Polycarbonate resin composition

Abstract

A polycarbonate resin composition comprising, 100 mass parts of (A1) a polycarbonate resin that contains a polycarbonate resin having a structural unit of the following general formula (1) and (A2) a polycarbonate resin having a structural unit of the general formula (2) in a mass ratio (A1)/(A2) of 100/0 to 10/90; 3 to 20 mass parts of a phosphorus flame retardant (B); 2 to 20 mass parts of a silicone flame retardant (C); and 3 to 100 mass parts of an inorganic filler (D), wherein the phosphorus flame retardant (B) is a phosphazene compound and/or a condensed phosphate ester,[C1]

1 . A polycarbonate resin composition comprising:
 100 mass parts of a polycarbonate resin comprising a polycarbonate resin (A1) having a structural unit of formula (1) and a polycarbonate resin (A2) having a structural unit of formula (2) in a mass ratio (A1)/(A2) of 100/0 to 10/90;   3 to 20 mass parts of a phosphorus flame retardant (B), which is a phosphazene compound and/or a condensed phosphate ester of formula (3);   2 to 20 mass parts of a silicone flame retardant (C), which is a polyorganosiloxane-containing graft copolymer; and   3 to 100 mass parts of talc (D),   
       
         
           
           
               
               
           
         
         wherein in the formula (1), R 1  is a methyl group, R 2  is a hydrogen atom, and X is an isopropylidene group, 
       
       
         
           
           
               
               
           
         
         wherein in the formula (2), X is an isopropylidene group, 
       
       
         
           
           
               
               
           
         
         wherein in the formula (3), R 1 , R 2 , R 3 , and R 4  each represent an alkyl group having 1 to 6 carbons or an aryl group having 6 to 20 carbons which are optionally substituted by an alkyl group; p, q, r, and s are each 0 or 1; k is an integer from 1 to 5; and X 1  represents an arylene group, 
         wherein a ratio [(B)+(C)]/(D) between a total content of the phosphorus flame retardant (B) and the silicone flame retardant (C) and the content of the talc (D) is not more than 1.05. 
       
     
     
         2 - 3 . (canceled) 
     
     
         4 . The polycarbonate resin composition according to  claim 1 , wherein a content of the polycarbonate resin having a branched structure is 10 to 100 mass % in 100 mass % of a total of polycarbonate resins (A1) and (A2). 
     
     
         5 . The polycarbonate resin composition according to  claim 1 , wherein a total content of the phosphorus flame retardant (B) and the silicone flame retardant (C) is 15 to 40 mass parts per 100 mass parts of a total of polycarbonate resins (A1) and (A2). 
     
     
         6 - 8 . (canceled) 
     
     
         9 . The polycarbonate resin composition according to  claim 1 , further comprising:
 0.05 to 3 mass parts of a fluoropolymer (E) per 100 mass parts of a total of the polycarbonate resins (A1) and (A2).   
     
     
         10 . The polycarbonate resin composition according to  claim 1 , further comprising:
 0.05 to 1 mass parts of an organic acid (F) per 100 mass parts of a total of the polycarbonate resins (A1) and (A2).   
     
     
         11 . The polycarbonate resin composition according to  claim 1 , wherein a maximum average rate of heat emission as tested in accordance with ISO 5660-1 using conditions of a heater irradiance of 50 kW/m 2  and the presence of ignition is not more than 120 kW/m 2 . 
     
     
         12 . The polycarbonate resin composition according to  claim 1 , wherein a specific optical density D s (4) at 4 minutes after the beginning of the test as tested in accordance with ISO 5659-2 using conditions of a heater irradiance of 50 kW/m 2  and a flameless procedure is not more than 400. 
     
     
         13 . The polycarbonate resin composition according to  claim 1 , wherein a cumulative value VOF 4  of the specific optical density for 4 minutes after the beginning of the test as tested in accordance with ISO 5659-2 using conditions of a heater irradiance of 50 kW/m 2  and a flameless procedure is not more than 650. 
     
     
         14 . The polycarbonate resin composition according to  claim 1 ,
 wherein a maximum average rate of heat emission as tested in accordance with ISO 5660-1 using conditions of a heater irradiance of 50 kW/m 2  and the presence of ignition is not more than 110 kW/m 2 ,   a D s (4) at 4 minutes after the beginning of the test as tested in accordance with ISO 5659-2 using conditions of a heater irradiance of 50 kW/m 2  and a flameless procedure is not more than 350, and   a cumulative value VOF 4  of the specific optical density for 4 minutes after the beginning of the test as tested in accordance with ISO 5659-2 using conditions of a heater irradiance of 50 kW/m 2  and a flameless procedure is not more than 600.   
     
     
         15 . A railway vehicle interior member comprising the polycarbonate resin composition according to  claim 1 . 
     
     
         16 . The polycarbonate resin composition according to  claim 1 , wherein an amount of the talc (D) is 18 to 100 mass parts per 100 mass parts of a total of polycarbonate resins (A1) and (A2). 
     
     
         17 . The polycarbonate resin composition according to  claim 1 , wherein the ratio of [(B)+(C)]/(D) is 0.3 or more. 
     
     
         18 . The polycarbonate resin composition according to  claim 1 , wherein the ratio of [(B)+(C)]/(D) is 0.6 or more.