Abstract: The present invention provides a substantially amorphous polyester resin composition, which comprises: 1 to 40 parts by weight of a core-shell modifier for impact resistance, which comprises, as a core, a bilayer aromatic vinyl-butadiene based copolymer comprising an innermost layer having a higher content in weight of a cross-linking monomer, and has a refractive index between 1.55 and 1.60; and 60 to 99 parts by weight of at least one aromatic polyester or co-polyester, wherein the amorphous polyester resin composition exhibits high transparency, high impact resistance, and is improved in whitening properties at a low stress.

Abstract: Obtention of the amorphous polyester resin compositions having improved impact resistance, by using the core-shell impact resistance improving agents which comprises: (A) from 40 to 90 parts by weight of a core made of a butadiene-based copolymer; (B) from 5 to 40 parts by weight of an inner layer shell obtained by polymerizing a monomer mixture containing a (meth) acrylate monomer having hydroxyl or alkoxy group; and (C) from 5 to 20 parts by weight of an outer layer shell obtained by polymerizing a monomer mixture containing an aromatic vinyl monomer.

Abstract: Obtention of the amorphous polyester resin compositions having improved impact resistance, by using the core-shell impact resistance improving agents which comprises: (A) from 40 to 90 parts by weight of a core made of a butadiene-based copolymer; (B) from 5 to 40 parts by weight of an inner layer shell obtained by polymerizing a monomer mixture containing a (meth) acrylate monomer having hydroxyl or alkoxy group; and (C) from 5 to 20 parts by weight of an outer layer shell obtained by polymerizing a monomer mixture containing an aromatic vinyl monomer.