METHOD OF PREPARING PHOTOCHROMIC-DICHROIC FILMS HAVING REDUCED OPTICAL DISTORTION
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United States of America Patent
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Issued Date -
Sep 18, 2014
app pub date -
Mar 13, 2013
filing date -
Mar 13, 2013
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Abstract
The present invention relates to a method of preparing a photochromic-dichroic film that includes a photochromic-dichroic layer. The method includes forming a molten thermoplastic photochromic-dichroic composition that includes a thermoplastic polymer and a photochromic-dichroic compound. Optionally at least one further molten thermoplastic composition is formed, each of which independently includes a further thermoplastic polymer. A molten stream is formed that includes a first molten layer composed of the molten thermoplastic photochromic-dichroic composition, and at least one further molten layer, each of which is independently composed of a further molten thermoplastic composition. The molten stream is passed between a rotating roll and a continuous belt that move in the same relative direction. A photochromic-dichroic film having reduced/minimal optical distortion is obtained (e.g., continuously) from between the rotating roll and the continuous belt.
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