A deinking agent containing a compound represented by the general formula (I): R1O-(PO)m-(EO)n-(XO)k-R2 wherein R1 represents C12-C22 alkyl or alkenyl; R2 represents hydrogen or C2-C24 acyl; PO, EO and XO represent, respectively, a propylene oxide unit, an ethylene oxide unit and a C3 or higher alkylene oxide unit; m is 1 to 8, n is 10 to 40 and k is such a number as to give polymerized XO units wherein the total number of the carbon atoms is 3 to 120; and wherein PO and EO form block addition copolymer chains. This agent is used for deinking waste paper particularly by flotation to give a high-quality regenerated pulp having a high whiteness and a reduced residual ink content and enable stabilized operation.
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机译：包含由通式（I）表示的化合物的脱墨剂：R 1 O-（PO）m-（EO）n-（XO）k R 2，其中R 1代表C12-C22烷基或烯基; R 2代表氢或C 2 -C 24酰基; PO，EO和XO分别代表环氧丙烷单元，环氧乙烷单元和C 3或更高的环氧烷单元; m为1〜8，n为10〜40，k为可得到X原子数为3〜120的聚合XO单元的数。其中PO和EO形成嵌段加成共聚物链。该试剂特别用于通过浮选使废纸脱墨，以得到具有高白度和减少的残余油墨含量的高质量再生纸浆，并能够稳定地操作。
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