Structured Smudge-Resistant Coatings and Methods of Making and Using the Same
First Claim
Patent Images
1. A smudge-resistant, composite coating comprising:
- a matrix, anda particulate embedded within, and protruding from, at least a portion of the matrix,wherein the particulate has a refractive index within about 20% of a refractive index of the matrix, the particulate has a polydispersity index of at least about 1 or greater, and the particulate is present within the matrix in a concentration gradient having a highest concentration at an exterior surface of the matrix, and wherein the composite coating has a root mean square surface roughness of about 100 nm to about 10 μ
m.
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Abstract
The present invention is directed to smudge-resistant coatings, methods to prepare the coatings, and products prepared by the methods.
469 Citations
23 Claims
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1. A smudge-resistant, composite coating comprising:
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a matrix, and a particulate embedded within, and protruding from, at least a portion of the matrix, wherein the particulate has a refractive index within about 20% of a refractive index of the matrix, the particulate has a polydispersity index of at least about 1 or greater, and the particulate is present within the matrix in a concentration gradient having a highest concentration at an exterior surface of the matrix, and wherein the composite coating has a root mean square surface roughness of about 100 nm to about 10 μ
m.- View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for preparing a smudge-resistant, composite coating, the method comprising:
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depositing a particulate and a matrix to provide an intermediate film; and curing the intermediate film to provide a smudge-resistant, composite coating, wherein the curing embeds the particulate at least partially in the matrix to provide a smudge-resistant, composite coating having a concentration gradient of the particulate that is greatest at the exterior surface of the matrix, and wherein the composite coating has a root mean square surface roughness of about 100 nm to about 10 μ
m.- View Dependent Claims (9, 10, 11)
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12. A distortion-free, smudge-resistant optical coating comprising a substrate having an array of optical elements thereon, the optical elements having an infinite focal length and each optical element having a lateral dimension, measured parallel to the substrate, of about 5 μ
- m to about 200 μ
m, wherein the optical coating has a root mean square surface roughness of about 1 μ
m to about 100 μ
m. - View Dependent Claims (13, 14)
- m to about 200 μ
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15. The distortion-free, smudge-resistant optical coating of claim 15, wherein the array of optical elements comprises aligned layers of materials that are the same or different, and wherein each layer has a refractive index of about 3 or less.
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16. A method for preparing a distortion-free, smudge-resistant optical coating, the method comprising forming on a substrate a layer comprising an array of optical elements, wherein the substrate and the layer are transparent to visible light, wherein the optical elements have an infinite focal length, the optical elements have a lateral dimension, measured parallel to the substrate, of about 5 μ
- m to about 200 μ
m, and the layer has an exterior surface having a root mean square surface roughness of about 1 μ
m to about 100 μ
m. - View Dependent Claims (17, 18, 19)
- m to about 200 μ
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20. A method for preparing a smudge-resistant film, the method comprising:
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depositing a matrix onto a substrate; and exposing the matrix to an abrasive to produce the smudge-resistant film, wherein the film has a root mean square surface roughness of about 100 nm to about 10 μ
m. - View Dependent Claims (21, 22)
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23. A distortion-free, smudge-resistant coating comprising a substrate that is transparent to visible light and having an array of hollow, pointed elements thereon, each element having a height of about 1 μ
- m to about 300 μ
m and a thickness of about 100 nm to about 100 μ
m, wherein the thickness of the elements is not more than 30% of the height of the elements, and wherein the elements do not substantially overlap, and wherein the elements comprise a material having a refractive index that is either less than, or not more than 20% greater than, a refractive index of the substrate.
- m to about 300 μ
Specification