发明授权
US5808100A Chromene compounds and photochromic materials 失效
色烯化合物和光致变色材料

Chromene compounds and photochromic materials
摘要:
A photochromic compound which is initially colored less, exhibits excellent durability and features high color density and high color fading rate, and a photochromic material thereof. The photochromic compound basically has two aromatic heterocyclic groups or an aromatic heterocyclic group and a naphthyl group at the third position, and has a benzene ring that is condensed at the f-th position.
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