US 11,053,170 B2
Liquid urease inhibitor formulations
Filip Colpaert, Zwijnaarde (BE); Francois Ledoux, Cormeilles en Parisis (FR); and Ruud Van Belzen, Middelburg (NL)
Assigned to YARA INTERNATIONAL ASA, Oslo (NO)
Appl. No. 16/75,695
Filed by YARA INTERNATIONAL ASA, Oslo (NO)
PCT Filed Feb. 24, 2017, PCT No. PCT/EP2017/054397
§ 371(c)(1), (2) Date Aug. 6, 2018,
PCT Pub. No. WO2017/144698, PCT Pub. Date Aug. 31, 2017.
Claims priority of application No. 16157221 (EP), filed on Feb. 24, 2016.
Prior Publication US 2019/0039962 A1, Feb. 7, 2019
Int. Cl. C05C 9/00 (2006.01); C05G 3/90 (2020.01); C05G 5/20 (2020.01)
CPC C05C 9/005 (2013.01) [C05G 3/90 (2020.02); C05G 5/20 (2020.02)] 24 Claims
OG exemplary drawing
 
1. A method for the manufacture of a liquid composition essentially consisting of propylene glycol (PG), optionally diethylene glycol monomethyl ether (DEGMME), diethylene glycol monobutyl ether (DEGMBE), or combinations thereof, and a urease inhibitor of the type phosphoric triamide, and optionally a dye system, the method comprising the step of heating an amount of propylene glycol (PG) to a first temperature at least above 20° C. but below the melt temperature of said urease inhibitor of the type phosphoric triamide, and subsequently adding an amount of solid urease inhibitor of the type phosphoric triamide in said amount of propylene glycol (PG) at a second temperature which is at most about equal to the first temperature, characterized in that the method comprises the step of
i) maintaining the liquid composition essentially consisting of propylene glycol (PG), optionally diethylene glycol monomethyl ether (DEGMME), diethylene glycol monobutyl ether (DEGMBE), or combinations thereof, and a urease inhibitor of the type phosphoric triamide, and optionally a dye system, at a third temperature, which temperature is greater than the first temperature, in the range of 60 to 80° C., wherein the crystallization temperature of the urease inhibitor of the type phosphoric triamide in said propylene glycol (PG) is less than 0° C.