Copper-based fungicide/bactericide
The present invention discloses an improved copper-based fungicide/bactericide composition. The improved composition offers higher biological activity over typical copper-based products, while requiring significantly less copper in the composition. The present invention also discloses methods of making the improved copper-based fungicide/bactericide composition. The present invention further discloses methods of using the improved copper-based fungicide/bactericide composition.
1. A fungicide/bactericide composition consisting essentially of:
(a) a complex of copper and a citric acid derivative, in which the ratio of copper and citric acid is between 1:0.02 and 1:0.16 based on the weight of copper compound and citric acid derivative;
(c) a first dispersant, wherein said first dispersant is selected from the group consisting of a block copolymer non-ionic surfactant having an average molecular weight of between 1,000 and 15,000, a polyacrylic acid derivative having a pH of between 5 and 10 and an average molecular weight of between 1,000 and 37,000, and combinations thereof; and
(e) a second dispersant, wherein said second dispersant is selected from the group consisting of lignin sulfonate, naphthalene sulfonate and combinations thereof.
2. The composition of claim 1 wherein said citric acid derivative is sodium citrate.
3. The composition of claim 1 , wherein said complex is formed by the contact of said citric acid derivative with a copper compound selected from the group consisting of copper hydroxide, copper oxychloride, tribasic copper sulfate, basic copper carbonate and copper oxide.
4. The composition of claim 2 , wherein said complex is formed by the contact of sodium citrate with a copper compound selected from the group consisting of copper hydroxide, copper oxychloride, tribasic copper sulfate, basic copper carbonate and copper oxide.
5. The composition of claim 1 , wherein said complex is formed by the contact of said citric acid derivative with copper hydroxide.
6. The composition of claim 2 , wherein said complex is formed by the contact of sodium citrate with copper hydroxide.
7. The composition of claim 6 , wherein said first dispersant is a block copolymer non-ionic surfactant having an average molecular weight of between 1,000 and 15,000.
8. The composition of claim 6 , wherein said first dispersant is a sodium salt of polyacrylic acid.
9. The composition of claim 8 , wherein said first dispersant is a sodium salt of polyacrylic acid having a pH of between 9 and 10.8.
10. The composition of claim 6 , wherein said first dispersant is a combination of a block copolymer non-ionic surfactant having an average molecular weight of between 1,000 and 15,000 and a sodium salt of polyacrylic acid having a pH of between 9 and 10.8.
11. The composition of claim 6 , wherein said second dispersant is naphthalene sulfonate.
12. The composition of claim 11 , wherein said second dispersant is a sodium salt of naphthalene sulfonate.
13. The composition of claim 6 , further comprising a wetting agent, an antifoam agent and a stabilizer.
14. The composition of claim 13 , wherein said wetting agent is a fatty alcohol polyglycol non-ionic surfactant.
15. The composition of claim 13 , wherein said antifoam agent is a polydimethylsiloxane antifoam emulsion.
16. The composition of claim 1 , consisting essentially of the following ingredients: copper hydroxide, sodium citrate, a block copolymer non-ionic surfactant having an average molecular weight of between 1,000 and 15,000, a sodium salt of polyacrylic acid having a pH of between 9 and 10.8, diatomaceous earth, calcium carbonate, naphthalene sulfonate, a fatty alcohol polyglycol non-ionic surfactant, a polydimethylsiloxane antifoam emulsion and glycerol.