METHOD FOR PRODUCING ELECTROMAGNETIC STEEL SHEET WITH ADHESIVE INSULATING COATING FILM AND METHOD FOR PRODUCING STACKED ELECTROMAGNETIC STEEL SHEET

WIPO Patent Application WO/2018/116881

A1

Provided is a method for producing an electromagnetic steel sheet with an adhesive insulating coating film, said steel sheet having excellent adhesion at high temperatures and excellent oil resistance at high temperatures, while having excellent magnetic characteristics (iron loss and magnetic flux density) at the same time even after the stacking and strain relieving annealing. A method for producing an electromagnetic steel sheet with an adhesive insulating coating film, in which a coating agent that contains (a) an aqueous epoxy resin, (b) a high-temperature curable crosslinking agent in an amount of 30 parts by mass or less relative to 100 parts by mass of the aqueous epoxy resin in terms of solid content, (c) metal oxide particles and (d) a solvent is applied to at least one surface of an electromagnetic steel sheet and is subsequently baked under such conditions that the highest temperature reached by the steel sheet is 150°C or more but less than 230°C.

NAKAGAWA NOBUKO (JP)
MURAMATSU NAOKI (JP)
TADA CHIYOKO (JP)

PCT/JP2017/044322

June 28, 2018

December 11, 2017

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JFE STEEL CORP (JP)

C23C26/00; B32B15/092; H01F1/147

WO2015029828A1

2015-03-05

JPH07336969A	1995-12-22
JPH06330231A	1994-11-29
JPH07201551A	1995-08-04
JP2000173815A	2000-06-23
JPS5129573B2	1976-08-26

See also references of EP 3561153A4

SUGIMURA Kenji (JP)

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