ELECTRICAL STEEL SHEET COATING COMPOSITION, ELECTRICAL STEEL SHEET, LAMINATED CORE AND ELECTRIC MOTOR Russian patent published in 2023 - IPC C09D163/00 C23C22/00 C09D201/00 B32B15/92 H02K1/04 H01F1/18 H01F27/245 

FIELD: electrical machines.

SUBSTANCE: invention relates to a coating composition for an electrical steel sheet, to an electrical steel sheet, a laminated core and a electric motor. The coating composition comprises an epoxy resin, an epoxy resin latent hardener, and a thermoplastic elastomer, the thermoplastic elastomer having a melting point of 100°C or higher and 200°C or lower and a flexural modulus of more than 5 MPa and 100 MPa or less, and wherein the amount of thermoplastic elastomer per 100 mass parts of the total amount of epoxy resin and the epoxy latent hardener is 10 mass parts or more and less than 40 mass parts.

EFFECT: invention provides for obtaining a coating composition for an electrical steel sheet, which makes it possible to achieve both the magnetic properties of a laminated core and heat resistance, in which the adhesive strength between electrical steel sheets can be maintained even in a high-temperature state during movement, which is important for use in an electric motor.

6 cl, 7 dwg, 2 tbl