MAGNETIC SHEET COMPOSITION, MAGNETIC SHEET, AND METHOD FOR PRODUCING MAGNETIC SHEET

1 . A magnetic sheet composition, comprising:

a binder;

magnetic powder; and

a curing agent,

wherein the binder contains a thermosetting organic resin, and the curing agent contains a sulfonium borate complex expressed by General Formula 1:

where R 1 is an aralkyl group, R 2 is a lower alkyl group, X is a halogen atom, and n is an integer of 0 to 3.

2 . The magnetic sheet composition according to claim 1 , wherein R 1 is a benzyl group, an o-methyl benzyl group, or a (1-naphthyl)methyl group.

3 . The magnetic sheet composition according to claim 1 , wherein R 2 is a methyl group.

4 . The magnetic sheet composition according to claim 1 , wherein the sulfonium borate complex is contained in an amount of 2 parts by mass to 15 parts by mass relative to 106.1 parts by mass of the binder.

5 . The magnetic sheet composition according to claim 1 , further comprising a flame retardant, wherein the flame retardant contains carboxylic acid amide-containing melamine cyanurate.

6 . A method for producing a magnetic sheet, comprising:

applying a magnetic sheet composition onto a substrate;

drying the magnetic sheet composition applied onto the substrate; and

thermosetting the dried magnetic sheet composition,

wherein the magnetic sheet composition comprises:

a binder;

magnetic powder; and

a curing agent,

wherein the binder contains a thermosetting organic resin, and the curing agent contains a sulfonium borate complex expressed by General Formula 1:

where R 1 is an aralkyl group, R 2 is a lower alkyl group, X is a halogen atom, and n is an integer of 0 to 3.

7 . The method for producing a magnetic sheet according to claim 6 , further comprising:

stacking a convex-concave forming layer and a pattern transferring layer on a surface of a magnetic layer, which is formed by thermosetting the magnetic sheet composition, in this order from the side of the magnetic layer so as to form a stacked body; and

hot-pressing the stacked body so as to transfer a surface configuration of the pattern transferring layer to surfaces of the convex-concave forming layer and the magnetic layer, as well as bonding the convex-concave forming layer and the magnetic layer together.

8 . A magnetic sheet, obtained by the method comprising:

applying a magnetic sheet composition onto a substrate;

drying the magnetic sheet composition applied onto the substrate; and

thermosetting the dried magnetic sheet composition,

wherein the magnetic sheet composition comprises:

a binder;

magnetic powder; and

a curing agent,

wherein the binder contains a thermosetting organic resin, and the curing agent contains a sulfonium borate complex expressed by General Formula 1:

where R 1 is an aralkyl group, R 2 is a lower alkyl group, X is a halogen atom, and n is an integer of 0 to 3.