Pitch control composition

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With cleaning – preserving or conditioning of apparatus

Reexamination Certificate

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C162S178000, C162S199000, C162SDIG004, C252S180000

Reexamination Certificate



This invention relates to a liquid composition for the control of pitch deposition in pulp and paper making comprising an aqueous solution of (1) a cationic guar polymer, and (2) isobutylene/maleic anhydride copolymer. The invention also relates to a process for inhibiting pitch and stickies deposition in pulp and papermaking systems.

patent: 3992249 (1976-11-01), Farley
patent: 4755259 (1988-07-01), Larsson
patent: 4946557 (1990-08-01), Svending
patent: 5246548 (1993-09-01), Aston et al.
patent: 5292403 (1994-03-01), Dreisbach et al.
patent: 5300194 (1994-04-01), Welkener et al.
patent: 55-84491 (1980-06-01), None
Louche et al, “The Role of Special Polyelectrolytes for the Solution of Operating Problems in Paper and Paper Board Production”,Product Information, Buckman Laboratories, S.A. p. 1-25.


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