التفاصيل البيبلوغرافية
| العنوان: |
Two-Part Borate, Silicate and Zinc Compositions, and Methods for Treating Wood Products |
| Document Number: |
20080124478 |
| تاريخ النشر: |
May 29, 2008 |
| Appl. No: |
11/547377 |
| Application Filed: |
March 31, 2005 |
| مستخلص: |
Systems and methods are provided for treating products containing wood fibers to provide protection against wood destroying organisms and fire, and resistance against leaching of the preservative from the wood by water in exposed environments such as exterior applications. The methods involve applying to a substrate a first aqueous composition containing a boron compound, a source of zinc, and ammonia, followed by application of a second aqueous composition containing an alkali metal silicate. The compositions may be applied by vacuum and/or pressure treatment or dip treatment under atmospheric pressure. |
| Inventors: |
Hu, Yatao (Malvern, PA, US); Lenox, Jason D. (Boyertown, PA, US); Miller, Neil T. (King of Prussia, PA, US); Schubert, David M. (Lone Tree, CO, US) |
| Assignees: |
U.S. BORAX INC. (Valencia, PA, US), PQ CORPORATION (Berwyn, PA, US) |
| Claim: |
1. A preservative system comprising: (a) a first aqueous composition comprising a source of zinc selected from the group consisting of zinc oxide and soluble zinc salts; a source of borate selected from the group consisting of zinc borate, boric acid, boric oxide and water soluble borate salts; a source of ammonia; and water; wherein the composition comprises at least 50 wt % water; and (b) a second aqueous composition, separate from the first composition, comprising an alkali metal silicate and water. |
| Claim: |
2. The preservative system according to claim 1, wherein the first and second compositions are essentially chloride ion free. |
| Claim: |
3. The preservative system according to claim 1, wherein the first and second compositions are essentially copper-free. |
| Claim: |
4. The preservative system according to claim 1, wherein the source of ammonia is ammonium hydroxide, the source of zinc is zinc chloride, the source of borate is sodium borate, and the alkali metal silicate is sodium silicate. |
| Claim: |
5. The preservative system according to claim 1, wherein the source of borate is disodium octaborate tetrahydrate and the alkali metal silicate is sodium silicate having an SiO2:Na2O weight ratio greater than 3:1. |
| Claim: |
6. The preservative system according to claim 1, wherein the first aqueous composition comprises from about 0.1 to about 1.0 weight percent boron, from about 0.2 to about 2.5 weight percent zinc, and from about 1 to about 5 weight percent ammonia, and wherein the second aqueous composition comprises between about 1 and about 10 wt % SiO2. |
| Claim: |
7. The preservative system according to claim 1, wherein zinc and boron are present in the first aqueous composition in a mole ratio Zn:B between about 0.4:1 and 5:1. |
| Claim: |
8. The preservative system according to claim 1, wherein zinc and boron are present in the first aqueous composition in a mole ratio Zn:B between about 1:1 and 3:1. |
| Claim: |
9. The preservative system according to claim 1, wherein zinc and boron are present in the first aqueous composition in a mole ratio Zn:B between about 1.5:1 and 2:1. |
| Claim: |
10. The preservative system according to claim 1, wherein silicon in the second aqueous composition and boron in the first aqueous composition are present in a mole ratio Si:B between about 0.2:1 and 0.3:1. |
| Claim: |
11. The preservative system according to claim 1, wherein ammonia and zinc are present in the first aqueous composition in a mole ratio NH3:Zn between about 7:1 and 33:1. |
| Claim: |
12. A preservative system consisting of: (a) a first aqueous composition consisting essentially of a source of zinc selected from the group consisting of zinc oxide and soluble zinc salts; a source of borate selected from the group consisting of zinc borate, boric acid, boric oxide and water soluble borate salts; a source of ammonia; and water; wherein the composition is essentially copper-free and comprises at least 50 wt % water; and (b) a second aqueous composition, separate from the first composition, consisting essentially of an alkali metal silicate and water. |
| Claim: |
13. The preservative system of claim 12, wherein the first and second compositions are essentially copper-free. |
| Claim: |
14. A method for preserving an article comprising wood fibers, the method comprising the steps of: (a) applying to the article a first aqueous composition prepared by combining ingredients comprising: i) a source of zinc selected from the group consisting of zinc oxide and soluble zinc salts; ii) a source of borate selected from the group consisting of zinc borate, boric acid, boric oxide and water soluble borate salts; iii) a source of ammonia; and iv) water; such that the first aqueous composition penetrates into the wood fibers, wherein the composition comprises at least 50 wt % of water; (b) applying to the article a second aqueous composition comprising an alkali metal silicate and water; and (c) drying the wood fibers; such that there is deposited therein a bioeffective amount of a residual component comprising zinc, boron, and silicon. |
| Claim: |
15. The method of claim 14, wherein the first and second compositions are essentially copper-free. |
| Claim: |
16. The method of claim 14, wherein the bioeffective amount of the residual component is sufficient to deter attack on the article by termites. |
| Claim: |
17. The method of claim 14, wherein the bioeffective amount of the residual component is sufficient to deter attack on the article by wood-decay fungi. |
| Claim: |
18. The method of claim 14, wherein the drying step is performed at a temperature no higher than 90° C. |
| Claim: |
19. The method of claim 14, wherein the drying step is performed at a temperature between about 50° C. and about 70° C. |
| Claim: |
20. The method of claim 14, wherein the drying step is performed at ambient temperature. |
| Claim: |
21. The method of claim 14, wherein the article comprises wood. |
| Claim: |
22. The method of claim 14, wherein the article comprises wood pulp. |
| Claim: |
23. The method of claim 22, wherein the wood pulp is in the form of paper. |
| Claim: |
24. The method according to claim 21, wherein step (a) involves dip treating the article under atmospheric pressure. |
| Claim: |
25. The method according to claim 21, wherein step (a) involves application of one or both of vacuum and pressure to facilitate said penetration of the aqueous composition. |
| Claim: |
26. An article comprising wood fibers comprising a residual component comprising zinc, boron, and silicon, prepared by treating the wood fibers according to the method of claim 14. |
| Claim: |
27. A method of treating a substrate comprising wood fibers to provide resistance to flame spread, the method comprising the steps of: (a) applying to the article a first aqueous composition prepared by combining ingredients comprising: i) a source of zinc selected from the group consisting of zinc oxide and soluble zinc salts; ii) a source of borate selected from the group consisting of zinc borate, boric acid, boric oxide and water soluble borate salts; iii) a source of ammonia; and iv) water; such that the first aqueous composition penetrates into the wood fibers, wherein the composition is essentially copper-free and comprises at least 50 wt % of water; (b) applying to the article a second aqueous composition comprising an alkali metal silicate and water; and (c) drying the wood fibers; such that there is deposited therein a flame retardant amount of a residual component comprising zinc, boron, and silicon. |
| Claim: |
28. The method of claim 27, wherein the first and second compositions are essentially copper-free. |
| Current U.S. Class: |
427/440 |
| Current International Class: |
09; 05; 05 |
| رقم الانضمام: |
edspap.20080124478 |
| قاعدة البيانات: |
USPTO Patent Applications |