(19)

(11)

EP 1 853 765 A1

(12)

(43) Date of publication: 14.11.2007 Bulletin 2007/46 (21) Application number: 06723263.7 (22) Date of filing: 01.03.2006

(51) International Patent Classification (IPC):  E01C 13/08(2006.01) (86) International application number: PCT/EP2006/002065 (87) International publication number: WO 2006/092337 (08.09.2006 Gazette 2006/36)

(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 NL PL PT RO SE SI SK TR (30) Priority: 01.03.2005 EP 05075495 (71) Applicant: DSM IP Assets B.V. 6411 TE Heerlen (NL)	(72) Inventors: DOZEMAN, Albertus Otto 6121 NK Born (NL) SMIT, Mario Martinus Johanna 6133 VK Sittard (NL) WIJERS, Bart Gerardus Christiaan Johannes 6181 MJ Elsloo (NL) (74) Representative: Heijman, Renske Harriët et al DSM Intellectual Property P.O. Box 9 6160 MA Geleen 6160 MA Geleen (NL)