	US 11,951,649 B2
	Method for producing copper carboxylate, a wood preservative composition comprising copper carboxylate, and a wood product produced therefrom
Md Sayful Islam, Peachtree City, GA (US); and Jun Zhang, Peachtree City, GA (US)
Assigned to Koppers Performance Chemicals, Inc., Pittsburgh, PA (US)
Filed by Koppers Performance Chemicals, Inc., Pittsburgh, PA (US)
Filed on Jun. 30, 2022, as Appl. No. 17/854,196.
Application 17/854,196 is a continuation of application No. PCT/US2021/064126, filed on Dec. 17, 2021.
Claims priority of provisional application 63/143,396, filed on Jan. 29, 2021.
Prior Publication US 2022/0332008 A1, Oct. 20, 2022
Int. Cl. B27K 3/22 (2006.01); C07C 51/41 (2006.01)

CPC B27K 3/22 (2013.01) [C07C 51/412 (2013.01)]

28 Claims

1. A method for producing copper carboxylate, the method comprising:

combining a hydrocarbon solvent and a copper compound to form an intermediate mixture, wherein the hydrocarbon solvent comprises a flash point in a range of 58 degrees Celsius to 140 degrees Celsius;

heating a carboxylic acid having at least 8 carbon atoms to a temperature of at least 30 degrees Celsius to form a heated carboxylic acid; and

combining the intermediate mixture and the heated carboxylic acid to form a reaction product comprising

copper carboxylate, wherein an elemental copper concentration is in a range of 2 percent to 12 percent based on a total weight of the reaction product; and

at least 20 percent by weight hydrocarbon solvent based on the total weight of the reaction product.