Polycarbonate resin composition for thin optical component, and method for producing thin optical component

Abstract

An object of the present invention is to provide a polycarbonate resin composition for a thin optical component, which polycarbonate resin composition has favorable fluidity as well as excellent strength. This object is achieved by a polycarbonate resin composition for a thin optical component, which composition contains: 100 parts by mass of an aromatic polycarbonate resin (A) having a viscosity average molecular weight (Mv) of 10,000 to 15,000; and 2 to 100 parts by mass of an aromatic polycarbonate copolymer (B) including a carbonate structural unit (i) represented by a particular Formula (1) and a carbonate structural unit (ii) represented by a particular Formula (2), wherein the ratio of the carbonate structural unit (i) to a total of 100 mol % of the carbonate structural unit (i) and the carbonate structural unit (ii) in the aromatic polycarbonate copolymer (B) is more than 10 mol % and less than 39 mol %.

1 . A polycarbonate resin composition for a thin optical component, said composition comprising:
 100 parts by mass of an aromatic polycarbonate resin (A) having a viscosity average molecular weight (Mv) of 10,000 to 15,000; and   2 to 100 parts by mass of an aromatic polycarbonate copolymer (B) including a carbonate structural unit (i) represented by the following Formula (1):   
       
         
           
           
               
               
           
         
       
       (wherein in Formula (1), R 1  represents C 3 -C 24  alkyl or alkenyl; R 2  and R 3  each independently represent a C 1 -C 15  monovalent hydrocarbon group; and a and b each independently represent an integer of 0 to 4) and a carbonate structural unit (ii) represented by the following Formula (2): 
       
         
           
           
               
               
           
         
       
       wherein the ratio of the carbonate structural unit (i) to a total of 100 mol % of the carbonate structural unit (i) and the carbonate structural unit (ii) in the aromatic polycarbonate copolymer (B) is more than 10 mol % and less than 39 mol %. 
     
     
         2 . The polycarbonate resin composition for a thin optical component according to  claim 1 , further comprising 0.01 to 1 part by mass of polyalkylene glycol or a fatty acid ester thereof (C) with respect to a total of 100 parts by mass of the aromatic polycarbonate resin (A) and the aromatic polycarbonate copolymer (B). 
     
     
         3 . The polycarbonate resin composition for a thin optical component according to  claim 1 , further comprising 0.005 to 0.5 part by mass of a heat stabilizer (D) with respect to a total of 100 parts by mass of the aromatic polycarbonate resin (A) and the aromatic polycarbonate copolymer (B). 
     
     
         4 . The polycarbonate resin composition for a thin optical component according to  claim 3 , wherein the heat stabilizer (D) is a phosphorus-based antioxidant. 
     
     
         5 . A method for producing a thin optical component, said method comprising the step of molding the polycarbonate resin composition according to  claim 1 . 
     
     
         6 . The method for producing a thin optical component according to  claim 5 , wherein the thin optical component is a light guide plate having a thickness of not more than 1 mm. 
     
     
         7 . A method for producing a thin optical component having a thickness of not more than 1 mm, said method comprising the step of performing injection molding of the polycarbonate resin composition according to  claim 1  at 260 to 380° C.