(19)
(11) EP 2 058 344 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
28.10.2009 Bulletin 2009/44

(43) Date of publication:
13.05.2009 Bulletin 2009/20

(21) Application number: 07806211.4

(22) Date of filing: 29.08.2007
(51) International Patent Classification (IPC): 
C08F 279/02(2006.01)
C08F 257/02(2006.01)
 C08L 51/04(2006.01)
C08L 55/00(2006.01)
(86) International application number:
PCT/JP2007/066734
(87) International publication number:
WO 2008/026626 (06.03.2008 Gazette 2008/10)
(84) Designated Contracting States:
DE GB

(30) Priority: 29.08.2006 JP 2006231776

(71) Applicants:
  • Mitsubishi Rayon Co. Ltd.
    Minato-ku Tokyo 108-8506 (JP)
  • Cheil Industries Inc.
    Gumi-si, Gyeongsangbuk-do 730-710 (KR)

(72) Inventors:
  • OKUNAKA, Osamu
    Toyohashi-shi Aichi 4408601 (JP)
  • NISHII, Hiroyuki
    Otake-shi Hiroshima 739-0693 (JP)
  • SHOUJI, Takashi
    Otake-shi Hiroshima 739-0693 (JP)
  • NAKAMURA, Keiji
    Otake-shi Hiroshima 7390693 (JP)
  • KIM, Tae Uk
    Suwon-si Gyeonggi-do 440-716 (KR)
  • LEE, Byung Choon
    Anyang-si Gyeonggi-do 431-065 (KR)

(74) Representative: Merkle, Gebhard 
TER MEER STEINMEISTER & PARTNER GbR, Patentanwälte Mauerkircherstrasse 45
81679 München
81679 München (DE)


(56) References cited: : 
   
       


    (54) IMPACT STRENGTH MODIFIER, THERMOPLASTIC RESIN COMPOSITION, MOLDED ARTICLE, AND METHOD FOR PRODUCING GRAFT COPOLYMER


    (57) Disclosed is a thermoplastic resin composition having excellent impact resistance at a low temperature, while maintaining high transparency; this thermoplastic resin composition is obtained by compounding an impact resistance improver into a thermoplastic resin, the impact resistance improver being composed of a graft copolymer which is obtained by polymerizing a vinyl monomer component in the presence of a polymer mixture containing a polymer having butadiene units as an essential component and a polymer having styrene units as an essential component, the polymer mixture containing 45 to 65% by mass of the butadiene units and 35 to 55% by mass of the styrene units.