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US 5,126,880 AGranted
Polymeric reflective bodies with multiple layer types
AssigneeThe Dow Chemical Company
InventorsJohn A. Wheatley, Walter J. Schrenk
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AssigneeThe Dow Chemical Company
InventorsJohn A. Wheatley, Walter J. Schrenk
Estimating the term…
A multilayered, highly reflective polymeric body comprising at least two types of optical layers which is thermoformable and capable of being fabricated into films, sheets and a variety of parts while maintaining a uniform reflective appearance is provided. The reflective polymeric body includes at least first and second diverse polymeric materials having a sufficient number of layers of the first and second polymeric materials such that at least 30% of light incident on the body is reflected. A portion of the layers have optical thicknesses between 0.09 and 0.45 .mu.m, and the remaining layers have optical thicknesses of not greater than 0.09 .mu.m or not less than 0.45 .mu.m. The first and second polymeric materials differ from each other in refractive index by at least about 0.03.
A reflective polymeric body of at least first and second diverse polymeric materials, the body comprising a sufficient number of layers of said first and second polymeric materials such that at least 30% of light incident on said body is reflected, wherein said first and second Polymeric materials differ from each other in refractive index by at least about 0.03, and wherein said layers of said first and second polymeric materials have optical thicknesses such that P.sub.f .ltoreq.0.5, where
A reflective polymeric body of at least first and second diverse polymeric materials, the body comprising a sufficient number of layers of said first and second polymeric materials such that at least 30% of light incident on said body is reflected, with a portion of said layers having an optical thickness of between 0.09 and 0.45 .mu.m, with the remaining layers having an optical thickness of not greater than 0.09 .mu.m or not less than 0.45 .mu.m, wherein said first and second polymeric materials differ from each other in refractive index by at least about 0.03, and wherein there is an absence of visibly perceived color reflected from said body.
A reflective polymeric body of at least first and second diverse polymeric materials, the body comprising a sufficient number of layers of said first and second polymeric materials such that at least 30% of light incident on said body is reflected, wherein said first and second polymeric materials differ from each other in refractive index by at least about 0.03, and wherein said layers of said first and second polymeric materials have optical thicknesses such that the Munsell chroma saturation value of light reflected from said body is /3 or less.
A reflective polymeric article having at least first and second major surfaces, said article comprising at least first and second diverse polymeric materials, the body comprising a sufficient number of layers of said first and second polymeric materials such that at least 30% of light incident on said body is reflected, wherein a portion of said layers have optical thicknesses between 0.09 and 0.45 .mu.m and the remaining layers have optical thicknesses of not greater than 0.09 .mu.m or not less than 0.45 .mu.m, wherein said first and second polymeric materials differ from each other in refractive index by at least about 0.03, and wherein said article includes a pigmented layer.
A birefringent light polarizer which reflects light anisotropically, comprising multiple layers of at least first and second diverse polymeric materials, a portion of said layers having an optical thickness of between 0.09 and 0.45 .mu.m, with the remaining layers having an optical thickness of not greater than 0.09 .mu.m or not less than 0.45 .mu.m, wherein said first and second polymeric materials differ from each other in refractive index by at least about 0.03 in one plane of the polarizer.
Dependencies are inferred from the claim text.