Process for producing quality-improved water-absorbent polymers

Details Process for producing quality-improved water-absorbent polymers Process for producing quality-improved water-absorbent polymers

1990-02-20

1992-05-19

Bleutge, John C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524421, 524422, 524428, 524436, 524566, 524564, 524599, C08K 330

Patent

active

051150115

ABSTRACT:
This invention relates to a process for producing a quality-improved water-absorbent polymer in which the aqueous liquid (I), which is obtained by mixing in an aqueous medium at least one kind of a water-soluble salt (A) selected from a group of halogenated compounds, sulfates, acetates, and nitrates, which are derived from at least one kind of a polyvalent metal selected from a group of aluminum, calcium, and magnesium, with at least one kind of a water-soluble salt (B) selected from a group of monovalent metal salts and ammonium salts, which are derived from at least one kind of an oxyacid selected from a group of sulfurous acid and thiosulfuric acid, is mixed with a water-absorbent polymer (II) in a proportion of that the water-soluble salt of the polyvalent metal (A) is in a range of 0.1.about.10 parts by weight against 100 parts by weight of the water-absorbent polymer (II) and the water-soluble salt of the oxyacid (B) is in a range of 0. 1.about.10 parts by weight against 100 parts by weight of the water-absorbent polymer (II). The mixture which is obtained by mixing the aqueous liquid (I) with the water-absorbent polymer (II) has relatively-improved capacities in the fluidity and the amount of residual monomers. This invention displays a more sufficient effect by compulsorily bringing the mixture into contact with an oxygen-containing gas.

REFERENCES:
patent: 4043952 (1977-08-01), Ganslaw et al.
patent: 4043952 (1977-08-01), Ganslaw et al.
patent: 4295987 (1981-10-01), Parks
patent: 4587308 (1986-05-01), Makita et al.
patent: 4766173 (1988-08-01), Bailey et al.
patent: 4863989 (1989-09-01), Obayashi et al.
1991 American Chemical Society Article No. CA112(4):21436t.

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