Method of stabilizing organic substrates against the action of light
US4239843A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1978 |
| Grant date | Dec 16, 1980 |
| Priority date | — |
| Expiry date | Oct 30, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/134
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The stability of organic substrates having an absorption maximum between 300 and 800 nm in wavelength can be improved by at least one compound represented by the formula (I); ##STR1## wherein M represents Cu, Co, Ni, Pd or Pt; X.sub.1, X.sub.2, X.sub.3 and X.sub.4 eachrepresents an oxygen or sulfur atom, R.sub.1 and R.sub.2 each represents an alkyl, an aryl, a cycloalkyl, an oxocyclalkyl or a heterocyclic group attached to the carbon atom on the chelate ring directly or through a divalent connecting group, R.sub.3 represents a hydrogen atom, an alkyl, an aryl, a cycloalkyl, an oxocycloalkyl or a heterocyclic group attached to the carbon atom on the chelate ring directly or through a connecting group whereby R.sub.1, R.sub.2 and R.sub.3 may be the same or different and R.sub.1 and R.sub.3 or R.sub.2 and R.sub.3 may combine with each other to form a 5-, 6- or 7- member ring structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.