the purposes of the present invention are to provide highly impact - resistant thermoplastic polyester resin inexpensively and promote the recycling of pet bottles , which are dumped as waste . to attain the purposes , a carboxyl - modified metallocene catalyzed polyolefin elastomer or a glycidyl methacrylate adduct to the elastomer is melt - blended with a thermoplastic polyester resin , particularly , the powder of recycled pet bottles . additionally , a filler can be mixed , if necessary .