Method for treating flame retardant resin composition

Abstract

For efficiently recycling a flame retardant resin composition constituted of a flame retardant and a resin, the present invention provides a method for treating a flame retardant resin composition comprising a step of bringing at least part of a flame retardant resin composition containing a resin and a flame retardant into contact with a pressurized fluid constituted of a solvent to reduce the flame retardancy.

We claim:  
     
         1 . A method for treating a flame retardant resin composition, comprising a step of bringing at least part of a flame retardant resin composition containing a resin and a flame retardant into contact with a pressurized fluid constituted of a solvent to reduce flame retardancy of said flame retardant resin composition.  
     
     
         2 . The method for treating a flame retardant resin composition in accordance with  claim 1 , wherein said flame retardancy is reduced through extraction of said flame retardant by bringing at least part of said flame retardant resin composition into contact with said pressurized fluid.  
     
     
         3 . The method for treating a flame retardant resin composition in accordance with  claim 2 , further comprising a step of foaming said flame retardant resin composition after the extraction of said flame retardant by the use of said solvent constituting said pressurized fluid  
     
     
         4 . The method for treating a flame retardant resin composition in accordance with  claim 2 , wherein said solvent is carbon dioxide.  
     
     
         5 . The method for treating a flame retardant resin composition in accordance with  claim 2 , wherein said pressurized fluid contains an auxiliary solvent.  
     
     
         6 . The method for treating a flame retardant resin composition in accordance with  claim 2 , wherein said pressurized fluid has a pressure of not lower than the critical pressure of said solvent constituting said pressurized fluid and not higher than three times said critical pressure.  
     
     
         7 . The method for treating a flame retardant resin composition in accordance with  claim 2 , wherein said pressurized fluid has a pressure of not lower than half the critical pressure of said solvent constituting said pressurized fluid and lower than said critical pressure.  
     
     
         8 . The method for treating a flame retardant resin composition in accordance with  claim 1 , wherein said flame retardant is a halogen-containing flame retardant and said flame retardancy is reduced through dehalogenation by bringing at least part of said flame retardant resin composition into contact with said pressurized fluid.  
     
     
         9 . The method for treating a flame retardant resin composition in accordance with  claim 8 , further comprising a step of reducing said flame retardant resin composition after said dehalogenation with said solvent constituting said pressurized fluid.  
     
     
         10 . The method for treating a flame retardant resin composition in accordance with  claim 9 , further comprising a step of foaming said flame retardant resin composition after said dehalogenation with said solvent constituting said pressurized fluid.  
     
     
         11 . The method for treating a flame retardant resin composition in accordance with  claim 8 , wherein said solvent is carbon dioxide.  
     
     
         12 . The method for treating a flame retardant resin composition in accordance with  claim 8 , wherein said pressurized fluid has a pressure of not lower than the critical pressure of said solvent constituting said pressurized fluid and not higher than three times said critical pressure.  
     
     
         13 . The method for treating a flame retardant resin composition in accordance with  claim 8 , wherein said pressurized fluid has a pressure of not lower than half the critical pressure of said solvent constituting said pressurized fluid and less than said critical pressure.