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Abstract

An aqueous alkaline slurry of cellulose pulp is bleached with oxygen or peroxide by using a compound represented by general formula (1), (2) or (3) as a bleaching assistant: R.sup.1 --O--[(C.sub.2 H.sub.4 O).sub.m /(AO).sub.n ]--H (1) R.sup.2 --O--[(C.sub.2 H.sub.4 O).sub.m /(AO).sub.p ]--(AO).sub.q --H (2) (R.sup.3).sub.t --X--[(C.sub.2 H.sub.4 O).sub.m /(AO).sub.p ]--(AO).sub.r --H (3) where R.sup.1 stands for a branched alkyl group having 6 to 12 carbon atoms, m stands for an average added mol number of 4 to 15, A stands for a propylene, butylene or phenylethylene group, n stands for an average added mol number of 0 to 4, the addition shown in [ ] is in a random or block form, R.sup.2 stands for a linear or branched alkyl group having 6 to 12 carbon atoms, p stands for an average added mol number of 0 to 3.9, q stands for an average added mol number of 0.1 to 4, R.sup.3 stands for a hydrogen atom, a methyl or ethyl group, or a branched alkyl group having 3 to 12 carbon atoms, t stands for an integer of 1 to 5, X stands for a residual phenol group, and r stands for an average added mol number of from 0 to 4.

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