Polycarbonate resin powder and method for transporting same

Abstract

Provided is a polycarbonate resin powder, including a polycarbonate-polyorganosiloxane copolymer, in which an amount of particles each having a particle diameter of 300 μm or less in an entirety of the powder is 60 mass % or less.

1 . A polycarbonate resin powder, comprising a polycarbonate-polyorganosiloxane copolymer comprising:
 a polycarbonate block (A) having a repeating unit represented by the following general formula (I); and   a polyorganosiloxane block (B) having a repeating unit represented by the following general formula (II),   wherein an amount of particles each having a particle diameter of 300 μm or less in an entirety of the powder is 60 mass % or less:   
       
         
           
           
               
               
           
         
       
       wherein:
 R 1  and R 2  each independently represent a halogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms, X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, a fluorenediyl group, an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, —S—, —SO—, —SO 2 —, —O—, or —CO—, and a and b each independently represent an integer of from 0 to 4; and 
 R 3  and R 4  each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and n represents a total number of siloxane repeating units in the polyorganosiloxane block. 
 
     
     
         2 . The polycarbonate resin powder according to  claim 1 , wherein the polycarbonate resin powder has an angle of repose of 42.5° or less. 
     
     
         3 . The polycarbonate resin powder according to  claim 1 , wherein the polycarbonate-polyorganosiloxane copolymer has a viscosity-average molecular weight (Mv) of from 15,500 to 30,000. 
     
     
         4 . The polycarbonate resin powder according to  claim 1 , wherein the polycarbonate resin powder has a mean area diameter of from 0.10 mm to 1.00 mm. 
     
     
         5 . The polycarbonate resin powder according to  claim 1 , wherein n in the general formula (II) represents from 20 to 500. 
     
     
         6 . The polycarbonate resin powder according to  claim 1 , wherein a content of a polyorganosiloxane block moiety in the polycarbonate resin powder is from 1.0 mass % to 50 mass %. 
     
     
         7 . A method of transporting a polycarbonate resin powder, the method comprising pneumatically transporting the polycarbonate resin powder of  claim 1 . 
     
     
         8 . The method of transporting a polycarbonate resin powder according to  claim 7 , wherein the pneumatically transporting is performed at a gas velocity of from 7 m/s to 30 m/s. 
     
     
         9 . The method of transporting a polycarbonate resin powder according to  claim 7 , wherein the pneumatically transporting is performed using nitrogen as a gas. 
     
     
         10 . The method of transporting a polycarbonate resin powder according to  claim 7 , the method further comprising separating the gas and the powder with a separator, wherein the separator has a filter. 
     
     
         11 . The method of transporting a polycarbonate resin powder according to  claim 10 , wherein the filter comprises a bag filter. 
     
     
         12 . The method of transporting a polycarbonate resin powder according to  claim 11 , wherein the bag filter has a filter cloth having a polyester substrate coated with polytetrafluoroethylene. 
     
     
         13 . The method of transporting a polycarbonate resin powder according to  claim 12 , wherein the filter cloth has a thickness of from 1 mm to 3 mm, a mass per unit area of from 300 g/m 2  to 600 g/m 2 , and an air permeability of from 3 cm/s to 10 cm/s.