US 11,879,093 B2
Corrosion-inhibiting surfactants
Maxime Feche, Grenoble (FR); Mathieu Pepin, Grenoble (FR); Elodie Shaw, Fontaine (FR); Laure Canal, Grenoble (FR); José Santiago, Limony (FR); Milan Bartos, Sugar Land, TX (US); and Alla Crabtree, Katy, TX (US)
Assigned to STEPAN COMPANY, Northfield, IL (US)
Appl. No. 17/622,678
Filed by STEPAN COMPANY, Northfield, IL (US)
PCT Filed Jul. 29, 2020, PCT No. PCT/IB2020/057170
§ 371(c)(1), (2) Date Dec. 23, 2021,
PCT Pub. No. WO2021/019470, PCT Pub. Date Feb. 4, 2021.
Claims priority of provisional application 62/879,726, filed on Jul. 29, 2019.
Prior Publication US 2022/0363977 A1, Nov. 17, 2022
Int. Cl. C09K 8/54 (2006.01); C23F 11/14 (2006.01)
CPC C09K 8/54 (2013.01) [C23F 11/141 (2013.01); C09K 2208/32 (2013.01)] 20 Claims
OG exemplary drawing
1. A method which comprises inhibiting corrosion of a metal surface that is exposed to an aqueous brine by treating the surface with a film-forming composition comprising a quaternary surfactant, wherein the surfactant is made by reacting a polyalkylene glycol (PAG), a haloalkanoic acid, and a tertiary fatty amine, and wherein the surfactant comprises a PAG monoester quat and a PAG diester diquat.