Formable reflective multilayer body
First Claim
1. A formable polymeric multilayer reflective body having a substantially uniform reflective appearance over substantially the entire range of the visible spectrum comprising:
- at least first and second diverse polymeric materials, the body comprising a sufficient number of alternating layers of said first and second polymeric materials such that at least 40% of visible light incident on said body is reflected, a substantial majority of the individual layers of said body having optical thicknesses in the range where the sum of the optical thicknesses in a repeating unit of said polymeric materials is greater than about 190 nm, wherein said first and second polymeric materials differ from each other in refractive index by at least about 0.03, wherein said layers have a gradient of optical layer repeat unit thicknesses spanning a range of optical repeating unit thicknesses through the thickness of said body of at least about 190 nm to 340 nm times a predetermined draw ratio of at least about 1.25, and wherein said gradient of optical layer repeat unit thicknesses is a quartic function, said gradient of optical layer repeat unit thicknesses providing continuous wavelength coverage over substantially the entire range of the visible spectrum for said body to maintain a substantially uniform reflective appearance when drawn.
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Accused Products
Abstract
A formable multilayer reflective polymeric body which has a substantially uniform broad bandwidth reflectance over substantially the entire range of the visible spectrum to provide a substantially uniform reflective appearance is provided. The body includes at least first and second diverse polymeric materials, the body comprising a sufficient number of alternating layers of the first and second polymeric materials such that at least 40% of visible light incident on the body is reflected. A substantial majority of the individual layers of the body have optical thicknesses in the range where the sum of the optical thicknesses in a repeating unit of the polymeric materials is greater than about 190 nm, and the first and second polymeric materials differ from each other in refractive index by at least about 0.03.
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Citations
26 Claims
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1. A formable polymeric multilayer reflective body having a substantially uniform reflective appearance over substantially the entire range of the visible spectrum comprising:
at least first and second diverse polymeric materials, the body comprising a sufficient number of alternating layers of said first and second polymeric materials such that at least 40% of visible light incident on said body is reflected, a substantial majority of the individual layers of said body having optical thicknesses in the range where the sum of the optical thicknesses in a repeating unit of said polymeric materials is greater than about 190 nm, wherein said first and second polymeric materials differ from each other in refractive index by at least about 0.03, wherein said layers have a gradient of optical layer repeat unit thicknesses spanning a range of optical repeating unit thicknesses through the thickness of said body of at least about 190 nm to 340 nm times a predetermined draw ratio of at least about 1.25, and wherein said gradient of optical layer repeat unit thicknesses is a quartic function, said gradient of optical layer repeat unit thicknesses providing continuous wavelength coverage over substantially the entire range of the visible spectrum for said body to maintain a substantially uniform reflective appearance when drawn. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
Specification