# US 5,708,181 A · Spiropyran compound

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- Number: US 5,708,181 A
- Document ID: US5708181A
- Status: Granted
- Kind: A
- Application number: 08/532,802
- Filed: 1995-11-08
- Granted: 1998-01-13
- Earliest claimed: 1994-03-11
- Assignees: Otsuka Kagaku Kabushiki Kaisha
- Inventors: Hiroshi Hama; Shinji Nakano
- Web page: https://patentgrep.com/patent/US5708181A

## CPC

- C07D 517/10: Spiro-condensed systems
- C09K 9/02: Organic tenebrescent materials
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## 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.

## Claims

### Claim 1

A salt of a spiropyran compound and an acidic compound, the spiropyran compound being represented by the formula ##STR5## 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 and R.sup.4 are the same or different and each mean a hydrogen atom, a C.sub.1 to C.sub.6 alkyl group, an aryl group, an aralkyl group, a C.sub.1 to C.sub.5 alkoxy group, a halogen atom, a cyano group, a trichloromethyl group, a trifluoromethyl group or a nitro group, R.sup.3 and R.sup.5 are the same or different and each mean a hydrogen atom, a C.sub.1 to C.sub.6 alkyl group, an aryl group, an aralkyl group, a C.sub.1 to C.sub.5 alkoxy group, a halogen atom, a cyano group, a trichloromethyl group, a trifluoromethyl group, a nitro group, an amino group, a dimethylamino group or a diethyl amino group, R.sup.6 and R.sup.7 are the same or different and each mean a hydrogen atom, a C.sub.1 to C.sub.6 alkyl group, an aryl group, an aralkyl group, a halogen atom, a cyano group or a nitro group, 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.

### Claim 2 (depends on 1)

The salt of a spiropyran compound and an acidic compound as defined in claim 1 wherein R.sup.1 means a methyl group, an ethyl group, a n-propyl group, a n-octadecyl group, a hydroxyethyl group or a methacryloxyethyl group, R.sup.2 means a hydrogen atom, R.sup.3 means a hydrogen atom, a methyl group, a methoxy group, a nitro group, an amino group, a dimethylamino group or a diethylamino group, R.sup.4 means a hydrogen atom, a methyl group or a methoxy group, R.sup.5 means a hydrogen atom, a nitro group, an amino group, a dimethylamino group or a diethylamino group, R.sup.6 and R.sup.7 each mean a hydrogen atom, R.sup.8 means a hydrogen atom, a vinyl group, a hydroxymethyl group or a methacryloxymethyl group, and X means an oxygen atom or a sulfur atom.