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US 7,252,706 B2Granted
Inhibition of calcium and magnesium precipitation from wood preservatives
AssigneePhibro-Tech, Inc.
InventorsH. Wayne Richardson, Gang Zhao
Life of this patent
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Abstract
A wood preservative that contains a copper salt complex and a precipitation inhibitor is provided. The wood preservative may contain copper carbonate, an alkanolamine such as monoethanolamine and precipitation inhibitor such as a phosphonate or ethylene diamine compound. Also provided is a method of using the wood preservative.
Claims17
A method of preserving wood comprising:
- contacting wood with an aqueous solution of a wood preservative composition comprising
- copper-amine complex;
- one or more alkaline earth metal ions;
- and
- a precipitation inhibitor selected from hydroxyethylidene-diphosphonic acid (HEDP) or a salt thereof;
- 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC) or a salt thereof;
- a compound having a plurality of phosphonate moieties, wherein the phosphorus atoms of the phosphonate moieties are separated by at least two carbon atoms, wherein the at least two carbon atoms are not linked to nitrogen atoms;
- a compound having at least one phosphonate moiety and one or more carboxylate moieties, wherein the phosphorus atom of the at least one phosphonate moiety and the one or more carboxylate moieties are separated by at least two carbon atoms;
- and mixtures thereof.
6 more elements
A wood preservative comprising:
- an aqueous solution of a copper salt, copper complex, or a mixture thereof;
- one or more alkaline earth metal ions;
- and
- hydroxyethylidene-diphosphonic acid (HEDP) or a salt thereof.
1 more element
A wood preservative comprising:
- an aqueous solution of a copper salt, copper complex, or a mixture thereof;
- one or more alkaline earth metal ions;
- and
- a precipitation inhibitor having at least one phosphonate moiety and one or more carboxylate moieties, wherein the phosphorus atom of the at least one phosphonate moiety and the one or more carboxylate moieties are separated by at least two carbon atoms.
1 more element
A wood preservative comprising:
- an aqueous solution of a copper salt, copper complex, or a mixture thereof;
- one or more alkaline earth metal ions;
- and a precipitation inhibitor having a plurality of phosphonate moieties, wherein the phosphorus atoms of the phosphonate moieties are separated by at least two carbon atoms, wherein the at least two carbon atoms are not linked to nitrogen atoms.
Dependencies are inferred from the claim text.