(19)
(11) EP 2 137 219 A1

(12)

(43) Date of publication:
30.12.2009 Bulletin 2009/53

(21) Application number: 08743049.2

(22) Date of filing: 18.04.2008
(51) International Patent Classification (IPC): 
C08B 37/00(2006.01)
(86) International application number:
PCT/US2008/005013
(87) International publication number:
WO 2008/133847 (06.11.2008 Gazette 2008/45)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

(30) Priority: 24.04.2007 US 925948 P

(71) Applicant: E. I. Du Pont de Nemours and Company
Wilmington, DE 19898 (US)

(72) Inventors:
  • COHEN, Jeffrey, David
    Kennett Square, Pennsylvania 19348 (US)
  • CHENAULT, Henry, Keith
    Hockessin, Delaware 19707 (US)
  • SCHIFFINO, Rinaldo, S.
    Wilmington, Delaware 19807 (US)

(74) Representative: Hirsch, Marc-Roger 
Cabinet Hirsch & Associates Law Office 58, avenue Marceau
75008 Paris
75008 Paris (FR)

   


(54) METHOD FOR MAKING A POLYSACCHARIDE DIALDEHYDE HAVING HIGH PURITY