Elastomeric optical interference films
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United States of America Patent
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Jun 26, 1990
Grant Date -
N/A
app pub date -
Apr 17, 1989
filing date -
Apr 17, 1989
priority date (Note) -
Expired
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Abstract
The present invention provides improved elastomeric interference films which are readily coextruded, have improved transparency, and have greater mismatches of refractive indices than those of the prior art. An improved elastomeric optical interference film comprising at least 100 alternating layers of at least first and second divergent substantially transparent elastomeric polymeric materials is provided. Adjacent layers of the first and second polymeric materials differ from each other in refractive index by at least about 0.05, and the thickness of the layers is from about 0.05 to about 0.5 micrometers. Stretching the films results in different wavelengths of light being reflected.
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