Title:
COATING COMPOSITION FOR ELECTROMAGNETIC STEEL SHEETS, SURFACE-COATED ELECTROMAGNETIC STEEL SHEET FOR ADHESION, AND LAMINATED IRON CORE
Document Type and Number:
WIPO Patent Application WO/2021/256535
Kind Code:
A1
Abstract:
Provided is a coating composition for electromagnetic steel sheets, the coating composition containing an epoxy resin, a high-temperature curable crosslinking agent, and inorganic fine particles, wherein the content of the high-temperature curable crosslinking agent is 5-30 parts by mass with respect to 100 parts by mass of the epoxy resin, the inorganic fine particles are formed of at least one selected from among a metal hydroxide, a metal oxide that reacts with water at 25°C to form a metal hydroxide, and a silicate mineral having a hydroxyl group, the inorganic fine particles have a volume average particle size of 0.05-2.0 μm, the content of the epoxy resin is at least 45 mass% with respect to the total mass of the coating composition for electromagnetic steel sheets, and the content of the inorganic fine particles is 1-100 parts by mass with respect to 100 parts by mass of the epoxy resin.
Inventors:
TAKEDA KAZUTOSHI (JP)
TANAKA ICHIRO (JP)
FUKUCHI MINAKO (JP)
TAKATANI SHINSUKE (JP)
YAMAZAKI SHUICHI (JP)
TANAKA ICHIRO (JP)
FUKUCHI MINAKO (JP)
TAKATANI SHINSUKE (JP)
YAMAZAKI SHUICHI (JP)
Application Number:
PCT/JP2021/023038
Publication Date:
December 23, 2021
Filing Date:
June 17, 2021
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B32B27/18; B32B15/092; B32B15/18; B32B27/26; B32B27/38; C09D7/61; C09D7/63; C09D163/00; H01F1/147; H01F3/02; H01F27/245
Foreign References:
| JP2018518591A | 2018-07-12 | |||
| JPS5237934A | 1977-03-24 | |||
| US20070087201A1 | 2007-04-19 | |||
| JP2020104244A | 2020-07-09 | |||
| JP2008518087W | ||||
| JP2016540901W | ||||
| JP2018518591W |
Other References:
See also references of EP 4169713A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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