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August 9, 2005
By: KERRY PIANOFORTE
Patent No. U.S. 6,268,055 Photochromic polyacid-cured epoxy coatings for optical use have been patented by PPG Industries Ohio Inc. The coatings have a specified hardness and darken in color on irradiation with UV light. The coatings are obtained from a composition containing epoxy resin, a polyacid curing agent, a photochromic compound and a basic catalyst. A non-tintable hardcoat may be used as the primer. Coated substrates are claimed in this patent.
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