Compositions – Water-softening or purifying or scale-inhibiting agents
Patent
1984-07-13
1986-07-08
Willis, Prince E.
Compositions
Water-softening or purifying or scale-inhibiting agents
25217421, 25217423, 252DIG1, 252DIG2, C11D 172, D21C 502
Patent
active
045991901
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.
REFERENCES:
patent: 3021372 (1962-02-01), Dupre et al.
patent: 4043908 (1977-08-01), Roberts et al.
patent: 4162186 (1979-07-01), Wood et al.
patent: 4184912 (1980-01-01), Payton
patent: 4347099 (1982-08-01), DeCeuster et al.
patent: 4445971 (1984-05-01), Lappi et al.
U.S. patent application Ser. No. 458,432, (filed Jan. 17, 1983).
The "Condensed Chemical Dictionary", G. G. Hawley, ed. (p. 858).
Diamond Shamrock Chemicals Company
Willis Prince E.
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