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US 5,395,567 AGranted
Photochromic spironaphthopyran compounds
AssigneePPG Industries, Inc.
InventorsBarry Van Gemert, David B. Knowles
Life of this patent
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Abstract
A novel photochromic spironaphthopyran composition having the general structural formula: ##STR1## in which phenyl substituents positioned adjacent to the oxygen of the pyran ring are linked at their adjacent ortho positions by the functionality (R).sub.n wherein n is the integer 0-2 and wherein R is methylene (--CH.sub.2 --), vinylene (--C.dbd.C--), or a carbon-carbon bond, i.e., when n is 0. The groups R.sub.1 and R.sub.5 -R.sub.10 may be hydrogen or a variety of substituents.
Claims15
A spironaphthopyran representable by the graphic formula:
- ##STR6## wherein n is an integer of from 0 to 2, R is selected from methylene and vinylene when n is 1, is methylene when n is 2, and is a carbon-carbon bond when n is 0, R.sub.1 is hydrogen, C.sub.1 -C.sub.5 alkyl, C.sub.1 -C.sub.5 alkoxy or halogen, and R.sub.5 -R.sub.10 are each selected from hydrogen, C.sub.1 -C.sub.10 alkyl, C.sub.5 -C.sub.7 cycloalkyl, phenyl, mono- or di-substituted phenyl, C.sub.1 -C.sub.4 alkoxy, carboxy, C.sub.1 -C.sub.5 carboxyalkyl, acetoxy, benzyloxy, halogen, acrylyl, methacrylyl, acryloxy (C.sub.1 -C.sub.4) alkyl, or methacryloxy (C.sub.1 -C.sub.4) alkyl, said phenyl substituents being selected from C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, chloro and fluoro.
Dependencies are inferred from the claim text.