Magnetic sheet composition, magnetic sheet, and method for producing magnetic sheet

Abstract

To provide a magnetic sheet composition, which contains: 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.

What is claimed is: 
     
         1 . A method for preparing 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, and   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 method for preparing a magnetic sheet according to  claim 1 , wherein R 1  is a benzyl group, an o-methyl benzyl group, or a (1-naphthyl)methyl group. 
     
     
         3 . The method for preparing a magnetic sheet according to  claim 1 , wherein R 2  is a methyl group. 
     
     
         4 . The method for preparing a magnetic sheet according to  claim 1 , wherein the magnetic sheet composition comprises the sulfonium borate complex 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 method for preparing a magnetic sheet according to  claim 1 , wherein the magnetic sheet composition further comprises a flame retardant, and the flame retardant contains carboxylic acid amide-containing melamine cyanurate. 
     
     
         6 . Use of a magnetic sheet composition for a magnetic sheet:
 wherein the magnetic sheet composition comprises a binder, magnetic powder and a curing agent and   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 . Use according to  claim 6 , wherein R 1  is a benzyl group, an o-methyl benzyl group, or a (1-naphthyl)methyl group. 
     
     
         8 . Use according to  claim 6 , wherein R 2  is a methyl group. 
     
     
         9 . Use according to  claim 6 , wherein the magnetic sheet composition comprises the sulfonium borate complex in an amount of 2 parts by mass to 15 parts by mass relative to 106.1 parts by mass of the binder. 
     
     
         10 . Use according to  claim 6 , wherein the magnetic sheet composition further comprises a flame retardant, and the flame retardant contains carboxylic acid amide-containing melamine cyanurate.