Copier/printer exterior part using halogen-free flame-retardant resin composition including recycled polycarbonate and recycled polyethylene terephthalate

Abstract

A copier/printer exterior part uses a halogen-free flame-retardant resin composition. The halogen-free flame-retardant resin composition includes 5 wt % to 50 wt % of unused polycarbonate, 20 wt % to 63 wt % of recycled polycarbonate, 5 wt % to 35 wt % of recycled polyethylene terephthalate, 0.2 wt % to 2 wt % of a styrene-acrylonitrile-glycidyl methacrylate terpolymer, 5 wt % to 15 wt % of a toughener, 10 wt % to 20 wt % of a flame retardant, 0.1 wt % to 0.8 wt % of a flame-retardant antidrip agent, 0.1 wt % to 1 wt % of an antioxidant, and 0.1 wt % to 2 wt % of a lubricant. The styrene-acrylonitrile-glycidyl methacrylate terpolymer includes 1 wt % to 5 wt % of glycidyl methacrylate and 20 wt % to 33 wt % of acrylonitrile.

What is claimed is: 
     
         1 . A copier/printer exterior part using a halogen-free flame-retardant resin composition comprising:
 5 wt % to 50 wt % of unused polycarbonate;   20 wt % to 63 wt % of recycled polycarbonate;   5 wt % to 35 wt % of recycled polyethylene terephthalate;   0.2 wt % to 2 wt % of a styrene-acrylonitrile-glycidyl methacrylate terpolymer;   5 wt % to 15 wt % of a toughener;   10 wt % to 20 wt % of a flame retardant;   0.1 wt % to 0.8 wt % of a flame-retardant antidrip agent;   0.1 wt % to 1 wt % of an antioxidant; and   0.1 wt % to 2 wt % of a lubricant, wherein   the styrene-acrylonitrile-glycidyl methacrylate terpolymer includes 1 wt % to 5 wt % of glycidyl methacrylate and 20 wt % to 33 wt % of acrylonitrile.   
     
     
         2 . The copier/printer exterior part according to  claim 1 , wherein the styrene-acrylonitrile-glycidyl methacrylate terpolymer includes 1 wt % to 5 wt % of glycidyl methacrylate and 27 wt % to 30 wt % of acrylonitrile. 
     
     
         3 . The copier/printer exterior part according to  claim 1 , wherein the unused polycarbonate is bisphenol A type aromatic polycarbonate having a weight average molecular weight of 10000 to 40000. 
     
     
         4 . The copier/printer exterior part according to  claim 1 , wherein the recycled polycarbonate is bisphenol A type aromatic polycarbonate having a weight average molecular weight of 10000 to 40000. 
     
     
         5 . The copier/printer exterior part according to  claim 1 , wherein the recycled polyethylene terephthalate has a viscosity of 0.65 dl/g to 0.9 dl/g. 
     
     
         6 . The copier/printer exterior part according to  claim 1 , wherein the toughener is at least one of a core-shell structured acrylate system toughener, a core-shell structured acrylate-silicone rubber system toughener, a core-shell structured styrene system toughener, a long-chain type toughener, and a reaction type terpolymer toughener. 
     
     
         7 . The copier/printer exterior part according to  claim 6 , wherein the toughener is at least one of a core-shell structured acrylate system toughener and a core-shell structured acrylate-silicone rubber system toughener. 
     
     
         8 . The copier/printer exterior part according to  claim 6 , wherein
 the core-shell structured acrylate system toughener is a methyl methacrylate-butadiene-styrene copolymer, an acrylonitrile-butadiene-acrylate copolymer, or a methyl methacrylate-butyl methacrylate copolymer,   the core-shell structured acrylate-silicone rubber system toughener is a methyl methacrylate-silicone rubber copolymer,   the core-shell structured styrene system toughener is an acrylonitrile-styrene-butadiene terpolymer,   the long-chain type toughener is an ethylene-methyl acrylate copolymer or an ethylene-butyl acrylate copolymer, and   the reaction type terpolymer toughener is an ethylene-methyl acrylate-glycidyl methacrylate copolymer or an ethylene-butyl acrylate-glycidyl methacrylate copolymer.   
     
     
         9 . The copier/printer exterior part according to  claim 1 , wherein the flame retardant is a phosphate type flame retardant. 
     
     
         10 . The copier/printer exterior part according to  claim 9 , wherein the phosphate type flame retardant is at least one of a monophosphate type flame retardant and an oligophosphate type flame retardant. 
     
     
         11 . The copier/printer exterior part according to  claim 10 , wherein
 the monophosphate type flame retardant is trimethyl phosphate, triethyl phosphate, triphenyl phosphate, dimethylphenyl phosphate, tributyl phosphate, or xylyl diphenyl phosphate, and   the oligophosphate type flame retardant is resorcinol bis(diphenyl phosphate), bisphenol A bis (diphenyl phosphate), or diphenyl pentaerythritol diphosphate.   
     
     
         12 . The copier/printer exterior part according to  claim 1 , wherein the antioxidant is at least one of a hindered phenol system antioxidant and a phosphite system antioxidant. 
     
     
         13 . The copier/printer exterior part according to  claim 12 , wherein
 the hindered phenol system antioxidant is triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate], pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], or n-octadecyl-β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and   the phosphite system antioxidant is tris(2,4-di-tert-butylphenyl)phosphite or bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite.   
     
     
         14 . The copier/printer exterior part according to  claim 1 , wherein the lubricant is at least one of fatty acid salt, fatty acid amide, a silane polymer, solid paraffin, liquid paraffin, calcium stearate, zinc stearate, octadecanamide, silicone powder, methylene bis(octadecanamide), and N,N′-ethylene bis(octadecanamide). 
     
     
         15 . The copier/printer exterior part according to  claim 1 , wherein the flame-retardant antidrip agent is a polytetrafluoroethylene system flame-retardant antidrip agent. 
     
     
         16 . The copier/printer exterior part according to  claim 1 , wherein the halogen-free flame-retardant resin composition is obtained by:
 obtaining materials of the halogen-free flame-retardant resin composition;   of the materials, sufficiently mixing a recycled polyethylene terephthalate material and a styrene-acrylonitrile-glycidyl methacrylate terpolymer material in a mixer so as to make a first mixture, taking out the first mixture from the mixer, and placing the first mixture in a screw extruder to extrude the first mixture so as to produce a base grain; and   sufficiently mixing the base grain and the remaining materials in the mixer so as to make a second mixture, taking out the second mixture from the mixer, and placing the second mixture in the screw extruder to extrude the second mixture so as to produce a final grain as the halogen-free flame-retardant resin composition.