Modified weatherable polyester molding composition

Abstract

A flame retarded resin molding composition with weatherable properties comprises a polyester and polycarbonate blend modified with an organopolysiloxane polycarbonate and an acrylic impact modifier for enhancing weatherablity.

1 . A modified flame retarded resin molding composition with enhanced weatherable properties comprising a polyester and polycarbonate blend with an organopolysiloxane-polycarbonate and a acrylic impact modifier for enhancing weatherablity and a flame retarding amount of a halogenated flame retardant.  
     
     
         2 . A flame retarded resin molding composition according to  claim 1  wherein the acrylic rubber has a particle size of from 300 to 800 nm.  
     
     
         3 . A flame retarded resin molding composition according to  claim 1  wherein said acrylic core shell rubber comprises a multi-phase composite interpolymer comprising about 25 to 95 weight percent of a first acrylic elastomeric phase polymerized from a monomer system comprising about 75 to 99.8% by weight C 1  to C 14  alkyl acrylate, 0.1 to 5% by weight cross linking member, 0.1 to 5% by weight graft linking monomer, said cross linking monomer being a polyethylenically unsaturated monomer having a plurality of addition polymerizable reactive groups and about 75 to 5 weight percent of a final, rigid thermoplastic acrylic or methacrylic phase polymerized in the presence of said elastomer.  
     
     
         4 . A flame retarded resin molding composition according to  claim 1  wherein said acrylic core shell rubber comprises a multi-phase composite interpolymer comprising about 25 to 95 weight percent of a first acrylic elastomeric phase polymerized from a monomer system comprising about 75 to 99.8%, by weight C 1  to C 14  alkyl acrylate, 0.1 to 5% by weight cross linking member, 0.1 to 5%, by weight graft linking monomer, said cross linking monomer being a polyethylenically unsaturated monomer having a plurality of addition polymerizable reactive groups and about 75 to 5 weight percent of a final, rigid thermoplastic acrylic or methacrylic phase polymerized in the presence of said elastomer.  
     
     
         5 . A flame retarded resin molding composition according to  claim 1  wherein said acrylic core shell rubber comprises a multi-phase composite interpolymer comprising about 25 to 95 weight percent of a first elastomeric phase polymerized from a monomer system comprising about 5-50% polydimethylsiloxane, 30 to 99.8% by weight C 1  to C 14  alkyl acrylate, 0.1 to 5% by weight cross linking member, 0.1 to 5% by weight graft linking monomer, said cross linking monomer being a polyethylenically unsaturated monomer having a plurality of addition polymerizable reactive groups and about 75 to 5 weight percent of a final, rigid thermoplastic acrylic or methacrylic phase polymerized in the presence of said elastomer.  
     
     
         6 . A flame retarded resin molding composition according to  claim 1  wherein said organopolysiloxane-polycarbonate copolymer comprises organopolysiloxane blocks having repeating units of the general formula:  
       
         
           
           
               
               
           
         
       
     
     
         7 . wherein R′ is a member selected from the class of monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals and cyanoalkyl radicals; E is independently selected from the group consisting of hydrogen, lower alkyl, alkoxy radicals, aryl, and alkylaryl, halogen radicals and mixtures thereof, and R″ is a divalent hydrocarbon radical, and n is from about 10 to about 120.  
     
     
         8 . A flame retarded resin molding composition according to  claim 2  wherein said organopolysiloxane-polycarbonate copolymer comprises polycarbonate blocks having repeating units of the general formulae:  
       
         
           
           
               
               
           
         
       
       and D is a divalent hydrocarbon radical containing from 1-15 carbon atoms; —S—, —SO—, —S(O) 2 ; —O—.  
     
     
         9 . A flame retarded resin molding composition according to  claim 3  wherein said organopolysiloxane-polycarbonate copolymer comprises polycarbonate blocks having repeating units of the general formulae:  
       
         
           
           
               
               
           
         
       
       wherein R is a member selected from the class of hydrogen, cycloaliphatic, aryl, monovalent hydrocarbon radicals, aryl or alkyaryl.  
     
     
         10 . A flame retarded resin molding composition according to  claim 1  wherein said organopolysiloxane-polycarbonate copolymer comprises organopolysiloxane blocks having repeating units of the general formulae:  
       
         
           
           
               
               
           
         
       
     
     
         11 . A flame retarded resin molding compositions according to  claim 5  wherein E is independently selected from the group consisting of hydrogen, alkyl of 1 to 6 carbon atoms, and halogen.  
     
     
         12 . A flame retarded resin molding compositions according to  claim 1  wherein said acrylic impact modifier comprises first repeating units derived one or more glycidyl ester monomers and second repeating units derived from one or more x-olefin monomers.  
     
     
         13 . A flame retarded resin molding compositions according to  claim 1  wherein said polyester is derived from an aliphatic diol and an aromatic dicarboxylic acid having repeating units of the following general formula:  
       
         
           
           
               
               
           
         
       
       wherein each A is independently a divalent aliphatic, salicylic or aromatic hydrocarbon or polyoxyalkylene radical, or mixtures thereof and each B is independently a divalent aliphatic, salicylic or aromatic radical, or mixtures thereof.  
     
     
         14 . A flame retarded resin molding compositions according to  claim 1  wherein comprises an aromatic polycarbonate resin comprises one or more resins selected from linear aromatic polycarbonate resins, branched aromatic polycarbonate resins and poly(ester-carbonate) resins.  
     
     
         15 . A flame retarded resin molding compositions according to  claim 1  wherein said polycarbonate comprises a linear aromatic polycarbonate resin.  
     
     
         16 . flame retarded resin molding compositions according to  claim 1  wherein said polycarbonate comprises a poly(ester carbonate).  
     
     
         17 . A flame retarded resin molding compositions according to  claim 1  wherein the resin comprises from 20 to 80 parts by weight of the polycarbonate resin; from 20 to 80 parts by weight of the polyester resin; from 5 to 30 parts by weight of the organopolysiloxane-polycarbonate block copolymer; and from 1 to 10 parts by weight of the glycidyl ester impact modifier, each based on 100 parts by weight of the blend.  
     
     
         18 . A flame retarded resin molding compositions according to  claim 1  wherein the resin comprises from 25 to 55 parts by weight, of the polycarbonate resin; 
 from 25 to 55 parts by weight of the polyester resin; from 10 to 20 parts by weight of the organopolysiloxane-polycarbonate block copolymer; and from 2 to 8 parts by weight of the acrylic impact modifier, each based on 100 parts by weight of the blend.    
     
     
         19 . A flame retarded resin molding composition according to  claim 1  wherein said flame retardant is a halogenated epoxy, poly(haloarylmethacrylate), halogenated polystyrene or a poly(haloarylacrylate) flame retardant.  
     
     
         20 . A flame retarded resin molding composition according to  claim 1  wherein said flame retardant is a polybromobenzylacrylate flame retardant  
     
     
         21 . An article molded from the composition of  claim 1 .  
     
     
         22 . A molded article according to  claim 18  comprising an injection molded article.  
     
     
         23 . A molded article according to  claim 18  comprising an enclosures.  
     
     
         24 . A molded article according to  claim 20  for use in an electrical communication device.  
     
     
         25 . A molded article according to  claim 21  comprising a cable connector, telephone, computer, video, and network interface devices for residential, commercial or industrial use.