Photochromic compounds

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United States of America Patent

PATENT NO 6936725
APP PUB NO 20030045714A1
SERIAL NO

09819705

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A photochromic compound suitable for use as a single substance for photochromic tinting of a transparent plastic article so that the tinted article has a neutral gray or brown color in the excited state, is made by fusing at least two non-identical photochromic sections to an aromatic structure. The photochromic sections are selected so that the different absorption wavelengths of the excited photochromic sections give rise to a neutral gray or brown color in the plastic material and are selected from the group consisting of oxazines and pyrans. At least one of the photochromic sections is not an indolino spiropyran. The aromatic structure to which the photochromic sections are fused is selected from the group consisting of benzene, biphenyl, naphthalene, anthracene and phenanthrene. The positions of fusion of the photochromic sections on the aromatic structure are directly adjacent to the oxygen atom of the pyran or the oxygen or nitrogen atom of the oxazine.

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Patent Owner(s)

Patent OwnerAddress
RODENSTOCK GMBHELSENHEIMERSTR 33 MÜNCHEN 80687

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Melzig, Manfred Wessling, DE 42 566
Zinner, Herbert Pentling, DE 17 204

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