Lignin-based glue
US4292216A · kind A · utility
2Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1979 |
| Grant date | Sep 29, 1981 |
| Priority date | — |
| Expiry date | Dec 11, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09J197/005
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A glue, substantially based on chlorolignin, for gluing cellulose materials such as wood, particle board etc. Chlorolignin, which is a waste product from the cellulose industry, is an environmentally dangerous substance. It is recovered by membrane filtering of waste liquor, separating out compounds with a molecular weight lower than 1000-2000. It is then used alone, or mixed with common synthetic glues such as melamine-formaldehyde resins, fillers, hardeners etc. Formaldehyde, paraldehyde or ammonium chloride are suitable hardeners and the chlorolignin can also be prepolymerized with formaldehyde and/or paraldehyde.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.