| 摘要 |
Improvements in washing methods of deinking secondary fiber wherein substituted oxyethylene glycol nonionic surfactants are employed in the aqueous deinking medium, the improvement being the addition to the deinking medium of water soluble, low molecular weight polyelectrolyte dispersants, preferably of the structure <IMAGE> wherein R1, R2, R4 and R5 are independent and can be hydrogen, C1-C4 lower alkyl, alkylcarboxy (e.g., -CH2COOH) or mixtures thereof; R3 and R6 can be hydrogen, carboxy, alkylcarboxy, or mixtures thereof, and X can be carboxy (including salts or derivatives thereof, e.g., amide), acetyl, or hydrocarbon moieties commonly attached to free radical polymerizable monomers (e.g., -C6H5 in styrene); a+b having a value in the range of 15 to about 1,000. Polymers comprising polyacrylates constitute a particularly preferred class of polyelectrolytes for use in the present improved method.
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