Patent ID: 6342124
Filing Date: 2002-01-29
Classification: D21C

Abstract:
A method of bleaching cellulose pulp, comprising bleaching an alkaline aqueous slurry of cellulose pulp with a bleaching agent in the presence of at least one bleaching assistant compound selected from the group consisting of at least one compound represented by formula (2) and at least one compound represented by formula (3):R2â€”Oâ€”{(C2C4O)m/(AO)p}â€”(AO)qâ€”Hâ€ƒâ€ƒ(2) (R3)tâ€”Xâ€”{(C2H4O)m/(AO)p}â€”(AO)râ€”Hâ€ƒâ€ƒ(3) where R2 is a branched alkyl group having 6 to 12 carbon atoms, m is an average added mol number of 4 to 15, A is a propylene, butylene or phenylethylene group, p is an average added mol number of 0 to 3.9, q is an average added mol number of 0.1 to 4 and the (C2H4O)m/(AO)p4, is in a random or block form, R3 is a branched alkyl group having 3 to 12 carbon atoms, t is an integer of 1 to 5, X is a residual phenol group, and r is an average added mol number of 0.1 to 4.