(19)

(11)

EP 1 866 253 A1

(12)

(43) Date of publication: 19.12.2007 Bulletin 2007/51 (21) Application number: 06725863.2 (22) Date of filing: 30.03.2006

(51) International Patent Classification (IPC):  C02F 1/461(2006.01) (86) International application number: PCT/FI2006/000102 (87) International publication number: WO 2006/103314 (05.10.2006 Gazette 2006/40)

(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: 30.03.2005 FI 20050335 (71) Applicant: Oy Keskuslaboratorio - Centrallaboratorium Ab 02151 Espoo (FI)	(72) Inventor: SAVOLAINEN, Martti FI-02760 Espoo (FI) (74) Representative: Knuth-Lehtola, Sisko Hillevi  Seppo Laine Oy, Itämerenkatu 3 B 00180 Helsinki 00180 Helsinki (FI)