Protecting wood with stabilized boron complexes

Patent metadata

Field	Value
Publication number	US-9414598-B2
Application number	US-95006107-A
Country	US
Kind code	B2
Filing date	Dec 4, 2007
Priority date	Dec 5, 2006
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

Wood is treated to reduce or prevent biodeterioration using boron compounds. A significant portion of the active boron is retained within the wood when leached. Boric acid is complexed with water-soluble bifunctional polyhydroxyl aromatic compounds, and the boric acid bifunctional polyhydroxyl aromatic complex is deposited into wood treated with a silicate. The complexing agents comprise polyfunctional compounds, including at least two hydroxyl groups, and one or more separate acid groups.

First claim

We claim:

1. A method for protecting wood; said method comprising treating the wood with a silicate, boric acid, and a complexing agent; wherein
c. the complexing agent comprises chromotropic acid (4,5-dihydroxy-2,7-naphthalenedisulfonic acid).

2. The method as in claim 1 , wherein said treating occurs at a pH below about 10.

3. The method as in claim 1 , wherein no external sealant is applied to the wood.

4. The method as in claim 1 , wherein the silicate is associated with a cation selected from the group consisting of Li + , Na + , K + , Rb + , Mg 2+ , Ca 2+ , NH 4 + , and other monovalent and divalent cations.

5. The method as in claim 1 , wherein said treating sufficiently binds boron to the wood that at least about 40% of the boron atoms will remain in the wood after the wood is subjected to 14 days of aqueous leaching.

6. A treated wood product comprising wood treated with a silicate, boric acid, and a complexing agent; wherein
c. said complexing agent comprises chromotropic acid (4,5-dihydroxy-2,7-naphthalenedisulfonic acid).

7. The treated wood as in claim 6 , wherein said treated wood has a pH below about 10.

8. The treated wood as in claim 6 , wherein said treated wood has no external sealant.

9. The treated wood as in claim 6 , wherein said silicate is associated with a cation selected from the group consisting of Li + , Na + , K + , Rb + , Mg 2+ , Ca 2+ , NH 4 + , and other monovalent and divalent cations.

10. The treated wood as in claim 6 , wherein said treating sufficiently binds boron to said wood that at least about 40% of the boron atoms will remain in the wood after the wood is subjected to 14 days of aqueous leaching.

11. A wood product comprising a product selected from the group consisting of lumber, paper, particle board, plywood, oriented strand board, parallel strand lumber, laminated veneer lumber, glue laminated lumber, hardboard and fiberboard, wherein said wood product comprises the treated wood as in claim 6 .

Assignees

• Obanda Diana N
• Shupe Todd F
• Univ Louisiana State

Inventors

• Obanda Diana N
• Shupe Todd F

Classifications

• B27K3/15

  Impregnating involving polymerisation {including use of polymer-containing impregnating agents (macromolecular compounds derived from lignocellulosic materials C08H; compositions of lignin-containing materials C08L97/02)} · CPC title

• A01N59/14

  Boron; Compounds thereof · CPC title

• Y10T428/662

  Wood timber product [e.g., piling, post, veneer, etc.] · CPC title

• C08L83/02

  Polysilicates · CPC title

• C08L97/02

  Lignocellulosic material, e.g. wood, straw or bagasse {(manufacture of articles made from lignocellulosic material by dry processes B27N)} · CPC title