C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 233/35 (2006.01) C07D 233/22 (2006.01) D21C 5/02 (2006.01)
Patent
CA 2052116
-32- Case 150-5448 ABSTRACT A process for the de-inking of printed waste paper containing paper that is printed with ink containing hydrophilic binder resins (for example as in the flexographic process) comprising a) pulping the waste paper at a pH of 4 to 7 in the presence of an ink collector chemical containing a hydrophobic portion and being cati- onic and water-soluble or sparingly water-soluble at a pH from 4 to 7; b) applying to the resultant paper pulp a strong alkali to obtain a pH of 10-11; and c) separating the detached printing ink particles from the fibre suspension of the paper pulp by flotation. A cationic surfactant is preferably added at the same time as the ink collector chemical. The invention permits the de-inking of mixed paper printed with both hydrophilic and hydrophobic inks. 6300/TM/Gro (3.9.91)
Cowman John Stuart
Kirby Eades Gale Baker
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