| 摘要 |
Describes a deinking agent composition and a method for deinking wastepaper printed with electrostatic ink or mixtures thereof with wastepaper printed with impact ink in which a combination of nonionic surfactants are added to an alkaline slurry of paper fibers. The surfactants are a first nonionic surfactant represented by the formula: R-Ph-(OC2H4)m-(OC3H6)n-(OC4H8)p-R1 and a second nonionic surfactant represented by R5-C6H4O-(C2H4O)t-H, block copolymers of ethylene oxide and propylene oxide or mixtures of such second nonionic surfactants. R is an aliphatic hydrocarbon group containing from 8 to 10 carbon atoms, Ph is phenylene, R1 is chloro or phenoxy, R5 is C8-C13 alkyl, the sum of m, n, and p is a number between 1 and 10, and t is a number between 1 and 9. The deinking agent composition also contains optional nonpolar solvent(s). The ratio of first to second nonionic surfactants is selected and adjusted to provide enhanced agglomeration of electrostatic ink.
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