Broadband infrared and signature control materials and methods of producing the same
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United States of America Patent
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Sep 11, 2001
Issued Date -
N/A
app pub date -
Dec 30, 1997
filing date -
Aug 13, 1993
priority date (Note) -
Expired
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Abstract
Thin multilayer signature control films having a large differential between the indices of refraction of adjoining layers are characterized by the use as the low index layer or layers of a material having a high coefficient of extinction and a very low index of refraction. The enhanced differential between the indices of refraction results in signature control materials which, in one embodiment, may be comprised of just a substrate and a coating and, in another embodiment, may be a supported or unsupported multilayer film comprised of as few as three layers that have performance characteristics equal to or exceeding prior art films comprised of 15-30 layers. Both continuous films and pigmented liquid coating compositions for signature control are provided. Improved pigments for liquid coating compositions are comprised of appropriately coated microspheres and microballoons.
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