Wood preservative composition and method of treating wood with same
US4950329A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1988 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Oct 11, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB27K3/32
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A wood preservative composition comprises a wood preservative such as a chromated copper arsenate-oil emulsion or an ammoniacal copper arsenate emulsion having about 0.1 to 15 percent chromated copper arsenate, ammoniacal copper arsenate, or ammoniacal copper zinc arsenate, about 1 to 20 percent oil and about 0.3 to 2.5 percent (based on total final emulsion) surfactant material. The first surfactant preferably has a hydrophilic lipophilic balance of about 7 to 9.5 and a second surfactant has a hydrophilic lipophilic balance of about 15 to 20. It is preferred that the first surfactant have an ethoxyl mole ratio less than about 5 and that the second surfactant have a mole ratio greater than about 15. The surfactant material may be composed of a first surfactant having an average mole ratio of about 1 to 5 and a second surfactant having an average mole ratio of about 20 to 100. The composition is storage stable for extended periods and provides a number of beneficial properties for wood products. A preferred group of surfactants for use in the present invention are ethoxylated alkylphenols or ethoxylated alkyl alcohols. A related method includes establishing an emulsion in oil of a f…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.