Importance

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Abstract

This invention related to a process for the deinking of a mixture of xerographically printed wastepaper stocks and ledger printed wastepaper stocks which comprises: a) converting the wastepaper to a pulp, b) contacting the pulp with an aqueous medium of alkaline pH containing between about 0.05 and about 2 percent by weight, calculated on a dry weight basis of the pulp, of a deinking agent comprising a first component comprising at least one ethylene oxide adduct of a detergent-range alcohol having in the range of from about 8 to about 20 carbon atoms and an average of from about 3 to about 20 oxyethylene units per molecule of alcohol, a second component selected from the group consisting of one or more detergent-range olefins having from about 8 to about 22 carbon atoms, one or more saturated hydrocarbons having from about 8 to about 20 carbon atoms, and mixtures thereof, and a third component comprising a detergent-range alcohol component having from about 8 to about 20 carbon atoms, and c) treating the resulting pulp-containing medium by washing or flotation to remove suspended ink therefrom.

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First Claim