(19)

(11)

EP 2 643 517 A2

(12)

(88) Date of publication A3: 16.08.2012 (43) Date of publication: 02.10.2013 Bulletin 2013/40 (21) Application number: 11791397.0 (22) Date of filing: 21.11.2011

(51) International Patent Classification (IPC):  D21C 3/26(2006.01) (86) International application number: PCT/US2011/061617 (87) International publication number: WO 2012/071312 (31.05.2012 Gazette 2012/22)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 23.11.2010 US 416484 P (71) Applicant: E.I. Du Pont De Nemours and Company Wilmington, Delaware 19898 (US)	(72) Inventor: COHEN, Jeffrey, David Kennett Square, Pennsylvania 19348 (US) (74) Representative: Matthews, Derek Peter  Dehns St Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)