Composition for drinking secondary fibers
US4599190A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 1984 |
| Grant date | Jul 8, 1986 |
| Priority date | — |
| Expiry date | Jul 13, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/64
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Improvements in washing methods of deinking secondary fiber wherein substituted oxyethylene glycol nonionic surfactants are employed in the aqueous deinking medium, the improvement being the addition to the deinking medium of water soluble, low molecular weight polyelectrolyte dispersants, preferably of the structure ##STR1## wherein R.sub.1, R.sub.2, R.sub.4 and R.sub.5 are independent and can be hydrogen, C.sub.1 -C.sub.4 lower alkyl, alkylcarboxy (e.g., --CH.sub.2 COOH) or mixtures thereof; R.sub.3 and R.sub.6 can be hydrogen, carboxy, alkylcarboxy, or mixtures thereof, and X can be carboxy (including salts or derivatives thereof, e.g., amide), acetyl, or hydrocarbon moieties commonly attached to free radical polymerizable monomers (e.g., --C.sub.6 H.sub.5 in styrene); a+b having a value in the range of 15 to about 1,000. Polymers comprising polyacrylates constitute a particularly preferred class of polyelectrolytes for use in the present improved method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.