Water soluble graft copolymers for laser print deinking loop cla

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste

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162 72, 162189, 162190, 210734, C02F 156

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053873181

ABSTRACT:
A method for clarifying the laser print deinking loop water in a papermaking process by using a water soluble graft copolymer having the structure: ##STR1## wherein E is the repeat unit obtained after polymerization of an .alpha.,.beta. ethylenically unsaturated compound, the molar percentage of a:b is from about 95:5 to 5:95, with the proviso that the sum of a and b equals 100%; G comprises the structure: ##STR2## wherein d is a cationic monomer, R.sub.1, R.sub.2 and R.sub.3 are the same or different and are hydrogen or a lower alkyl group having C.sub.1 to C.sub.3, F is the salt of an ammonium cation and the molar percentage of c:d is from 95:5 to 5:95 with the proviso that the sum of c and d equals 100%.

REFERENCES:
patent: 5013456 (1991-05-01), St. John
patent: 5211854 (1993-05-01), Liao et al.
patent: 5266166 (1993-11-01), Dreisbach
patent: 5269942 (1993-12-01), Harrington
Pulp & Paper Chemistry & Chemical Technology, 3d ed., vol. III, 1981, pp. 1593-1607.
Betz Handbook of Industrial Water Conditioning, 9th ed., 1991, pp. 22-30.

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