D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 5/02 (2006.01)
Patent
CA 2235229
A deinking method for obtaining regenerated pulp of high brightness is provided. One or more of deinking agents selected from (a-1) to (a-2) given below are used, and a deinking step is carried out, in which a washing step is carried out at treating temperatures from 40 to 80°C; (a-1) : a compound represented by the general formula (a-1) given below, R1-O- (AO)P-H (a-1) where R1 is an alkyl group or an alkenyl group having 14 to 24 carbon atoms, AO is specific quantities of EO and PO, and p is a number to satisfy the specific quantities, (a-2): a compound represented by the general formula (a-2) given below, R2(-COO-(AO)m-R3]n (a-2) where n is an integer of one or more, R2 is a residue of carboxylic acid having 14 to 24 carbon atoms in total, R3 is hydrogen atom or an alkyl group having 1 to 20 carbon atoms and the like, AO is specific quantities of EO and PO, and m is a number to satisfy the specific quantities.
Ishibashi Yoichi
Sawai Minoru
Kao Corporation
Smart & Biggar
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