	US 12,227,850 B2
	Pickle for polyamide
Almedina Fetahovic, Solingen (DE)
Assigned to HSO Herbert Schmidt GmbH & Co. KG, Solingen (DE)
Appl. No. 18/281,990
Filed by HSO HERBERT SCHMIDT GmbH & Co. KG, Solingen (DE)
PCT Filed Mar. 28, 2022, PCT No. PCT/EP2022/058134 § 371(c)(1), (2) Date Sep. 14, 2023, PCT Pub. No. WO2022/207559, PCT Pub. Date Oct. 6, 2022.
Claims priority of application No. 21165510 (EP), filed on Mar. 29, 2021.
Prior Publication US 2024/0301557 A1, Sep. 12, 2024
Int. Cl. C23C 18/24 (2006.01); C09K 13/08 (2006.01); C23C 18/20 (2006.01); C23C 18/32 (2006.01)

CPC C23C 18/2073 (2013.01) [C09K 13/08 (2013.01); C23C 18/24 (2013.01); C23C 18/32 (2013.01)]

20 Claims

1. A process for pickling polyamide,

comprising the steps

a) contacting the polyamide with a pickling solution comprising

a mixture of at least two inorganic acids

MHF₂, where M is an alkali ion or an ammonium ion

a monocarboxylic acid with 1 to 5 carbon atoms

b) contacting with an organic solvent having 1 to 10 carbon atoms, wherein

steps a) and b) take place consecutively or simultaneously.