(19)

(11)

EP 2 040 861 A1

(12)

(43) Date of publication: 01.04.2009 Bulletin 2009/14 (21) Application number: 07790726.9 (22) Date of filing: 06.07.2007

(51) International Patent Classification (IPC):  B21C 25/02(2006.01) B21C 23/00(2006.01) (86) International application number: PCT/JP2007/063945 (87) International publication number: WO 2008/004714 (10.01.2008 Gazette 2008/02)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (30) Priority: 07.07.2006 JP 2006187944 29.01.2007 US 887054 P 07.03.2007 JP 2007056656 (71) Applicant: Showa Denko K.K. Tokyo 105-8518 (JP)	(72) Inventors: HIRAMOTO, Kimihisa Oyama-shi Tochigi 323-8678 (JP) SAKIHAMA, Hidekazu Oyama-shi Tochigi 323-8678 (JP) (74) Representative: Viering, Jentschura & Partner  Grillparzerstrasse 14 81675 München 81675 München (DE)