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US 5,122,905 AGranted
Relective polymeric body
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 reflective body which is thermoformable and capable of being fabricated into relatively thick parts while maintaining a uniform reflective appearance is provided. The reflective polymeric body includes at least first and second diverse polymeric materials of a sufficient number of alternating layers of the first and second polymeric materials such that at least 30% of the light incident on the body is reflected. A substantial majority of the individual layers of the body have an optical thickness of at least 0.45 micrometers, and adjacent layers of the first and second polymeric materials differ from each other in refractive index by at least about 0.03. The reflective body may be fabricated into sheets, mirrors, noncorroding metallic appearing articles and parts, reflectors, reflective lenses, and the like.
A reflective polymeric body of 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 30% of light incident on said body is reflected, where the intensity of the reflected light is governed by the equation R=(kr)/(1+(k-1)r).times.100, where R is the amount of reflected light (%), k is the number of thick film layers, and r=(N.sub.1 -N.sub.2)/(N.sub.1 +N.sub.2).sup.2, and N.sub.1 and N.sub.2 are the refractive indices of said polymeric materials at each layer interface, a substantial majority of the individual layers of said body having an optical thickness of at least 0.45 micrometers, and wherein said 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 alternating layers of said first and second polymeric materials such that at least 30% of light incident on said body is reflected, but such that essentially no visibly perceived iridescence is reflected, a substantial majority of the individual layers of said body having an optical thickness of at least 0.45 micrometers, and wherein said first and second polymeric materials differ from each other in refractive index by at least about 0.03.
The reflective polymeric body of claiim 21 in which said body includes a permanent protective skin layer on at least one major surface thereof.
A mirror like polymeric article having at least first and second major surfaces, said article comprising a sufficient number of alternating layers of first and second polymeric materials such that at least 30% of light incident on said body is reflected, a substantial majority of the individual layers of said body having an optical thickness of at least 0.45 micrometers, wherein said first and second polymeric materials differ from each other in refractive index by at least about 0.03, and wherein one of said major surfaces includes a light absorbent layer.
A mirror like polymeric article having at least first and second major surfaces, said article comprising a sufficient number of alternating layers of first and second polymeric materials such that at least 30% of light incident on said body is reflected, and at least one interior light absorbing layer, a substantial majority of the individual layers of said body having an optical thickness of at least 0.45 micrometers, and wherein said first and second polymeric materials differ from each other in refractive index by at least about 0.03.
A birefringent light polarizer which reflects light anisotropically, comprising multiple layers of at least first and second diverse polymeric materials, a substantial majority of the individual layers of said polarizer having an optical thickness of at least 0.45 micrometers, and 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.