Polymeric compositions and articles with anisotropic light scattering and methods of making and using
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United States of America Patent
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Apr 27, 2004
Grant Date -
Nov 7, 2002
app pub date -
Jan 17, 2001
filing date -
Jan 17, 2001
priority date (Note) -
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Abstract
A polymeric composition includes a first polymeric material, for example, an adhesive material, and a second polymeric material disposed as a plurality of elongated structures within the first polymeric material. Each elongated structure has a major axis and the major axes are substantially aligned. The first polymeric material has an index of refraction that differs by at least 0.01 from an index of refraction of the second polymeric material. In some instances, a pressure sensitive adhesive material is selected as the first polymeric material. The orientation of the elongated structures and the difference in indices of refraction results in the polymeric composition scattering light asymmetrically. The polymeric composition is optionally disposed on a substrate and can be used, for example, to extract light from a light guide or to asymmetrically alter the viewing angle of a display.
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