Polymeric bis-acetoacetanilide azo colorants
US6479648B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2001 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Nov 21, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B69/106
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This invention relates to colorants comprising a chromophore having two azo acetoacetanilide moieties, wherein said moieties each have at least one poly(oxyalkylene) chain, preferably at least two such chains. Such colorants exhibit extremely good base stability and lightfastness, particularly when incorporated within certain media and/or on the surface of certain substrates. These poly(oxyalkylene) chains provide solubility in different solvents or resins thereby permitting the introduction of such excellent coloring chromophores within diverse media and/or or diverse substrates. Compositions and articles comprising such colorants are provided as are methods for producing such inventive colorants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.