Indolium compound and optical recording material
US8188297B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2007 |
| Grant date | May 29, 2012 |
| Priority date | — |
| Expiry date | Sep 5, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/2495
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An indolium compound is represented by formula (I):Ring A: a benzene or naphthalene ring. Ring B: 5- or 6-membered heterocyclic or aromatic ring. Z: alkyl group having 1-8 carbon atoms, may be substituted with a halogen atom or interrupted by —O—, —CO—, —OCO—, or —COO—, a sulfonyl group having a hydrocarbyl group having -8 carbon atoms, a sulfinyl group having a hydrocarbyl group having 1-8 carbon atoms, an alkylamino group having an alkyl group having 1-8 carbon atoms, a dialkylamino group having alkyl groups having 1-8 carbon atoms, a cyano group, a nitro group, a hydroxyl group, or a halogen group. R1: group represented by formula (II) or (II′). R2: organic group having 1-30 carbon atoms or group represented by formula (II), (II′), or (III). Y: group represented by formula (III). n: integer 0-4; Anm−: m-valent anion, m is 1 or 2. p: coefficient for neutral charge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.