Compositions – Physical separation agents
Patent
1991-09-16
1993-11-09
Pal, Asok
Compositions
Physical separation agents
252162, 162 5, C09K 300
Patent
active
052599698
ABSTRACT:
Deinking of impact and nonimpact printed paper is accomplished by repulping and defibering the printed paper in an alkali aqueous medium containing a deinking chemical to form an ink pulp medium. The presence of the deinking chemical causes separation of ink particles from the printed paper fibers. Removal of the ink particles from the ink pulp medium is accomplished by screening, flotation, forward cleaning, reverse cleaning, washing and mechanical dispersion procedures to produce a substantially ink free pulp medium. This substantially ink free pulp medium has a speck removal and brightness level sufficient to produce a high-grade recyclable grade paper product. The invention provides a deinking composition comprised of a mixture of one or more solvents, and nonionic and anionic surfactants, capable of high ink removal from all types of impact and nonimpact printed paper.
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Kerstanski Dennis J.
Srivatsa Narendra R.
Wesolowski Richard R.
Achutamurthy P.
International Paper Company
Pal Asok
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