Lignin and lignin derivatives as copolymerizable colorants for polyesters
US4803255A · kind A · utility
20Cited by
2References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1987 |
| Grant date | Feb 7, 1989 |
| Priority date | — |
| Expiry date | Jun 22, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/46
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Colored shapable polyesters having copolymerized therein lignin or lignin derivatives are prepared by condensing the lignin or lignin derivatives into the polyester backbone during the polymerization reaction. The lignin moieties are thermally stable at the polymer processing temperatures and are nonextractable from the polyester backbone. These colored, shapable polyesters are particularly suitable for use in food, beverage, pharmaceutical, or cosmetic container applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.