Process for the control of pitch

Details Process for the control of pitch Process for the control of pitch

2011-07-05

2011-07-05

Hug, Eric (Department: 1741)

Paper making and fiber liberation

Processes and products

Conditioning, preparing or repairing of apparatus

C162S048000, C162S072000, C162S090000, C162S181200, C210S908000, C210S928000

Reexamination Certificate

active

07972479

ABSTRACT:
The present invention relates to a process for the control of pitch in an aqueous medium by adding surface-reacted natural calcium carbonate or an aqueous suspension comprising surface-reacted calcium carbonate and having a pH greater than 6.0 measured at 20° C., to the medium, wherein the surface-reacted calcium carbonate is a reaction product of natural calcium carbonate with carbon dioxide and one or more acids, the use of the surface-reacted natural calcium carbonate for pitch control, as well as to a combination of a surface-reacted natural calcium carbonate and talc for pitch control, and the resulting composites.

REFERENCES:
patent: 6210526 (2001-04-01), Pohlen
patent: 2004/0020410 (2004-02-01), Gane
patent: 2006/0048908 (2006-03-01), Wang et al.
patent: 0 989 229 (2000-03-01), None
patent: WO 2004/083316 (2004-09-01), None
The International Search Report for PCT Application No. PCT/EP2008/053335.
The Written Opinion of the International Searching Authority for PCT Application No. PCT/EP2008/053335.

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