US 11,998,946 B2
Method for producing lacquer-coated electrical strips, and lacquer-coated electrical strip
Bernhard Strauss, Leonding (AT); Ronald Fluch, Linz (AT); and Roman Tiefenthaller, Linz (AT)
Assigned to VOESTALPINE STAHL GMBH, Linz (AT)
Appl. No. 17/251,662
Filed by voestalpine Stahl GmbH, Linz (AT)
PCT Filed Jun. 14, 2019, PCT No. PCT/EP2019/065678
§ 371(c)(1), (2) Date Dec. 11, 2020,
PCT Pub. No. WO2019/238925, PCT Pub. Date Dec. 19, 2019.
Claims priority of application No. 10 2018 209 553.1 (DE), filed on Jun. 14, 2018.
Prior Publication US 2021/0162454 A1, Jun. 3, 2021
Int. Cl. B05D 1/28 (2006.01); B05D 3/10 (2006.01); B05D 7/14 (2006.01); C09D 129/04 (2006.01); H01B 13/06 (2006.01); C08K 3/32 (2006.01)
CPC B05D 1/28 (2013.01) [B05D 3/102 (2013.01); B05D 7/14 (2013.01); C09D 129/04 (2013.01); H01B 13/065 (2013.01); C08K 3/32 (2013.01); C08K 2003/329 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A process for producing a coated electrical steel strip, comprising:
application of a pretreatment layer over a first flat side of a rolled electrical steel strip, where a layer thickness of the pretreatment layer is in a range from 10 nm to 100 nm; and
after application of the pretreatment layer, coating of the rolled electrical steel strip with an insulating lacquer layer over the pretreatment layer, the insulating lacquer layer being applied by roll application using a roll, and without deliberate drying and/or crosslinking of the pretreatment layer being carried out after application of the pretreatment layer and before coating with the insulating lacquer layer, wherein the pretreatment layer consists
from 1.0% by weight to 5.0% by weight or 1.5% by weight to 3.0% by weight, of polyvinyl alcohol,
from 0.01% by weight to 0.5% by weight, or from 0.05% by weight to 0.3% by weight, of phosphoric acid, and
a remaining balance of an organic or inorganic solvent and/or water.