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Moisture barrier coatings

Inactive Publication Date: 2007-01-25
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] The term “diamond-like glass” (DLG) refers to substantially or completely amorphous glass including carbon and silicon, and optionally including one or more additional components selected from the group including hydrogen, nitrogen, oxygen, fluorine, sulfur, titanium, and copper. Other elements may be present in

Problems solved by technology

Organic light emitting devices (OLEDs) can suffer reduced output or premature failure when exposed to water vapor or oxygen.
Metals and glasses have been used to encapsulate and prolong the life of OLED devices, but metals typically lack transparency and glass lacks flexibility.
Barrier performance of the coatings deposited by these methods typically results in a moisture vapor transmission rate (MVTR) in the range from 0.1-5 g / m2 day, depending on the specific processes.

Method used

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Examples

Experimental program
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Effect test

example 1

[0066] A UV-curable polymer solution was made containing 100 grams of epoxy acrylate, commercially available from UCB Chemicals, Smyrna, Ga. under the trade designation “Ebecryl 629”; 2 grams of 1-hydroxy-cyclohexyl-phenyl ketone, commercially available from Ciba Specialty Chemicals, Tarrytown, N.Y. under the trade designation “Irgacurel 84” dissolved in 1000 grams of methyl ethyl ketone. The resulting solution was coated at a web speed of 20 ft / min on a 6.5 inch wide, 100 micron polyethylene terephthalate (“PET”) liner commercially available from Teijin Corp., Japan under the trade designation “HSPE 100” using a microgravure coater commercially available from Yasui Seiki, Japan under the trade designation “Model CAG150” fitted with a 90R knurl. The coating was dried in-line at 70° C. and cured under a nitrogen atmosphere with UV lamp commercially available from Fusion UV systems, Gaithersburg, Md. under the trade designation “F-600 Fusion D UV lamp” operating at 100% power, resulti...

example 2

[0070] The effect of the diamond-like film deposition conditions was established by depositing a two-dyad stack of solution coated acrylate and a diamond-like film. In particular, referring to FIG. 2, the sample analyzed included a PET substrate 112, acrylate layers 114 and 118, and DLG film layers 116 and 120. The process for coating the acrylate layers is described in Example 1.

[0071] The primary variables explored in the study of the sample were as follows: (1) tetramethylsilane (TMS) / oxygen ratio and plasma power; (2) plasma power; and (3) deposition time (thickness) of the DLG film.

[0072] Sixteen different conditions were studied as shown in Table 4 below, and the moisture barrier properties of these films was measured for each of these conditions at 50° C. The MVTR values are shown in the last column in Table 4 below. From these results, it may be seen that there were several conditions that yield MVTR values that are at or below the detection limit of the Mocon tester at 50...

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Abstract

A barrier assembly having a flexible or rigid substrate overcoated with an all polymer multilayer stack. A multilayer on the substrate includes alternating diamond-like glass or carbon layers with polymer layers. Another multilayer includes alternating polymer layers using different types of polymers. The barrier layers can be used to mount, cover, encapsulate or form composite assemblies for protection of moisture or oxygen sensitive articles

Description

FIELD OF INVENTION [0001] The present invention relates to barrier films for protection of moisture or oxygen sensitive articles. BACKGROUND [0002] Organic light emitting devices (OLEDs) can suffer reduced output or premature failure when exposed to water vapor or oxygen. Metals and glasses have been used to encapsulate and prolong the life of OLED devices, but metals typically lack transparency and glass lacks flexibility. Intense efforts are underway to find alternative encapsulation materials for OLEDs and other electronic devices. Examples include various types of vacuum processes are described in the patent and technical literature for the formation of barrier coatings. These methods span the range of e-beam evaporation, thermal evaporation, electron-cyclotron resonance plasma-enhanced chemical vapor deposition (PECVD), magnetically enhanced PECVD, reactive sputtering, and others. Barrier performance of the coatings deposited by these methods typically results in a moisture vap...

Claims

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Application Information

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IPC IPC(8): B32B17/06B32B27/30B05D1/36H05H1/24C08J7/043C08J7/046C08J7/048
CPCB05D1/62B05D7/546B05D7/58C08J7/045C08J7/123Y10T428/30C23C16/545H01L51/448H01L51/5237Y10T428/26Y10T428/265C23C16/26Y10T428/31935Y10T428/31504C08J7/0423C08J7/043C08J7/048C08J7/046H10K30/88H10K59/8731H10K59/8721Y02E10/549H10K50/8423H10K50/8445
Inventor PADIYATH, RAGHUNATHDAVID, MOSES M.
Owner 3M INNOVATIVE PROPERTIES CO
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