LOW CURL OR CURL FREE OPTICAL FILM-TO-PAPER LAMINATE
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United States of America Patent
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Issued Date -
Jan 3, 2013
app pub date -
Jun 7, 2012
filing date -
Jun 28, 2011
priority date (Note) -
Abandoned
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Abstract
An optical film material suitable for use in low curl or curl free optical film-to-paper laminates is provided. The inventive optical film material includes a light-transmitting polymeric optical spacer or carrier film that has a linear coefficient of thermal expansion (CTE) of less than about 25×10−6 mm/mm-° C. over the temperature range of from about 70 to about 160° C., or that is hygroscopic (e.g., has an ambient moisture absorption, measured as a percentage moisture content, similar to paper), or both. Also provided is an optical film-to-paper laminate (e.g., a micro-optic film-to-passport paper laminate) that demonstrates a reduction in (or elimination of) curl. The inventive laminate exhibits a maximum out-of-plane deformation of less than about 10%.
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