High solids, low viscosity lignin solutions
US4306999A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 23, 1979 |
| Grant date | Dec 22, 1981 |
| Priority date | — |
| Expiry date | Nov 23, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09J197/005
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Lignin concentrate solutions with at least about 40% total solids, having viscosities not higher than 10,000 cps. at 25.degree. C. and comprising normally water-insoluble and phenol-insoluble Kraft lignin dissolved in solvents comprising phenol and water or phenol-water-sodium hydroxide or ammonia are provided. The concentrates contain lignin to phenol weight ratios of less than 70:30 and more than 40:60 and preferably 50:50, and optionally, 2 to 20%, based on the weight of lignin, of sodium hydroxide or ammonia. The concentrates are storable and suitable for shipment and may be employed as phenol extenders in applications normally using phenols. They are particularly tailored for use in replacement of 25% to 100% of the phenol component in the production of phenol/formaldehyde resins and, when so employed, provide phenol-lignin-formaldehyde (PLF) resins that are useful in the formulation of plywood adhesives.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.