DEINKING AGENT CONTAINING ESTER OF ADDITION PRODUCT OF ALKYLENE OXIDE TO POLYHYDRIC ALCOHOL AND HAVING EFFECTS OF ENHANCING INK COLLECTION CAPACITY IN FLOTATION PROCESS AND OBTAINING HIGH QUALITY DEINKED PULP WITHOUT DECREASING PULP YIELD

摘要

PURPOSE: A deinking agent containing an ester of an addition product of an alkylene oxide to polyhydric alcohol is provided. It can enhance an ink collection capacity in a flotation process and produce high quality deinked pulp without decreasing a yield of the pulp. CONSTITUTION: The deinking agent contains a compound represented by the formula X-(O-(AO)m-R)n(Y) wherein a hydroxy value(OHV), saponification(SV) and acid value(AV) are in the range of OHV/(SV-AV+OHV) of 0 to 0.3. In formula, R is each H or C1-24 acyl wherein at least one is C8-24 acyl; A is C2-4 alkylene, a plurality of A can be mixed with another; mxn is equal to a valence and a number from 3 to 10. The deinking agent is prepared by esterifying the addition product of an alkylene oxide to polyhydric alcohol with carboxylic acid at 100 to 260 deg.C.