Composite dielectric material, composite dielectric substrate, prepreg, coated metal foil, molded sheet, composite magnetic substrate, substrate, double side metal foil-clad substrate, flame retardant substrate, polyvinylbenzyl ether resin composition, thermosetting polyvinylbenzyl ether resin composition, and method for preparing thermosetting polyvinylbenzyl ether resin composition

Abstract

A composite dielectric material comprising a resin resulting from a polyvinylbenzyl ether compound and a dielectric ceramic powder dispersed therein is useful in the high-frequency region. A composite magnetic material comprising a polyvinylbenzyl ether compound and a magnetic powder is also provided as well as a flame retardant material comprising a polyvinylbenzyl ether compound and a flame retardant. These materials may be used in the fabrication of substrates, prepreg sheets, coated metal foils, molded items, and metal foil-clad substrates.

1 - 86 . (canceled)  
   
   
       87 . A prepreg, prepared by dispersing a polyvinylbenzyl ether compound and a dielectric ceramic powder in a solvent to form a slurry, applying the slurry to a cloth base, and drying, and wherein 
 the content of the dielectric ceramic powder is from 10 to 65 vol %, based on the dielectric ceramic powder and the polyvinylbenzyl ether compound combined.    
   
   
       88 . The prepreg of  claim 87 , wherein the cloth base is glass cloth.  
   
   
       89 . The prepreg of  claim 87 , wherein the polyvinylbenzyl ether compound has the following formula (1):  
     
       
         
         
             
             
         
       
     
     wherein R 1  denotes methyl or ethyl, R 2  denotes hydrogen or a hydrocarbon group of 1 to 10 carbon atoms, R 3  denotes hydrogen or a vinylbenzyl group in a molar ratio of hydrogen to vinylbenzyl from 60:40 to 0:100, and n is a number of 2 to 4.  
   
   
       90 . The prepreg of  claim 87 , wherein the dielectric ceramic powder has a mean particle size of 0.5 to 100 μm.  
   
   
       91 . A composite dielectric substrate, prepared by heating and compressing the prepreg of  claim 87 , and wherein the substrate is used in a high-frequency region of at least 100 MHz.  
   
   
       92 . A prepreg, prepared by dispersing a polyvinylbenzyl ether compound and a magnetic powder in a solvent to form a slurry, applying the slurry to a glass cloth, and drying.  
   
   
       93 . A prepreg, prepared by dispersing a polyvinylbenzyl ether compound and a flame retardant in a solvent to form a slurry, applying the slurry to a glass cloth, and drying.