameter in a size range from 0.1 μ

m to 50 μ

m, 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) (PHFPO),

fluorinated ethylene propylene polymer (FEP),

poly(tetrafluoroethylene) (PTFE),

poly(tetrafluoroethylene hexafluoropropylene vinylidene fluoride) (THV),

perfluoroalkoxy polymer (PFA),

poly(ethylene tetrafluoroethylene) (ETFE),

poly(chlorotrifluoroethylene) (PCTFE),

poly(vinylidene fluoride) (PVDF), and,

poly(ethylene chlorotrifluoroethylene) (ECTFE),

as well as co-polymers and terpolymers thereof.