초록 ▼

A dry, solid, water-swellable absorbent composition of matter is prepared by blending together (a) a water-insoluble absorbent polymer and (b) from 1 to 75%, by weight of the blend, of an extender material selected from uncrosslinked cellulose derivatives, starch, certain clays and minerals, or mixt

A dry, solid, water-swellable absorbent composition of matter is prepared by blending together (a) a water-insoluble absorbent polymer and (b) from 1 to 75%, by weight of the blend, of an extender material selected from uncrosslinked cellulose derivatives, starch, certain clays and minerals, or mixtures thereof. The composition is characterized by having an absorbency exceeding the sum of the absorbencies, calculated proportionately, of the individual components. In one preferred embodiment, the absorbent polymer is a water-swellable ionic complex of a water-soluble anionic polyelectrolyte and a polyvalent metal cation having a valence of at least three.

대표청구항 ▼

A dry, solid, water-swellable absorbent/extender blend, characterized by the improved absorbency of the blend, which comprises: (a) an ionically complexed anionic polyelectrolyte which is a water-insoluble ionic complex of a water-soluble anionic polyelectrolyte and a polyvalent metal cation having

A dry, solid, water-swellable absorbent/extender blend, characterized by the improved absorbency of the blend, which comprises: (a) an ionically complexed anionic polyelectrolyte which is a water-insoluble ionic complex of a water-soluble anionic polyelectrolyte and a polyvalent metal cation having a valence of at least three; and (b) from about 1-80%, by weight of the blend, of a cellulosic, starch, or inorganic extender, the cellulosic being selected from the group consisting of uncrosslinked sodium carboxymethyl cellulose, methyl cellulose, and hydroxyethyl cellulose; the starch extender being selected from the group consisting of native waxy maize starch, native corn starch, pregelatinized waxy maize starch, pregelatinized corn starch, drum-dried starch succinate, and drum-dried crosslinked hydroxypropyl starch; the inorganic extender being selected from the group consisting of attapulgite clay, sodium montmorillonite clay, seracite, talc, kaolin, diatomaceous silica, and amorphous silica; the absorbency exceeding the sum of the absorbencies, calculated proportionately, of the polyelectrolyte and the extender, when measured by blood-saline pressure retention at pressure of 1.0 psi. and wherein the improvement in the absorbency is at least about 7%.