| (19) |
 |
|
(11) |
EP 0 760 406 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
17.09.1997 Bulletin 1997/38 |
| (43) |
Date of publication A2: |
|
05.03.1997 Bulletin 1997/10 |
| (22) |
Date of filing: 04.06.1996 |
|
| (51) |
International Patent Classification (IPC)6: D21H 21/02 |
|
| (84) |
Designated Contracting States: |
|
CH DE FI FR GB LI SE |
| (30) |
Priority: |
24.08.1995 US 518954
|
| (71) |
Applicant: NALCO CANADA, INC. |
|
Burlington,
Ontario L7R 3Y9 (CA) |
|
| (72) |
Inventors: |
|
- Pruszynski, Przemyslaw
Burlington,
Ontario, L7M 3E3 (CA)
- Armstrong, John R.
Burlington,
Ontario, L8W 2N6 (CA)
- Chan, Alexander
Scarborough,
Ontario, M1V 4L2 (CA)
|
| (74) |
Representative: Harrison, David Christopher et al |
|
MEWBURN ELLIS
York House
23 Kingsway
London WC2B 6HP
London WC2B 6HP (GB) |
|
| |
|
| (54) |
Combination of poly (dadmac/acrylamide) and bentonite for deposition control in papermaking
processes |
(57) A method for minimizing pitch, ink, and stickies particle deposits in the papermaking
process by causing the retention of such particles onto fiber, comprising the steps
of adding an effective pitch, ink, and stickies controlling amount of a water soluble
diallyldimethyl ammonium chloride-acrylamide copolymer to a suspension of fiber in
contact with the paper machine and associated parts and adding an effective pitch,
ink, and stickies controlling amount of bentonite to the suspension, thereby increasing
retention of pitch, ink, and stickies onto the fiber and minimizing the deposition
of pitch, ink, and stickies particles on the paper machine and associated parts.