Indolino-spiroquinoxalino oxazine photochromatic compounds, methods for their preparation, photochromic compositions and articles containing such compounds
US5139707A · kind A · utility
57Cited by
7References
19Claims
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Key dates
| Filing date | Jun 5, 1990 |
| Grant date | Aug 18, 1992 |
| Priority date | — |
| Expiry date | Jun 5, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/685
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The new photochromic compounds of the invention have the formula of a indolino-spiro-oxazine comprising an indolinic part and an oxazine part wherein the oxanine part comprises an unsaturated 6-atoms bi-aza heterocycle of the pyrimidine type included in a nucleus of the quinazoline part. Preferred photochromic compounds are those showing the following developed formula (II) wherein PA0 R.sub.1 is a methyl or isopropyl group PA0 R.sub.2 and R.sub.3 are methyl groups PA0 R.sub.4 is H or --OCH.sub.3 ##STR1##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.