Coloring composition containing an aromatic compound and an initiator
US8231689B2 · kind B2 · utility
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1References
18Claims
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Key dates
| Filing date | Nov 15, 2010 |
| Grant date | Jul 31, 2012 |
| Priority date | — |
| Expiry date | Nov 15, 2030 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q5/10
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A natural coloring composition for coloring materials, and methods of its use. The coloring composition comprises a natural precursor aromatic ring molecule such as L-DOPA that is oxidatively oligomerized or polymerized in the presence of an activator, such as a salt or an enzyme, to form colored compounds that dye a material. The natural coloring composition can also include a buffer, colorant, stabilizer, and/or thickening agent, and can comprise one or two inactive solutions that are combined to form an active coloring composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.