EP 0262419 B1 19930512 - PROCESS FOR REMOVING ACIDS FROM CATAPHORETIC PAINTING BATHS
Title (en)
PROCESS FOR REMOVING ACIDS FROM CATAPHORETIC PAINTING BATHS
Publication
Application
Priority
DE 3629981 A 19860903
Abstract (en)
[origin: US4775478A] The present invention relates to a novel process for removing acids from cathodic electrocoating baths, in which electrically conductive substrates are coated with cationic resins present in the form of aqueous dispersions, part or all of the dip-coating bath being subjected to an ultrafiltration in which the ultrafiltration membrane retains the cationic resin and an ultrafiltrate is formed which contains water, solvent, low molecular weight substances and ions, and part or all of the ultrafiltrate being recycled to the coating bath, in which process (a) part or all of the ultrafiltrate, before recycling to the electrocoating bath and (b) an aqueous solution of an organic or inorganic base, which may or may not contain salts, are each introduced into one or more chambers, separated from one another by an anion exchange membrane, of an exchange cell, solutions (a) and (b) being led over the surface of the membrane.
IPC 1-7
IPC 8 full level
C25D 13/24 (2006.01)
CPC (source: EP US)
C25D 13/24 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0262419 A2 19880406; EP 0262419 A3 19890531; EP 0262419 B1 19930512; AT E89339 T1 19930515; DE 3629981 A1 19880317; DE 3785814 D1 19930617; JP S6362899 A 19880319; US 4775478 A 19881004
DOCDB simple family (application)
EP 87112627 A 19870829; AT 87112627 T 19870829; DE 3629981 A 19860903; DE 3785814 T 19870829; JP 21553587 A 19870831; US 9044587 A 19870828