Compositions – Water-softening or purifying or scale-inhibiting agents – Plant or organic material containing
Patent
1992-11-03
1995-02-07
Kalafut, Stephen
Compositions
Water-softening or purifying or scale-inhibiting agents
Plant or organic material containing
252175, 252 80, 210727, C02F 510
Patent
active
053873653
ABSTRACT:
Metal scavengers suitable for use in the treatment of waste water are disclosed. The metal scavengers individually comprise a polyamine derivative and a polyethyleneimine derivative. The polyamine derivative is formed of a polyamine having a molecular weight not higher than 500 and contains, per molecule of the polyamine, at least one dithiocarboxyl group or a salt thereof as an N-substituting group substituted for an active hydrogen atom of the polyamine such that at least 30% of suitable active hydrogen atoms contained in the polyamine are substituted by the dithiocarboxyl group or salt thereof. The polyethyleneimine derivative is formed from a polyethyleneimine having an average molecular weight of at least 5,000 and contains, per molecule of the polyethyleneimine, at least one dithiocarboxyl group or a salt thereof as an N-substituting group substituted for an active hydrogen atom of the polyethyleneimine such that at least 40% of substitutable active hydrogen atoms contained in the polyethyleneimine are substituted by the dicarboxyl group or a salt thereof. The mixing ratio of the polyamine derivative to the polyethyleneimine derivative is about 9-7:1-3 by weight.
REFERENCES:
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patent: 4578195 (1986-03-01), Moore et al.
patent: 4731187 (1988-03-01), Moriya et al.
patent: 5130051 (1992-07-01), Falk
Hosoda Kazuo
Moriya Masafumi
Tsukanome Masayoshi
Yoshida Masatoshi
Kalafut Stephen
Miyoshi Yushi Kabushiki Kaisha
Silbermann J.
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