Wood preservatives

US6362370B1 · kind B1 · utility

Assignee

• LONZA LTD · CH

Inventors

• Florian Lichtenberg · Grenzach, DE
• Joachim Fritschi · Lörrach, DE
• Volker Ranft · Murg, DE

Key dates

• Filing date: Sep 6, 2000
• Grant date: Mar 26, 2002
• Expiry date: Sep 6, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S424/11
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Wood preservatives having biocidal properties which include quaternary ammonium compounds of general formula (I): wherein R1 is a C8-18-alkyl group or an optionally substituted benzyl group, R2 is a C8-18-alkyl group, R3 is a C1-4-alkyl group or a group of the formula —[CH2—CH2—O]n—H, R4 is a C1-4-alkyl group, n is a number from 0.5 to 8, preferably from 1 to 5, and A31 is the anion of an organic carboxylic acid which contains 2 to 12 C atoms and carries at least one hydroxyl, amino or sulfonic acid group. The wood preservatives also penetrate deeply into the wood without the use of pressure, and have only a mild corrosive action on metals. Furthermore, a process for treating timbers with these compositions, concentrates for the preparation thereof, the use of new and known quaternary ammonium compounds in wood preservatives and new quaternary ammonium compounds and their use as biocides.