Spiropyran compound
US5708181A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1995 |
| Grant date | Jan 13, 1998 |
| Priority date | — |
| Expiry date | Nov 8, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D517/10
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An object of the present invention is to provide a novel compound which is suitably usable as a photochromic material. The compound of the present invention is a salt of a spiropyran compound and an acidic compound, the spiropyran compound being represented by the formula ##STR1## wherein R.sup.1 means a C.sub.1 to C.sub.20 alkyl group, an aralkyl group, a hydroxyethyl group, an acryloxyethyl group or a methacryloxyethyl group, R.sup.2 to R.sup.7 each mean a hydrogen atom, a C.sub.1 to C.sub.6 alkyl group or the like, R.sup.8 means a hydrogen atom, a vinyl group, a group --CH.sub.2 OR.sup.9 or a group --CH.sub.2 OCOC(R.sup.10).dbd.CH.sub.2 (wherein R.sup.9 means a hydrogen atom or a C.sub.1 to C.sub.4 alkyl group and R.sup.10 means a hydrogen atom or a methyl group), and X means an oxygen atom or a sulfur atom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.