Heat-dissipating member and method for producing same

Abstract

The present invention provides a heat dissipating member containing a fluorine resin and a thermally-conductive filler and having good adhesive properties. The present invention is a heat dissipating member including: a porous base material containing a fluorine resin and a thermally-conductive filler; and an adhesive material contained in pores of the porous base material. The fluorine resin contains polytetrafluoroethylene.

1 . A heat dissipating member comprising:
 a porous base material containing a fluorine resin and a thermally-conductive filler; and   an adhesive material contained in pores of the porous base material, wherein   the fluorine resin contains polytetrafluoroethylene.   
     
     
         2 . The heat dissipating member according to  claim 1 , wherein the fluorine resin further contains at least one selected from the group consisting of perfluoroalkoxy resins and tetrafluoroethylene-hexafluoropropylene copolymers. 
     
     
         3 . The heat dissipating member according to  claim 1 , containing the adhesive material in an amount of 1% by mass or more. 
     
     
         4 . The heat dissipating member according to  claim 1 , wherein the thermally-conductive filler is at least one insulating filler selected from the group consisting of boron nitride, aluminum nitride, alumina, silicon nitride, and magnesium oxide. 
     
     
         5 . The heat dissipating member according to  claim 1 , wherein the thermally-conductive filler is at least one electrically-conductive filler selected from the group consisting of graphite, carbon black, carbon fibers, metal fibers, and metal particles. 
     
     
         6 . A method for producing a heat dissipating member, comprising the steps of
 (1) stacking and rolling together a plurality of sheet-shaped formed bodies each containing a polytetrafluoroethylene-containing fluorine resin, a thermally-conductive filler, and a molding aid, so as to obtain a rolled laminated sheet;   (2) removing the molding aid from the obtained rolled laminated sheet to obtain a porous base material; and   (3) impregnating the obtained porous base material with an adhesive material.   
     
     
         7 . The method for producing a heat dissipating member according to  claim 6 , further comprising a step (4) of subjecting the porous base material to pressure molding between the step (2) and the step (3). 
     
     
         8 . The method for producing a heat dissipating member according to  claim 6 , wherein the step (3) is performed by immersing the porous base material in the adhesive material and then by pressurizing the adhesive material.