(19)
(11) EP 1 763 609 A1

(12)

(43) Date of publication:
21.03.2007 Bulletin 2007/12

(21) Application number: 05774005.2

(22) Date of filing: 24.06.2005
(51) International Patent Classification (IPC): 
D21H 21/02(2006.01)
(86) International application number:
PCT/EP2005/052964
(87) International publication number:
WO 2006/003122 (12.01.2006 Gazette 2006/02)
(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 MC NL PL PT RO SE SI SK TR

(30) Priority: 02.07.2004 US 585184 P
17.03.2005 US 662755 P

(71) Applicant: Ciba Specialty Chemicals Water Treatments Limited
Bradford, West Yorkshire BD12 0JZ (GB)

(72) Inventors:
  • SONG, Zhiqiang
    Newtown, CT 06470 (US)
  • FORD, Philip, Anson
    Suffolk, VA 23433 (US)
  • ROY, Vincent, F.
    St-Augustin de Desmaures, QC G3A 2N9 (CA)
  • GRIMSLEY, Swindell, Allen
    Chesapeake, VA 23321 (US)
  • SATCHER, Kenneth, W.
    Southaven, MS 38671 (US)
  • BLAZEY, Matthew
    Suffolk, VA 23434 (US)
  • PELBOIS, Robert
    Quebec City, QC G1H 7C1 (CA)

   


(54) AMPHOTERIC POLYMERS FOR CONTROLLING DEPOSITION OF PITCHES AND STICKIES IN PAPERMAKING