Gas barrier
First Claim
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1. An adhesive having high resistance to gas diffusion, which adhesive comprises:
- polymeric material having adhesive properties, and nanoscale particles formed of amorphous aluminum oxynitrides, silicon oxynitrides, or silicon aluminum oxynitrides having an aspect ratio of between about 3,000 to 1 and about 50,000 to 1, dispersed substantially uniformly throughout said polymeric material.
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Abstract
Nanoparticles of amorphous aluminum oxynitride or silicon oxynitride having a very high aspect ratio are used to fill polymeric materials to provide products that have an extremely low WVTR/OTR. Such products are particularly effective for incorporation into organic light-emitting devices or the like which are susceptible to degradation from moisture and/or oxygen. Pressure sensitive and/or thermosetting adhesives filled with such particles create excellent sealants. Polymeric sheets or films made from resin in which these nanoparticles are dispersed, or intimately associated with, before extrusion exhibit very low WVTR/OTR.
46 Citations
20 Claims
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1. An adhesive having high resistance to gas diffusion, which adhesive comprises:
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polymeric material having adhesive properties, and nanoscale particles formed of amorphous aluminum oxynitrides, silicon oxynitrides, or silicon aluminum oxynitrides having an aspect ratio of between about 3,000 to 1 and about 50,000 to 1, dispersed substantially uniformly throughout said polymeric material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A transparent polymeric gas diffusion barrier material, which material comprises:
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sheetlike transparent polymeric material, and nanoscale particles dispersed throughout said polymeric material, said nanoparticles being formed of amorphous aluminum oxynitrides or silicon oxynitrides or a mixture thereof having an aspect ratio of between about 3,000 to 1 and about 50,000 to 1, said nanoparticles being transparent to both visible and UV light, and said nanoparticles being present in such a quantity that the WVTR and the OTR of said sheetlike polymeric material is reduced by at least about 30%. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. Particles useful in creating transparent polymeric gas diffusion barrier materials, which particles comprise:
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nanoscale particles formed of amorphous aluminum and/or silicon oxynitrides having an aspect ratio of between about 3,000 to 1 and about 50,000 to 1, and a thickness between about 100 ANG and 1,000 ANG, said particles being transparent to both visible and UV light and having no defined crystalline structure, and said particles when present in polymeric material in an amount of at least about 1 weight % causing the WVTR and the OTR of the polymeric material to be reduced by at least about 30%. - View Dependent Claims (19, 20)
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Specification