Water repellant for wood
US5200457A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1989 |
| Grant date | Apr 6, 1993 |
| Priority date | — |
| Expiry date | Jun 9, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB27K2240/70
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A composition and method is described for making wood and other porous articles water repellant. The composition is an aqueous acidic solution or an aqueous acidic emulsion of a polymeric ingredient and an aluminum halohydrate, preferably aluminum chlorohydrate which is dissolved in the solution or emulsion. The polymers which are useful in this invention are glyoxal-urea polymers and self-crosslinking acrylic polymers. The polymers are chemically reactive with the cellulose or other components in the wood under acidic conditions upon drying. Preferably, the composition avoids the presence of toxic chromium compounds and salts which can interfere with the effectiveness of the composition. The composition offers enhanced water repellency and resists leaching due to the combination of the resin with the aluminum halohydrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.