Photochromic articles and methods for making them
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United States of America Patent
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Issued Date -
Jul 8, 2004
app pub date -
Jan 9, 2004
filing date -
Nov 29, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention is directed to photochromic parts, objects, and articles and to methods for preparing them. The articles of the inventions have at least two layers, at least one of which is loaded with a photochromic dye. The layers are made of either the same or different materials. At least one of the layers is formed form a semi-solid polymerizable material, which comprises a reactive plasticizer and, optionally, a dead polymer, and, when used as the photochromic layer, further comprises a photochromic dye. The remaining layer(s) may be formed from liquid resins or additional semi-solid polymerizable materials.
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