Polyester resin composition for profile extrusion molding and molded article comprising the same

Abstract

A polyester resin composition for profile extrusion molding comprising an amorphous polyester, at least one component selected from the group consisting of a crystalline polyester and a nucleating agent, and optionally a reactive compound; a polyester resin composition for profile extrusion molding comprising a polyester resin, and a reactive compound having a weight average molecular weight of 200 to 500,000; and a profile shape comprising a resin having a reduced viscosity ratio of 1.01 to 3.00, a reduced viscosity ratio being a ratio of a reduced viscosity of a resin after molding to that of a resin before molding. They do not suffer from sagging in the molding process, they improve the shape accuracy at corners and edges of profile shapes from a die to a sizing step and also resistance to whitening on bending in transparent products, and can provide profile shapes having good solvent resistance and detergent resistance.

1 . A polyester resin composition for profile extrusion molding comprising 
 (A) an amorphous polyester, and    (B) at least one component selected from the group consisting of (B1) a crystalline polyester and (B2) a nucleating agent; and    (C) a reactive compound.    
   
   
       2 . The polyester resin composition for profile extrusion molding according to  claim 1  wherein said amorphous polyester (A) comprises an acid component containing at least 50% by mole of an aromatic dicarboxylic acid having 8 to 14 carbon atoms, and an alcohol component containing at least 50% by mole of an aliphatic or cycloaliphatic glycol having 2 to 10 carbon atoms.  
   
   
       3 . The polyester resin composition for profile extrusion molding according to  claim 2  wherein said aromatic dicarboxylic acid having 8 to 14 carbon atoms is at least one carboxylic acid selected from the group consisting of terephthalic acid and isophthalic acid.  
   
   
       4 . The polyester resin composition for profile extrusion molding according to  claim 2  wherein said aliphatic or cycloaliphatic glycol having 2 to 10 carbon atoms is at least one glycol selected from the group consisting of ethylene glycol, diethylene glycol, neopentyl glycol, cyclohexanedimethanol, 1,3-propanediol and 2-methyl-1,3-propanediol.  
   
   
       5 . The polyester resin composition for profile extrusion molding according to  claim 1  wherein said reactive compound (C) has at least two functional groups selected from the group consisting of a glycidyl group and an isocyanate group, per molecule.  
   
   
       6 . The polyester resin composition for profile extrusion molding according to  claim 1  wherein an amount of said reactive compound (C) is from 0.1 to 20% by weight per 100 parts by weight of said amorphous polyester (A).  
   
   
       7 . The polyester resin composition for profile extrusion molding according to  claim 1  wherein said reactive compound (C) has a weight average molecular weight of 200 to 500,000.  
   
   
       8 . The polyester resin composition for profile extrusion molding according to  claim 1  wherein said crystalline polyester (B1) has a melting point of 90 to 220° C.  
   
   
       9 . The polyester resin composition for profile extrusion molding according to  claim 8  wherein said crystalline polyester (B1) comprises at least 50% by mole of at least one glycol selected from the group consisting of ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol and cyclohexanedimethanol, based on the whole alcohol component (100% by mole).  
   
   
       10 . A profile shape obtained by profile extrusion molding a polyester resin composition according to  claim 1 .  
   
   
       11 . A profile shape obtained by profile extrusion molding a polyester resin composition according to  claim 1.