(19)
(11) EP 2 519 692 A1

(12)

(43) Date of publication:
07.11.2012 Bulletin 2012/45

(21) Application number: 10799243.0

(22) Date of filing: 22.12.2010
(51) International Patent Classification (IPC): 
D21H 21/18(2006.01)
(86) International application number:
PCT/US2010/061750
(87) International publication number:
WO 2011/090672 (28.07.2011 Gazette 2011/30)
(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: 29.12.2009 US 290670 P

(71) Applicant: Hercules Incorporated
Wilmington, DE 19808 (US)

(72) Inventors:
  • BRUNGARDT, Clement, L.
    Oxford, PA 19363 (US)
  • MCKAY, Jonathan, M.
    Wilmington, DE 19808 (US)
  • RIEHLE, Richard, J.
    Wilmington, DE 19807 (US)

(74) Representative: HOFFMANN EITLE 
Patent- und Rechtsanwälte Arabellastrasse 4
81925 München
81925 München (DE)

   


(54) PROCESS TO ENHANCING DRY STRENGTH OF PAPER BY TREATMENT WITH VINYLAMINE-CONTAINING POLYMERS AND ACRYLAMIDE CONTAINING POLYMERS