Process for producing a modified lignocellulosic material
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United States of America Patent
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Jun 18, 2002
Grant Date -
N/A
app pub date -
Nov 13, 2000
filing date -
Mar 18, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process of chemically modifying wood by impregnating the wood, under vacuum, with ammonia gas; after removal of residual ammonia, and while under pressure, impregnating the ammonia gas impregnated wood with an impregnating composition containing dicarboxylic or tricarboxylic anhydride, partly or fully saponified polyvinyl alcohol and water. The impregnating composition may further and, preferably, include a water-soluble boron compound, such as sodium borate. In the latter case, the boron is resistant to leaching.
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