Removal of laser printer and xerographic ink from recycle paper

Details Removal of laser printer and xerographic ink from recycle paper Removal of laser printer and xerographic ink from recycle paper

1992-04-23

1993-06-08

Hastings, Karen M.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 55, D21C 502

Patent

active

052175731

ABSTRACT:
A method for removing laser printer and xerographic toner, ink or the like from paper to be recycled comprising pulping the paper to be recycled with water to produce a paper pulp slurry with a consistency of between about 1% and 20%, adjusting the pH of the slurry to between about 6 and about 13, adding between about 0.3 and about 5.0 wt. %, based on the dry weight of the paper, of a surfactant to the slurry, the surfactant having the formula R.sup.1 --R.sup.2 --R.sup.3, wherein R.sup.1 and R.sup.3 are each selected from the group consisting of rosins, rosin dimers and mixtures of rosins and rosin dimers and R.sup.2 is a polyethylene glycol (PEG) having a molecular weight of between about 220 and about 660 Da, and adding between about 0.01 and about 5.0 wt. % of polyacrylic acid to the slurry, maintaining the slurry at a temperature of between about 30.degree. C. and about 120.degree. C. for a period of between about 5 minutes and about 90 minutes, and removing the ink from fibers of the paper as agglomerated particles, the particles having diameters of between about 1 mm and about 3 mm.

REFERENCES:
patent: 3392083 (1968-07-01), Illingworth
patent: 4276118 (1981-06-01), Quick
patent: 4483742 (1984-11-01), Bridle
patent: 4562933 (1985-12-01), Wood
patent: 4643800 (1987-02-01), Maloney et al.
patent: 4820379 (1989-04-01), Darlington
patent: 4964949 (1990-10-01), Hamaguchi et al.
Chemical Abstracts 233484r-based on Japan 63/303190 Dec. 1988.

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