DEINKING AGENT AND METHOD OF DEINKING THROUGH FLOTATION USING THE DEINKING AGENT

摘要

A deinking agent comprising a compound represented by thefollowing general formula I is herein provided:R1O -(PO)m -(EO)n - (XO)k - R2 (I)(wherein R1 represents an alkyl or alkenyl group having 12 to 22carbon atoms; R2 represents a hydrogen atom or an acyl grouphaving 2 to 24 carbon atoms; PO, EO and XO represent a propyleneoxide unit, an ethylene oxide unit and an alkylene oxide unithaving not less than 3 cabon atoms, respectively; m = 1~8; n =~40; and k is such a number that the number of total carbonatoms present in the polymerized XO unit ranges from 3 to 120;the PO and EO in Formula (I) being added through block-addition)~ The use of the deinking agent in the deinking methods, inparticular, the flotation method permits the preparation of highquality reclaimed pulp having high brightness and a low contentof residual ink and also ensures stable operations for themethods.