David V Schubert

US Patent:

7497900, Mar 3, 2009

Filed:

Mar 31, 2005

Appl. No.:

11/547377

Inventors:

Yatao Hu - Malvern PA, US
Jason D. Lenox - Boyertown PA, US
Neil T. Miller - King of Prussia PA, US
David M. Schubert - Lone Tree CO, US

Assignee:

PQ Corporation - Berwyn PA
U.S. Borax Inc. - Greenwood Village CO

International Classification:

A01N 59/14
A01N 59/16

US Classification:

106 1832, 106 1505, 106 1812, 106 1836, 252385, 424641, 424DIG 11

Abstract:

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.

US Patent:

7547354, Jun 16, 2009

Filed:

Mar 31, 2005

Appl. No.:

11/547375

Inventors:

Yatao Hu - Malvern PA, US
Neil T. Miller - King of Prussia PA, US
David M. Schubert - Lone Tree CO, US

Assignee:

PQ Corporation - Berwyn PA
U.S. Borax Inc. - Greenwood Village CO

International Classification:

A01N 59/14
A01N 59/16

US Classification:

106 183, 106 1505, 106 1813, 424641, 424658, 424659, 424660, 424DIG 10, 424DIG 11

Abstract:

Compositions and methods are provided for treating wood products to provide leach-resistant protection against fungal decay, termites and other wood destroying organisms. The preservative compositions provided include ammonia-stabilized solutions of zinc and boron, preferably in a molar ratio of Zn:B of between about 0. 4:1 and 5:1, and are essentially copper free. The preservative may be applied by vacuum and/or pressure treatment or dip treatment under atmospheric pressure.