Process for controlling pitch deposition from pulp in papermakin

Details Process for controlling pitch deposition from pulp in papermakin Process for controlling pitch deposition from pulp in papermakin

1988-06-07

1989-10-03

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621682, 1621683, 162199, 162DIG4, D21H 344

Patent

active

048714240

ABSTRACT:
The invention relates to a process for controlling pitch deposition from pulp in papermaking systems which comprises adding to the pulp an effective amount of a polymer having hydroxyl groups pendant to the backbone of the polymer. The polymer can be polyvinyl alcohol having 50% to 100% hydrolysis. The polymer can also be a water-soluble copolymer having recurring units of nonionic hydrophilic monomers, and/or hydrophobic monomers, wherein the copolymer has at least 20 mol percent of vinyl alcohol. In another aspect, this invention comprises adding to the pulp an effective amount of a water-soluble polymer derived by substituting hydroxyl groups onto a preformed reactive polymer, wherein the water-soluble polymer has at least 20 mol percent of hydroxyl groups.

REFERENCES:
patent: 3873417 (1975-03-01), Otrhalek et al.
patent: 3920508 (1975-11-01), Yonemori
patent: 3920509 (1975-11-01), Yonemori
patent: 4608123 (1986-08-01), Leahy
patent: 4744865 (1988-05-01), Dreisbach et al.

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