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US 11,839,994 B2Granted
Treatment of wood with aldehyde and isocyanate
AssigneeHeartwood Sustainable Industries Proprietary Limited
InventorsGoddeti Siva Mohan Reddy, Steven Chiuta, Tebogo Ankie Khoza
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Abstract
A method of treating wood includes subjecting the wood to a vacuum environment, and thereafter contacting the wood under positive pressure with an aldehyde and an isocyanate, both the aldehyde and the isocyanate being in liquid form.
Claims15
A method of treating wood to improve at least the hardness of the wood, the method including
- subjecting the wood to a vacuum environment;
- thereafter, contacting the wood under positive pressure for a period no more than 60 minutes with glyoxal and diphenylmethane-4,4′-diisocyanate, both the glyoxal and the diphenylmethane-4,4′-diisocyanate being in liquid form;
- reacting isocyanate functionalities with cell wall hydroxyl groups of the wood, forming carbamate esters;
- and
- acetalysing cellulose or cellulose ethers in the wood, forming cellulosic acetal.
2 more elements
Dependencies are inferred from the claim text.