| 摘要 |
A polymeric material comprising main chain ether groups or side chain alkoxylated groups that is effective as a carrier of photochromic additives. The polymeric material preferably has a glass trnsition temperature of at least 125 degree F and a cross link density of 2 to 8 moles per liter, more preferably 2.5 to 6 moles per liter. When photochromic additives are incorporated in such materials, the speed of switching is maintained at a high level, while the level of photochromic response is rendered relatively insensitive to temperature changes. Examples of optical products into which such materials can be incorporated include ophthalmic lenses, goggles, safety glasses, windows, and windshields.
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