Photochromic annelated naphthopyrane systems with special substituents, for attaining rapid lightening speeds
The present invention relates to new photochromic, fused naphthopyran systems having specific substituents R1, which can be used to attain very rapid lightening speeds, without detriment to the depth of darkening after excitation, and also to the use thereof in plastics of all kinds.
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| Format: | Patent |
| Sprache: | eng ; heb |
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| Zusammenfassung: | The present invention relates to new photochromic, fused naphthopyran systems having specific substituents R1, which can be used to attain very rapid lightening speeds, without detriment to the depth of darkening after excitation, and also to the use thereof in plastics of all kinds. |
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