EP 0209940 B1 19901227 - PROCESS FOR APPLYING AN INSULATING LAYER
Title (en)
PROCESS FOR APPLYING AN INSULATING LAYER
Publication
Application
Priority
- DE 3525430 A 19850717
- DE 3539774 A 19851109
Abstract (en)
[origin: ES2000682A6] A process is disclosed for applying to sheet steel an electrically insulating layer which permits mainly a satisfactory welding of the sheets when they have been blanked and stacked. The sheet steel is contacted with a treating liquor which contains a resin that is adapted to be diluted in an alkaline aqueous medium and also contains a fluoride of a polyvalent metal, particularly aluminum fluoride, in an amount of 0.1 to 80 parts by weight per 100 parts by weight resin. The treating liquor is subsequently dried and the sheet is subjected to a stress-relieving annealing, if required. In preferred embodiments of the invention a treating liquor is employed which additionally contains borates and/or dispersed particles comprising silicate and/or polymers and which is applied by means of rollers and is dried at 120 DEG to 350 DEG C.
IPC 1-7
IPC 8 full level
B05D 5/12 (2006.01); C09D 5/25 (2006.01); H01F 1/18 (2006.01)
CPC (source: EP KR US)
Designated contracting state (EPC)
AT BE DE FR GB IT LU NL SE
DOCDB simple family (publication)
EP 0209940 A1 19870128; EP 0209940 B1 19901227; BR 8603362 A 19870224; CA 1286553 C 19910723; DE 3539774 A1 19870514; DE 3676582 D1 19910207; ES 2000682 A6 19880316; IN 165821 B 19900120; KR 870005412 A 19870608; US 4756933 A 19880712
DOCDB simple family (application)
EP 86201208 A 19860709; BR 8603362 A 19860717; CA 513891 A 19860716; DE 3539774 A 19851109; DE 3676582 T 19860709; ES 8600344 A 19860716; IN 530CA1986 A 19860715; KR 860005765 A 19860716; US 88654786 A 19860716